diff --git a/client/build.go b/client/build.go
index 25b3aa6d7ccf..106d36329108 100644
--- a/client/build.go
+++ b/client/build.go
@@ -113,6 +113,19 @@ func (g *gatewayClientForBuild) StatFile(ctx context.Context, in *gatewayapi.Sta
 	return g.gateway.StatFile(ctx, in, opts...)
 }
 
+func (g *gatewayClientForBuild) Evaluate(ctx context.Context, in *gatewayapi.EvaluateRequest, opts ...grpc.CallOption) (*gatewayapi.EvaluateResponse, error) {
+	if err := g.caps.Supports(gatewayapi.CapGatewayEvaluate); err != nil {
+		if err2 := g.caps.Supports(gatewayapi.CapStatFile); err2 != nil {
+			return nil, err
+		}
+		ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
+		_, err := g.gateway.StatFile(ctx, &gatewayapi.StatFileRequest{Ref: in.Ref, Path: "."}, opts...)
+		return &gatewayapi.EvaluateResponse{}, err
+	}
+	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
+	return g.gateway.Evaluate(ctx, in, opts...)
+}
+
 func (g *gatewayClientForBuild) Ping(ctx context.Context, in *gatewayapi.PingRequest, opts ...grpc.CallOption) (*gatewayapi.PongResponse, error) {
 	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
 	return g.gateway.Ping(ctx, in, opts...)
diff --git a/control/gateway/gateway.go b/control/gateway/gateway.go
index 62c696d6c448..4451e022d322 100644
--- a/control/gateway/gateway.go
+++ b/control/gateway/gateway.go
@@ -111,6 +111,14 @@ func (gwf *GatewayForwarder) ReadFile(ctx context.Context, req *gwapi.ReadFileRe
 	return fwd.ReadFile(ctx, req)
 }
 
+func (gwf *GatewayForwarder) Evaluate(ctx context.Context, req *gwapi.EvaluateRequest) (*gwapi.EvaluateResponse, error) {
+	fwd, err := gwf.lookupForwarder(ctx)
+	if err != nil {
+		return nil, errors.Wrap(err, "forwarding Evaluate")
+	}
+	return fwd.Evaluate(ctx, req)
+}
+
 func (gwf *GatewayForwarder) Ping(ctx context.Context, req *gwapi.PingRequest) (*gwapi.PongResponse, error) {
 	fwd, err := gwf.lookupForwarder(ctx)
 	if err != nil {
diff --git a/frontend/frontend_test.go b/frontend/frontend_test.go
index 907581f4f381..c2dc94f66823 100644
--- a/frontend/frontend_test.go
+++ b/frontend/frontend_test.go
@@ -31,6 +31,7 @@ func TestFrontendIntegration(t *testing.T) {
 		testRefReadFile,
 		testRefReadDir,
 		testRefStatFile,
+		testRefEvaluate,
 		testReturnNil,
 	))
 }
@@ -291,6 +292,55 @@ func testRefStatFile(t *testing.T, sb integration.Sandbox) {
 	require.NoError(t, err)
 }
 
+func testRefEvaluate(t *testing.T, sb integration.Sandbox) {
+	ctx := sb.Context()
+
+	c, err := client.New(ctx, sb.Address())
+	require.NoError(t, err)
+	defer c.Close()
+
+	frontend := func(ctx context.Context, c gateway.Client) (*gateway.Result, error) {
+		st := llb.Scratch().File(llb.Mkfile("/test", 0666, []byte{}))
+		def, err := st.Marshal(ctx)
+		if err != nil {
+			return nil, err
+		}
+		res, err := c.Solve(ctx, gateway.SolveRequest{
+			Definition: def.ToPB(),
+		})
+		if err != nil {
+			return nil, err
+		}
+		ref, err := res.SingleRef()
+		if err != nil {
+			return nil, err
+		}
+
+		st = llb.Scratch().File(llb.Mkfile("/test/dir-does-not-exist", 0666, []byte{}))
+		def, err = st.Marshal(ctx)
+		if err != nil {
+			return nil, err
+		}
+		res, err = c.Solve(ctx, gateway.SolveRequest{
+			Definition: def.ToPB(),
+		})
+		if err != nil {
+			return nil, err
+		}
+		ref2, err := res.SingleRef()
+		if err != nil {
+			return nil, err
+		}
+
+		require.NoError(t, ref.Evaluate(ctx))
+		require.Error(t, ref2.Evaluate(ctx))
+		return gateway.NewResult(), nil
+	}
+
+	_, err = c.Build(ctx, client.SolveOpt{}, "", frontend, nil)
+	require.NoError(t, err)
+}
+
 func tmpdir(t *testing.T, appliers ...fstest.Applier) (string, error) {
 	tmpdir := t.TempDir()
 	if err := fstest.Apply(appliers...).Apply(tmpdir); err != nil {
diff --git a/frontend/gateway/client/client.go b/frontend/gateway/client/client.go
index fe77522387e6..23e6a632d2ee 100644
--- a/frontend/gateway/client/client.go
+++ b/frontend/gateway/client/client.go
@@ -91,6 +91,7 @@ type ContainerProcess interface {
 
 type Reference interface {
 	ToState() (llb.State, error)
+	Evaluate(ctx context.Context) error
 	ReadFile(ctx context.Context, req ReadRequest) ([]byte, error)
 	StatFile(ctx context.Context, req StatRequest) (*fstypes.Stat, error)
 	ReadDir(ctx context.Context, req ReadDirRequest) ([]*fstypes.Stat, error)
diff --git a/frontend/gateway/forwarder/forward.go b/frontend/gateway/forwarder/forward.go
index e98bf6ed7973..d2e579a26f4c 100644
--- a/frontend/gateway/forwarder/forward.go
+++ b/frontend/gateway/forwarder/forward.go
@@ -318,6 +318,14 @@ func (r *ref) ToState() (st llb.State, err error) {
 	return llb.NewState(defop), nil
 }
 
+func (r *ref) Evaluate(ctx context.Context) error {
+	_, err := r.resultProxy.Result(ctx)
+	if err != nil {
+		return r.c.wrapSolveError(err)
+	}
+	return nil
+}
+
 func (r *ref) ReadFile(ctx context.Context, req client.ReadRequest) ([]byte, error) {
 	m, err := r.getMountable(ctx)
 	if err != nil {
diff --git a/frontend/gateway/gateway.go b/frontend/gateway/gateway.go
index 327fee6fb7cb..d02423890af9 100644
--- a/frontend/gateway/gateway.go
+++ b/frontend/gateway/gateway.go
@@ -754,15 +754,15 @@ func (lbf *llbBridgeForwarder) Solve(ctx context.Context, req *pb.SolveRequest)
 	return resp, nil
 }
 
-func (lbf *llbBridgeForwarder) getImmutableRef(ctx context.Context, id, path string) (cache.ImmutableRef, error) {
+func (lbf *llbBridgeForwarder) getImmutableRef(ctx context.Context, id string) (cache.ImmutableRef, error) {
 	lbf.mu.Lock()
 	ref, ok := lbf.refs[id]
 	lbf.mu.Unlock()
 	if !ok {
-		return nil, errors.Errorf("no such ref: %v", id)
+		return nil, errors.Errorf("no such ref: %s", id)
 	}
 	if ref == nil {
-		return nil, errors.Wrap(os.ErrNotExist, path)
+		return nil, errors.Errorf("empty ref: %s", id)
 	}
 
 	r, err := ref.Result(ctx)
@@ -781,7 +781,7 @@ func (lbf *llbBridgeForwarder) getImmutableRef(ctx context.Context, id, path str
 func (lbf *llbBridgeForwarder) ReadFile(ctx context.Context, req *pb.ReadFileRequest) (*pb.ReadFileResponse, error) {
 	ctx = tracing.ContextWithSpanFromContext(ctx, lbf.callCtx)
 
-	ref, err := lbf.getImmutableRef(ctx, req.Ref, req.FilePath)
+	ref, err := lbf.getImmutableRef(ctx, req.Ref)
 	if err != nil {
 		return nil, err
 	}
@@ -812,7 +812,7 @@ func (lbf *llbBridgeForwarder) ReadFile(ctx context.Context, req *pb.ReadFileReq
 func (lbf *llbBridgeForwarder) ReadDir(ctx context.Context, req *pb.ReadDirRequest) (*pb.ReadDirResponse, error) {
 	ctx = tracing.ContextWithSpanFromContext(ctx, lbf.callCtx)
 
-	ref, err := lbf.getImmutableRef(ctx, req.Ref, req.DirPath)
+	ref, err := lbf.getImmutableRef(ctx, req.Ref)
 	if err != nil {
 		return nil, err
 	}
@@ -836,7 +836,7 @@ func (lbf *llbBridgeForwarder) ReadDir(ctx context.Context, req *pb.ReadDirReque
 func (lbf *llbBridgeForwarder) StatFile(ctx context.Context, req *pb.StatFileRequest) (*pb.StatFileResponse, error) {
 	ctx = tracing.ContextWithSpanFromContext(ctx, lbf.callCtx)
 
-	ref, err := lbf.getImmutableRef(ctx, req.Ref, req.Path)
+	ref, err := lbf.getImmutableRef(ctx, req.Ref)
 	if err != nil {
 		return nil, err
 	}
@@ -852,6 +852,16 @@ func (lbf *llbBridgeForwarder) StatFile(ctx context.Context, req *pb.StatFileReq
 	return &pb.StatFileResponse{Stat: st}, nil
 }
 
+func (lbf *llbBridgeForwarder) Evaluate(ctx context.Context, req *pb.EvaluateRequest) (*pb.EvaluateResponse, error) {
+	ctx = tracing.ContextWithSpanFromContext(ctx, lbf.callCtx)
+
+	_, err := lbf.getImmutableRef(ctx, req.Ref)
+	if err != nil {
+		return nil, err
+	}
+	return &pb.EvaluateResponse{}, nil
+}
+
 func (lbf *llbBridgeForwarder) Ping(context.Context, *pb.PingRequest) (*pb.PongResponse, error) {
 	workers := lbf.workers.WorkerInfos()
 	pbWorkers := make([]*apitypes.WorkerRecord, 0, len(workers))
diff --git a/frontend/gateway/grpcclient/client.go b/frontend/gateway/grpcclient/client.go
index 8a8c794a8465..7387e6fa4d3c 100644
--- a/frontend/gateway/grpcclient/client.go
+++ b/frontend/gateway/grpcclient/client.go
@@ -387,30 +387,15 @@ func (c *grpcClient) Solve(ctx context.Context, creq client.SolveRequest) (res *
 		if c.caps.Supports(pb.CapGatewayEvaluateSolve) == nil {
 			req.Evaluate = creq.Evaluate
 		} else {
-			// If evaluate is not supported, fallback to running Stat(".") in order to
-			// trigger an evaluation of the result.
+			// If evaluate is not supported, fallback to running Stat(".") in
+			// order to trigger an evaluation of the result.
 			defer func() {
 				if res == nil {
 					return
 				}
-
-				var (
-					id  string
-					ref client.Reference
-				)
-				ref, err = res.SingleRef()
-				if err != nil {
-					for refID := range res.Refs {
-						id = refID
-						break
-					}
-				} else {
-					id = ref.(*reference).id
-				}
-
-				_, err = c.client.StatFile(ctx, &pb.StatFileRequest{
-					Ref:  id,
-					Path: ".",
+				err = res.EachRef(func(ref client.Reference) error {
+					_, err := ref.StatFile(ctx, client.StatRequest{Path: "."})
+					return err
 				})
 			}()
 		}
@@ -1054,6 +1039,15 @@ func (r *reference) ToState() (st llb.State, err error) {
 	return llb.NewState(defop), nil
 }
 
+func (r *reference) Evaluate(ctx context.Context) error {
+	req := &pb.EvaluateRequest{Ref: r.id}
+	_, err := r.c.client.Evaluate(ctx, req)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
 func (r *reference) ReadFile(ctx context.Context, req client.ReadRequest) ([]byte, error) {
 	rfr := &pb.ReadFileRequest{FilePath: req.Filename, Ref: r.id}
 	if r := req.Range; r != nil {
diff --git a/frontend/gateway/pb/caps.go b/frontend/gateway/pb/caps.go
index 912ab88d22c3..deb192dc116e 100644
--- a/frontend/gateway/pb/caps.go
+++ b/frontend/gateway/pb/caps.go
@@ -56,6 +56,8 @@ const (
 	// errors.
 	CapGatewayEvaluateSolve apicaps.CapID = "gateway.solve.evaluate"
 
+	CapGatewayEvaluate apicaps.CapID = "gateway.evaluate"
+
 	// CapGatewayWarnings is the capability to log warnings from frontend
 	CapGatewayWarnings apicaps.CapID = "gateway.warnings"
 
@@ -198,6 +200,13 @@ func init() {
 		Status:  apicaps.CapStatusExperimental,
 	})
 
+	Caps.Init(apicaps.Cap{
+		ID:      CapGatewayEvaluate,
+		Name:    "gateway evaluate",
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
 	Caps.Init(apicaps.Cap{
 		ID:      CapGatewayWarnings,
 		Name:    "logging warnings",
diff --git a/frontend/gateway/pb/gateway.pb.go b/frontend/gateway/pb/gateway.pb.go
index 762ce2cfbf39..b1670622b94e 100644
--- a/frontend/gateway/pb/gateway.pb.go
+++ b/frontend/gateway/pb/gateway.pb.go
@@ -1471,6 +1471,92 @@ func (m *StatFileResponse) GetStat() *types.Stat {
 	return nil
 }
 
+type EvaluateRequest struct {
+	Ref                  string   `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *EvaluateRequest) Reset()         { *m = EvaluateRequest{} }
+func (m *EvaluateRequest) String() string { return proto.CompactTextString(m) }
+func (*EvaluateRequest) ProtoMessage()    {}
+func (*EvaluateRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f1a937782ebbded5, []int{23}
+}
+func (m *EvaluateRequest) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *EvaluateRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_EvaluateRequest.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *EvaluateRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_EvaluateRequest.Merge(m, src)
+}
+func (m *EvaluateRequest) XXX_Size() int {
+	return m.Size()
+}
+func (m *EvaluateRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_EvaluateRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_EvaluateRequest proto.InternalMessageInfo
+
+func (m *EvaluateRequest) GetRef() string {
+	if m != nil {
+		return m.Ref
+	}
+	return ""
+}
+
+type EvaluateResponse struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *EvaluateResponse) Reset()         { *m = EvaluateResponse{} }
+func (m *EvaluateResponse) String() string { return proto.CompactTextString(m) }
+func (*EvaluateResponse) ProtoMessage()    {}
+func (*EvaluateResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f1a937782ebbded5, []int{24}
+}
+func (m *EvaluateResponse) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *EvaluateResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_EvaluateResponse.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *EvaluateResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_EvaluateResponse.Merge(m, src)
+}
+func (m *EvaluateResponse) XXX_Size() int {
+	return m.Size()
+}
+func (m *EvaluateResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_EvaluateResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_EvaluateResponse proto.InternalMessageInfo
+
 type PingRequest struct {
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
@@ -1481,7 +1567,7 @@ func (m *PingRequest) Reset()         { *m = PingRequest{} }
 func (m *PingRequest) String() string { return proto.CompactTextString(m) }
 func (*PingRequest) ProtoMessage()    {}
 func (*PingRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{23}
+	return fileDescriptor_f1a937782ebbded5, []int{25}
 }
 func (m *PingRequest) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1523,7 +1609,7 @@ func (m *PongResponse) Reset()         { *m = PongResponse{} }
 func (m *PongResponse) String() string { return proto.CompactTextString(m) }
 func (*PongResponse) ProtoMessage()    {}
 func (*PongResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{24}
+	return fileDescriptor_f1a937782ebbded5, []int{26}
 }
 func (m *PongResponse) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1590,7 +1676,7 @@ func (m *WarnRequest) Reset()         { *m = WarnRequest{} }
 func (m *WarnRequest) String() string { return proto.CompactTextString(m) }
 func (*WarnRequest) ProtoMessage()    {}
 func (*WarnRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{25}
+	return fileDescriptor_f1a937782ebbded5, []int{27}
 }
 func (m *WarnRequest) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1671,7 +1757,7 @@ func (m *WarnResponse) Reset()         { *m = WarnResponse{} }
 func (m *WarnResponse) String() string { return proto.CompactTextString(m) }
 func (*WarnResponse) ProtoMessage()    {}
 func (*WarnResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{26}
+	return fileDescriptor_f1a937782ebbded5, []int{28}
 }
 func (m *WarnResponse) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1717,7 +1803,7 @@ func (m *NewContainerRequest) Reset()         { *m = NewContainerRequest{} }
 func (m *NewContainerRequest) String() string { return proto.CompactTextString(m) }
 func (*NewContainerRequest) ProtoMessage()    {}
 func (*NewContainerRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{27}
+	return fileDescriptor_f1a937782ebbded5, []int{29}
 }
 func (m *NewContainerRequest) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1798,7 +1884,7 @@ func (m *NewContainerResponse) Reset()         { *m = NewContainerResponse{} }
 func (m *NewContainerResponse) String() string { return proto.CompactTextString(m) }
 func (*NewContainerResponse) ProtoMessage()    {}
 func (*NewContainerResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{28}
+	return fileDescriptor_f1a937782ebbded5, []int{30}
 }
 func (m *NewContainerResponse) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1838,7 +1924,7 @@ func (m *ReleaseContainerRequest) Reset()         { *m = ReleaseContainerRequest
 func (m *ReleaseContainerRequest) String() string { return proto.CompactTextString(m) }
 func (*ReleaseContainerRequest) ProtoMessage()    {}
 func (*ReleaseContainerRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{29}
+	return fileDescriptor_f1a937782ebbded5, []int{31}
 }
 func (m *ReleaseContainerRequest) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1884,7 +1970,7 @@ func (m *ReleaseContainerResponse) Reset()         { *m = ReleaseContainerRespon
 func (m *ReleaseContainerResponse) String() string { return proto.CompactTextString(m) }
 func (*ReleaseContainerResponse) ProtoMessage()    {}
 func (*ReleaseContainerResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{30}
+	return fileDescriptor_f1a937782ebbded5, []int{32}
 }
 func (m *ReleaseContainerResponse) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1934,7 +2020,7 @@ func (m *ExecMessage) Reset()         { *m = ExecMessage{} }
 func (m *ExecMessage) String() string { return proto.CompactTextString(m) }
 func (*ExecMessage) ProtoMessage()    {}
 func (*ExecMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{31}
+	return fileDescriptor_f1a937782ebbded5, []int{33}
 }
 func (m *ExecMessage) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2090,7 +2176,7 @@ func (m *InitMessage) Reset()         { *m = InitMessage{} }
 func (m *InitMessage) String() string { return proto.CompactTextString(m) }
 func (*InitMessage) ProtoMessage()    {}
 func (*InitMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{32}
+	return fileDescriptor_f1a937782ebbded5, []int{34}
 }
 func (m *InitMessage) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2166,7 +2252,7 @@ func (m *ExitMessage) Reset()         { *m = ExitMessage{} }
 func (m *ExitMessage) String() string { return proto.CompactTextString(m) }
 func (*ExitMessage) ProtoMessage()    {}
 func (*ExitMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{33}
+	return fileDescriptor_f1a937782ebbded5, []int{35}
 }
 func (m *ExitMessage) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2219,7 +2305,7 @@ func (m *StartedMessage) Reset()         { *m = StartedMessage{} }
 func (m *StartedMessage) String() string { return proto.CompactTextString(m) }
 func (*StartedMessage) ProtoMessage()    {}
 func (*StartedMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{34}
+	return fileDescriptor_f1a937782ebbded5, []int{36}
 }
 func (m *StartedMessage) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2258,7 +2344,7 @@ func (m *DoneMessage) Reset()         { *m = DoneMessage{} }
 func (m *DoneMessage) String() string { return proto.CompactTextString(m) }
 func (*DoneMessage) ProtoMessage()    {}
 func (*DoneMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{35}
+	return fileDescriptor_f1a937782ebbded5, []int{37}
 }
 func (m *DoneMessage) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2300,7 +2386,7 @@ func (m *FdMessage) Reset()         { *m = FdMessage{} }
 func (m *FdMessage) String() string { return proto.CompactTextString(m) }
 func (*FdMessage) ProtoMessage()    {}
 func (*FdMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{36}
+	return fileDescriptor_f1a937782ebbded5, []int{38}
 }
 func (m *FdMessage) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2362,7 +2448,7 @@ func (m *ResizeMessage) Reset()         { *m = ResizeMessage{} }
 func (m *ResizeMessage) String() string { return proto.CompactTextString(m) }
 func (*ResizeMessage) ProtoMessage()    {}
 func (*ResizeMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{37}
+	return fileDescriptor_f1a937782ebbded5, []int{39}
 }
 func (m *ResizeMessage) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2418,7 +2504,7 @@ func (m *SignalMessage) Reset()         { *m = SignalMessage{} }
 func (m *SignalMessage) String() string { return proto.CompactTextString(m) }
 func (*SignalMessage) ProtoMessage()    {}
 func (*SignalMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_f1a937782ebbded5, []int{38}
+	return fileDescriptor_f1a937782ebbded5, []int{40}
 }
 func (m *SignalMessage) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -2488,6 +2574,8 @@ func init() {
 	proto.RegisterType((*ReadDirResponse)(nil), "moby.buildkit.v1.frontend.ReadDirResponse")
 	proto.RegisterType((*StatFileRequest)(nil), "moby.buildkit.v1.frontend.StatFileRequest")
 	proto.RegisterType((*StatFileResponse)(nil), "moby.buildkit.v1.frontend.StatFileResponse")
+	proto.RegisterType((*EvaluateRequest)(nil), "moby.buildkit.v1.frontend.EvaluateRequest")
+	proto.RegisterType((*EvaluateResponse)(nil), "moby.buildkit.v1.frontend.EvaluateResponse")
 	proto.RegisterType((*PingRequest)(nil), "moby.buildkit.v1.frontend.PingRequest")
 	proto.RegisterType((*PongResponse)(nil), "moby.buildkit.v1.frontend.PongResponse")
 	proto.RegisterType((*WarnRequest)(nil), "moby.buildkit.v1.frontend.WarnRequest")
@@ -2509,154 +2597,156 @@ func init() {
 func init() { proto.RegisterFile("gateway.proto", fileDescriptor_f1a937782ebbded5) }
 
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+	0x58, 0x65, 0x65, 0xfa, 0x1c, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -2681,6 +2771,8 @@ type LLBBridgeClient interface {
 	ReadDir(ctx context.Context, in *ReadDirRequest, opts ...grpc.CallOption) (*ReadDirResponse, error)
 	// apicaps:CapStatFile
 	StatFile(ctx context.Context, in *StatFileRequest, opts ...grpc.CallOption) (*StatFileResponse, error)
+	// apicaps:CapGatewayEvaluate
+	Evaluate(ctx context.Context, in *EvaluateRequest, opts ...grpc.CallOption) (*EvaluateResponse, error)
 	Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PongResponse, error)
 	Return(ctx context.Context, in *ReturnRequest, opts ...grpc.CallOption) (*ReturnResponse, error)
 	// apicaps:CapFrontendInputs
@@ -2745,6 +2837,15 @@ func (c *lLBBridgeClient) StatFile(ctx context.Context, in *StatFileRequest, opt
 	return out, nil
 }
 
+func (c *lLBBridgeClient) Evaluate(ctx context.Context, in *EvaluateRequest, opts ...grpc.CallOption) (*EvaluateResponse, error) {
+	out := new(EvaluateResponse)
+	err := c.cc.Invoke(ctx, "/moby.buildkit.v1.frontend.LLBBridge/Evaluate", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *lLBBridgeClient) Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PongResponse, error) {
 	out := new(PongResponse)
 	err := c.cc.Invoke(ctx, "/moby.buildkit.v1.frontend.LLBBridge/Ping", in, out, opts...)
@@ -2842,6 +2943,8 @@ type LLBBridgeServer interface {
 	ReadDir(context.Context, *ReadDirRequest) (*ReadDirResponse, error)
 	// apicaps:CapStatFile
 	StatFile(context.Context, *StatFileRequest) (*StatFileResponse, error)
+	// apicaps:CapGatewayEvaluate
+	Evaluate(context.Context, *EvaluateRequest) (*EvaluateResponse, error)
 	Ping(context.Context, *PingRequest) (*PongResponse, error)
 	Return(context.Context, *ReturnRequest) (*ReturnResponse, error)
 	// apicaps:CapFrontendInputs
@@ -2872,6 +2975,9 @@ func (*UnimplementedLLBBridgeServer) ReadDir(ctx context.Context, req *ReadDirRe
 func (*UnimplementedLLBBridgeServer) StatFile(ctx context.Context, req *StatFileRequest) (*StatFileResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method StatFile not implemented")
 }
+func (*UnimplementedLLBBridgeServer) Evaluate(ctx context.Context, req *EvaluateRequest) (*EvaluateResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Evaluate not implemented")
+}
 func (*UnimplementedLLBBridgeServer) Ping(ctx context.Context, req *PingRequest) (*PongResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Ping not implemented")
 }
@@ -2988,6 +3094,24 @@ func _LLBBridge_StatFile_Handler(srv interface{}, ctx context.Context, dec func(
 	return interceptor(ctx, in, info, handler)
 }
 
+func _LLBBridge_Evaluate_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(EvaluateRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(LLBBridgeServer).Evaluate(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/moby.buildkit.v1.frontend.LLBBridge/Evaluate",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(LLBBridgeServer).Evaluate(ctx, req.(*EvaluateRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _LLBBridge_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(PingRequest)
 	if err := dec(in); err != nil {
@@ -3146,6 +3270,10 @@ var _LLBBridge_serviceDesc = grpc.ServiceDesc{
 			MethodName: "StatFile",
 			Handler:    _LLBBridge_StatFile_Handler,
 		},
+		{
+			MethodName: "Evaluate",
+			Handler:    _LLBBridge_Evaluate_Handler,
+		},
 		{
 			MethodName: "Ping",
 			Handler:    _LLBBridge_Ping_Handler,
@@ -4458,6 +4586,67 @@ func (m *StatFileResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *EvaluateRequest) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *EvaluateRequest) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *EvaluateRequest) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.XXX_unrecognized != nil {
+		i -= len(m.XXX_unrecognized)
+		copy(dAtA[i:], m.XXX_unrecognized)
+	}
+	if len(m.Ref) > 0 {
+		i -= len(m.Ref)
+		copy(dAtA[i:], m.Ref)
+		i = encodeVarintGateway(dAtA, i, uint64(len(m.Ref)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *EvaluateResponse) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *EvaluateResponse) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *EvaluateResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.XXX_unrecognized != nil {
+		i -= len(m.XXX_unrecognized)
+		copy(dAtA[i:], m.XXX_unrecognized)
+	}
+	return len(dAtA) - i, nil
+}
+
 func (m *PingRequest) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -5940,6 +6129,34 @@ func (m *StatFileResponse) Size() (n int) {
 	return n
 }
 
+func (m *EvaluateRequest) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Ref)
+	if l > 0 {
+		n += 1 + l + sovGateway(uint64(l))
+	}
+	if m.XXX_unrecognized != nil {
+		n += len(m.XXX_unrecognized)
+	}
+	return n
+}
+
+func (m *EvaluateResponse) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if m.XXX_unrecognized != nil {
+		n += len(m.XXX_unrecognized)
+	}
+	return n
+}
+
 func (m *PingRequest) Size() (n int) {
 	if m == nil {
 		return 0
@@ -10065,6 +10282,140 @@ func (m *StatFileResponse) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *EvaluateRequest) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowGateway
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: EvaluateRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: EvaluateRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGateway
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGateway
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthGateway
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Ref = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipGateway(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthGateway
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.XXX_unrecognized = append(m.XXX_unrecognized, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *EvaluateResponse) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowGateway
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: EvaluateResponse: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: EvaluateResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		default:
+			iNdEx = preIndex
+			skippy, err := skipGateway(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthGateway
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.XXX_unrecognized = append(m.XXX_unrecognized, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func (m *PingRequest) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
diff --git a/frontend/gateway/pb/gateway.proto b/frontend/gateway/pb/gateway.proto
index 314fa94c09ca..d26058357c83 100644
--- a/frontend/gateway/pb/gateway.proto
+++ b/frontend/gateway/pb/gateway.proto
@@ -25,6 +25,8 @@ service LLBBridge {
 	rpc ReadDir(ReadDirRequest) returns (ReadDirResponse);
 	// apicaps:CapStatFile
 	rpc StatFile(StatFileRequest) returns (StatFileResponse);
+	// apicaps:CapGatewayEvaluate
+	rpc Evaluate(EvaluateRequest) returns (EvaluateResponse);
 	rpc Ping(PingRequest) returns (PongResponse);
 	rpc Return(ReturnRequest) returns (ReturnResponse);
 	// apicaps:CapFrontendInputs
@@ -195,6 +197,13 @@ message StatFileResponse {
 	fsutil.types.Stat stat = 1;
 }
 
+message EvaluateRequest {
+	string Ref = 1;
+}
+
+message EvaluateResponse {
+}
+
 message PingRequest{
 }
 message PongResponse{
diff --git a/solver/llbsolver/bridge.go b/solver/llbsolver/bridge.go
index d28fde356992..b0ec157b46ea 100644
--- a/solver/llbsolver/bridge.go
+++ b/solver/llbsolver/bridge.go
@@ -142,9 +142,6 @@ func (b *llbBridge) Solve(ctx context.Context, req frontend.SolveRequest, sid st
 
 	if req.Definition != nil && req.Definition.Def != nil {
 		res = &frontend.Result{Ref: newResultProxy(b, req)}
-		if req.Evaluate {
-			_, err = res.Ref.Result(ctx)
-		}
 	} else if req.Frontend != "" {
 		f, ok := b.frontends[req.Frontend]
 		if !ok {
@@ -157,6 +154,12 @@ func (b *llbBridge) Solve(ctx context.Context, req frontend.SolveRequest, sid st
 	} else {
 		return &frontend.Result{}, nil
 	}
+	if req.Evaluate {
+		err = res.EachRef(func(ref solver.ResultProxy) error {
+			_, err := res.Ref.Result(ctx)
+			return err
+		})
+	}
 
 	if len(res.Refs) > 0 {
 		for p := range res.Refs {