Surface Responses output_text logprobs on the text content

go.mod

@@ -7,8 +7,8 @@ require (
 	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.14.1
 	github.com/a2aproject/a2a-go/v2 v2.5.0
 	github.com/ag-ui-protocol/ag-ui/sdks/community/go v0.0.0-20260312103001-8e7ab1df34c8
-	github.com/anthropics/anthropic-sdk-go v1.72.0
-	github.com/github/copilot-sdk/go v1.0.13
+	github.com/anthropics/anthropic-sdk-go v1.73.0
+	github.com/github/copilot-sdk/go v1.0.14
 	github.com/gofrs/flock v0.13.1
 	github.com/google/jsonschema-go v0.4.3
 	github.com/google/uuid v1.6.0
@@ -22,12 +22,12 @@ require (
 	go.opentelemetry.io/otel/trace v1.46.0
 	golang.org/x/sync v0.23.0
 	google.golang.org/genai v1.71.0
-	google.golang.org/grpc v1.83.2
+	google.golang.org/grpc v1.84.0
 )
 
 require (
 	cloud.google.com/go v0.116.0 // indirect
-	cloud.google.com/go/auth v0.18.2 // indirect
+	cloud.google.com/go/auth v0.20.0 // indirect
 	cloud.google.com/go/compute/metadata v0.9.0 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.12.0 // indirect
 	github.com/AzureAD/microsoft-authentication-library-for-go v1.8.0 // indirect
@@ -36,14 +36,14 @@ require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/coder/websocket v1.8.15 // indirect
 	github.com/ebitengine/purego v0.10.1 // indirect
-	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/felixge/httpsnoop v1.1.0 // indirect
 	github.com/go-logr/logr v1.4.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang-jwt/jwt/v5 v5.3.1 // indirect
 	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/google/s2a-go v0.1.9 // indirect
-	github.com/googleapis/enterprise-certificate-proxy v0.3.11 // indirect
-	github.com/googleapis/gax-go/v2 v2.17.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.15 // indirect
+	github.com/googleapis/gax-go/v2 v2.22.0 // indirect
 	github.com/gorilla/websocket v1.5.3 // indirect
 	github.com/invopop/jsonschema v0.14.0 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
@@ -59,7 +59,7 @@ require (
 	github.com/tidwall/sjson v1.2.5 // indirect
 	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.61.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.69.0 // indirect
 	go.yaml.in/yaml/v4 v4.0.0-rc.2 // indirect
 	golang.org/x/crypto v0.55.0 // indirect
 	golang.org/x/mod v0.38.0 // indirect
@@ -68,7 +68,8 @@ require (
 	golang.org/x/sys v0.47.0 // indirect
 	golang.org/x/text v0.41.0 // indirect
 	golang.org/x/time v0.15.0 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20260526163538-3dc84a4a5aaa // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa // indirect
+	google.golang.org/api v0.278.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20260706201446-f0a921348800 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260706201446-f0a921348800 // indirect
 	google.golang.org/protobuf v1.36.11 // indirect
 )

go.sum

@@ -1,7 +1,7 @@
 cloud.google.com/go v0.116.0 h1:B3fRrSDkLRt5qSHWe40ERJvhvnQwdZiHu0bJOpldweE=
 cloud.google.com/go v0.116.0/go.mod h1:cEPSRWPzZEswwdr9BxE6ChEn01dWlTaF05LiC2Xs70U=
-cloud.google.com/go/auth v0.18.2 h1:+Nbt5Ev0xEqxlNjd6c+yYUeosQ5TtEUaNcN/3FozlaM=
-cloud.google.com/go/auth v0.18.2/go.mod h1:xD+oY7gcahcu7G2SG2DsBerfFxgPAJz17zz2joOFF3M=
+cloud.google.com/go/auth v0.20.0 h1:kXTssoVb4azsVDoUiF8KvxAqrsQcQtB53DcSgta74CA=
+cloud.google.com/go/auth v0.20.0/go.mod h1:942/yi/itH1SsmpyrbnTMDgGfdy2BUqIKyd0cyYLc5Q=
 cloud.google.com/go/compute/metadata v0.9.0 h1:pDUj4QMoPejqq20dK0Pg2N4yG9zIkYGdBtwLoEkH9Zs=
 cloud.google.com/go/compute/metadata v0.9.0/go.mod h1:E0bWwX5wTnLPedCKqk3pJmVgCBSM6qQI1yTBdEb3C10=
 github.com/Azure/azure-sdk-for-go/sdk/azcore v1.23.1 h1:zvXfGJCWvywnCA814d8ZiVyt+fm9nnTE8xSb99zRyfo=
@@ -20,8 +20,8 @@ github.com/a2aproject/a2a-go/v2 v2.5.0 h1:ZdcFoxv+nZTUV0i2ue5hES76YCANFPG9vjqd7v
 github.com/a2aproject/a2a-go/v2 v2.5.0/go.mod h1:NcRp/ZHxgMzDj12/BteIC2gOjljuEBKaGRfEdJ2lNSI=
 github.com/ag-ui-protocol/ag-ui/sdks/community/go v0.0.0-20260312103001-8e7ab1df34c8 h1:gcgM2iVSJ+5v1Li2O2xBm8jdY9bIo0coZdOlXOd0uLU=
 github.com/ag-ui-protocol/ag-ui/sdks/community/go v0.0.0-20260312103001-8e7ab1df34c8/go.mod h1:ERAMOexUee4AIuoxksuuGoEcHl3aqLwaazjGwlR9ZCI=
-github.com/anthropics/anthropic-sdk-go v1.72.0 h1:T0qQWWfygiL24lqEQaffRXCvEeno3yiv/mFzUdY1E88=
-github.com/anthropics/anthropic-sdk-go v1.72.0/go.mod h1:x+lPk/cCl48uRegeP0hlYYBN1b7bEBTveInIMgLicnY=
+github.com/anthropics/anthropic-sdk-go v1.73.0 h1:brLt0oVV6LH0YcG6O6G3pBnIVDJQ/QPoXul+OJHXEFc=
+github.com/anthropics/anthropic-sdk-go v1.73.0/go.mod h1:x+lPk/cCl48uRegeP0hlYYBN1b7bEBTveInIMgLicnY=
 github.com/bahlo/generic-list-go v0.2.0 h1:5sz/EEAK+ls5wF+NeqDpk5+iNdMDXrh3z3nPnH1Wvgk=
 github.com/bahlo/generic-list-go v0.2.0/go.mod h1:2KvAjgMlE5NNynlg/5iLrrCCZ2+5xWbdbCW3pNTGyYg=
 github.com/buger/jsonparser v1.1.2 h1:frqHqw7otoVbk5M8LlE/L7HTnIq2v9RX6EJ48i9AxJk=
@@ -36,10 +36,10 @@ github.com/dnaeon/go-vcr v1.2.0 h1:zHCHvJYTMh1N7xnV7zf1m1GPBF9Ad0Jk/whtQ1663qI=
 github.com/dnaeon/go-vcr v1.2.0/go.mod h1:R4UdLID7HZT3taECzJs4YgbbH6PIGXB6W/sc5OLb6RQ=
 github.com/ebitengine/purego v0.10.1 h1:dewVBCBT2GaMu1SrNTYxQhgQBethzfhiwvZiLGP/qyY=
 github.com/ebitengine/purego v0.10.1/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
-github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
-github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
-github.com/github/copilot-sdk/go v1.0.13 h1:sc4kLSJksYb6lsUwFV48P4jDJ06PQR+4OzpqOhvxho0=
-github.com/github/copilot-sdk/go v1.0.13/go.mod h1:U0STg9Jdv9LDwtkUtcUJCzPQ4KTnKakRfP+1LhEx248=
+github.com/felixge/httpsnoop v1.1.0 h1:3YtUj32ZZkqZtt3sZZsClsymw/QDuVfpNhoA31zeORc=
+github.com/felixge/httpsnoop v1.1.0/go.mod h1:Zqxgdd+1Rkcz8euOqdr7lqgCRJztwr5hp9vDSi5UZCE=
+github.com/github/copilot-sdk/go v1.0.14 h1:DeHPF2CbxRCe4EeAjYIo7v3CovGEEMHsrURUNaogf5A=
+github.com/github/copilot-sdk/go v1.0.14/go.mod h1:U0STg9Jdv9LDwtkUtcUJCzPQ4KTnKakRfP+1LhEx248=
 github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
 github.com/go-logr/logr v1.4.4 h1:tG4xh9yMsRCAiodLVTxyrkzSZ9+o0L1Kg/+cPVcbP/8=
 github.com/go-logr/logr v1.4.4/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
@@ -59,10 +59,10 @@ github.com/google/s2a-go v0.1.9 h1:LGD7gtMgezd8a/Xak7mEWL0PjoTQFvpRudN895yqKW0=
 github.com/google/s2a-go v0.1.9/go.mod h1:YA0Ei2ZQL3acow2O62kdp9UlnvMmU7kA6Eutn0dXayM=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/googleapis/enterprise-certificate-proxy v0.3.11 h1:vAe81Msw+8tKUxi2Dqh/NZMz7475yUvmRIkXr4oN2ao=
-github.com/googleapis/enterprise-certificate-proxy v0.3.11/go.mod h1:RFV7MUdlb7AgEq2v7FmMCfeSMCllAzWxFgRdusoGks8=
-github.com/googleapis/gax-go/v2 v2.17.0 h1:RksgfBpxqff0EZkDWYuz9q/uWsTVz+kf43LsZ1J6SMc=
-github.com/googleapis/gax-go/v2 v2.17.0/go.mod h1:mzaqghpQp4JDh3HvADwrat+6M3MOIDp5YKHhb9PAgDY=
+github.com/googleapis/enterprise-certificate-proxy v0.3.15 h1:xolVQTEXusUcAA5UgtyRLjelpFFHWlPQ4XfWGc7MBas=
+github.com/googleapis/enterprise-certificate-proxy v0.3.15/go.mod h1:vqVt9yG9480NtzREnTlmGSBmFrA+bzb0yl0TxoBQXOg=
+github.com/googleapis/gax-go/v2 v2.22.0 h1:PjIWBpgGIVKGoCXuiCoP64altEJCj3/Ei+kSU5vlZD4=
+github.com/googleapis/gax-go/v2 v2.22.0/go.mod h1:irWBbALSr0Sk3qlqb9SyJ1h68WjgeFuiOzI4Rqw5+aY=
 github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/invopop/jsonschema v0.14.0 h1:MHQqLhvpNUZfw+hM3AZDYK7jxO8FZoQeQM77g8iyZjg=
@@ -107,8 +107,8 @@ github.com/yosida95/uritemplate/v3 v3.0.2 h1:Ed3Oyj9yrmi9087+NczuL5BwkIc4wvTb5zI
 github.com/yosida95/uritemplate/v3 v3.0.2/go.mod h1:ILOh0sOhIJR3+L/8afwt/kE++YT040gmv5BQTMR2HP4=
 go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
 go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
-go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.61.0 h1:F7Jx+6hwnZ41NSFTO5q4LYDtJRXBf2PD0rNBkeB/lus=
-go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.61.0/go.mod h1:UHB22Z8QsdRDrnAtX4PntOl36ajSxcdUMt1sF7Y6E7Q=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.69.0 h1:8tvICD4vSTOOsNrsI4Ljf6C+6UKvpTEH5XY3JMoyPoo=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.69.0/go.mod h1:z9+yiacE0IHRqM4qFfkbt/JYlmYXgss8GY/jXoNuPJI=
 go.opentelemetry.io/otel v1.46.0 h1:FHt5/CDyVxi/8IM1CH7VE/rRgq3kLHa2mSTVMO8AWyc=
 go.opentelemetry.io/otel v1.46.0/go.mod h1:Gj3SEScelsNC45tp4nSxRYlS+f5iez7W8XPMCt905kE=
 go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.46.0 h1:KdRxPiAoMptR3vfWzvjjvutTsSiwbC2uG0496rzZNfo=
@@ -151,14 +151,18 @@ golang.org/x/tools v0.48.0 h1:3+hClM1aLL5mjMKm5ovokw9epgRXPuu2tILgismM6RE=
 golang.org/x/tools v0.48.0/go.mod h1:08xX0orndb/F7jJxGDicx061tyd5pcMto75YMAXr6lk=
 gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
 gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
+google.golang.org/api v0.278.0 h1:W7jiRvRi53VYFfZ/HoZjQBtJk7gOFbHD8ot1RzVZU6E=
+google.golang.org/api v0.278.0/go.mod h1:B9TqLBwJqVjp1mtt7WeoQwWRwvu/400y5lETOql+giQ=
 google.golang.org/genai v1.71.0 h1:Wfo9n0uSzMhZH7d+rP7QxxSWELEDSD4z6O8W/C9s3oM=
 google.golang.org/genai v1.71.0/go.mod h1:mDdPDFXo1Ats7f1WXVyZgWb/CkMzFWTWJruIMy7hGIU=
-google.golang.org/genproto/googleapis/api v0.0.0-20260526163538-3dc84a4a5aaa h1:Kjn0N0tCrDgiAFW+lGO4JZ3ck44CehvJQMAwj9QF0G8=
-google.golang.org/genproto/googleapis/api v0.0.0-20260526163538-3dc84a4a5aaa/go.mod h1:q4lMZS6kskjT5HvCPrnnypcDPVJqT/f4nfxmkE7gryY=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa h1:mZHHdPZl0dbGHCflZgAq/Q468DWVFcU2whhB2KAo8fk=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
-google.golang.org/grpc v1.83.2 h1:EManeRomTObA0BU7I8vXgg/78uE5MJ9M8B39EX2WscU=
-google.golang.org/grpc v1.83.2/go.mod h1:YPI1hK3kDked6iHvgX3tR0y+nX/qpMFKhPgFsokw1S8=
+google.golang.org/genproto v0.0.0-20260319201613-d00831a3d3e7 h1:XzmzkmB14QhVhgnawEVsOn6OFsnpyxNPRY9QV01dNB0=
+google.golang.org/genproto v0.0.0-20260319201613-d00831a3d3e7/go.mod h1:L43LFes82YgSonw6iTXTxXUX1OlULt4AQtkik4ULL/I=
+google.golang.org/genproto/googleapis/api v0.0.0-20260706201446-f0a921348800 h1:admdQBe8jR3VWhBsUrAOaF2Qw6K/+p5pSm1GN8+6Fw4=
+google.golang.org/genproto/googleapis/api v0.0.0-20260706201446-f0a921348800/go.mod h1:FPk7EXUKMtImne7AmknoYjT4QXqKIzzRbeQIXzLk6fQ=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260706201446-f0a921348800 h1:qEHAMpSaUhtD0p3NbEEI83HwNGFxEwaSJ1G9PLnCBZE=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260706201446-f0a921348800/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
+google.golang.org/grpc v1.84.0 h1:soMyaPJ8pAak5PIQ0DGBUir0XRo2fRoMqhNWMLlLxO0=
+google.golang.org/grpc v1.84.0/go.mod h1:ljCht0DrxQrXBDRTZp52Qxh3Ffk8CdYm2sj4O2QN2C0=
 google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
 google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

provider/openaiprovider/responses.go

@@ -1120,6 +1120,9 @@ func responsesProcessResponse(resp *responses.Response, seqNum int64, yield func
 				case responses.ResponseOutputText:
 					textContent := &message.TextContent{Text: c.Text}
 					populateAnnotations(c.Annotations, textContent)
+					if len(c.Logprobs) > 0 {
+						textContent.AdditionalProperties = map[string]any{"Logprobs": c.Logprobs}
+					}
 					currentUpdate.Contents = append(currentUpdate.Contents, textContent)
 				case responses.ResponseOutputRefusal:
 					currentUpdate.Contents = append(currentUpdate.Contents, &message.ErrorContent{
@@ -1582,24 +1585,27 @@ func responsesProcessStreamingUpdate(update responses.ResponseStreamEventUnion,
 			u.Role = state.role
 			// For messages, only emit content if there are annotations that weren't in delta events
 			// Delta events handle the text itself, but annotations only appear in done events
-			hasAnnotations := false
+			hasMetadata := false
 			for _, c := range item.Content {
-				if c, ok := c.AsAny().(responses.ResponseOutputText); ok && len(c.Annotations) > 0 {
-					hasAnnotations = true
+				if c, ok := c.AsAny().(responses.ResponseOutputText); ok && (len(c.Annotations) > 0 || len(c.Logprobs) > 0) {
+					hasMetadata = true
 					break
 				}
 			}
 
-			if hasAnnotations {
+			if hasMetadata {
 				annotatedContent := &message.TextContent{}
 				for _, c := range item.Content {
 					if outputText, ok := c.AsAny().(responses.ResponseOutputText); ok {
 						populateAnnotations(outputText.Annotations, annotatedContent)
+						if len(outputText.Logprobs) > 0 {
+							annotatedContent.AdditionalProperties = map[string]any{"Logprobs": outputText.Logprobs}
+						}
 					}
 				}
 				u.Contents = []message.Content{annotatedContent}
 			}
-			// If no annotations, don't emit content (delta events already did)
+			// If no annotations or logprobs, don't emit content (delta events already did)
 
 		case responses.ResponseFunctionToolCall:
 			state.anyFunctions = true

provider/openaiprovider/responses_test.go

@@ -153,6 +153,82 @@ func TestResponsesRequestIncludesAgentFrameworkUserAgent(t *testing.T) {
 	}
 }
 
+// output_text logprobs must be surfaced on the TextContent's
+// AdditionalProperties, matching the Python client which stores them there.
+func TestResponsesOutputTextLogprobsSurfaced_NonStreaming(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = io.WriteString(w, `{
+			"id":"resp_lp",
+			"object":"response",
+			"created_at":1741891428,
+			"status":"completed",
+			"error":null,
+			"incomplete_details":null,
+			"model":"gpt-4o-mini",
+			"output":[{"type":"message","id":"msg_lp","status":"completed","role":"assistant","content":[{"type":"output_text","text":"hello","annotations":[],"logprobs":[{"token":"hello","logprob":-0.05,"bytes":[104,101,108,108,111],"top_logprobs":[]}]}]}]
+		}`)
+	}))
+	defer server.Close()
+
+	resp, err := newTestResponsesClient(server, "gpt-4o-mini").RunText(t.Context(), "hi").Collect()
+	if err != nil {
+		t.Fatalf("error = %v", err)
+	}
+
+	var text *message.TextContent
+	for content := range resp.Contents() {
+		if tc, ok := content.(*message.TextContent); ok {
+			text = tc
+		}
+	}
+	if text == nil {
+		t.Fatalf("no TextContent in response")
+	}
+	if _, ok := text.AdditionalProperties["Logprobs"]; !ok {
+		t.Errorf("Logprobs missing from TextContent AdditionalProperties: %#v", text.AdditionalProperties)
+	}
+}
+
+// The streaming output_item.done path must also surface output_text logprobs on
+// the emitted text content.
+func TestResponsesOutputTextLogprobsSurfaced_Streaming(t *testing.T) {
+	const input = `{"model":"gpt-4o-mini","input":[{"type":"message","role":"user","content":[{"type":"input_text","text":"hi"}]}],"stream":true}`
+	const output = `event: response.created
+data: {"type":"response.created","sequence_number":0,"response":{"id":"resp_lp","object":"response","created_at":1741891428,"status":"in_progress","model":"gpt-4o-mini","output":[]}}
+
+event: response.output_text.delta
+data: {"type":"response.output_text.delta","sequence_number":1,"item_id":"msg_lp","output_index":0,"content_index":0,"delta":"hello"}
+
+event: response.output_item.done
+data: {"type":"response.output_item.done","sequence_number":2,"output_index":0,"item":{"type":"message","id":"msg_lp","status":"completed","role":"assistant","content":[{"type":"output_text","text":"hello","annotations":[],"logprobs":[{"token":"hello","logprob":-0.05,"bytes":[104],"top_logprobs":[]}]}]}}
+
+event: response.completed
+data: {"type":"response.completed","sequence_number":3,"response":{"id":"resp_lp","object":"response","created_at":1741891428,"status":"completed","model":"gpt-4o-mini","output":[]}}
+
+`
+
+	server := newTestResponsesServerStreaming(t, input, output)
+	defer server.Close()
+
+	var withLogprobs *message.TextContent
+	for update, err := range newTestResponsesClient(server, "gpt-4o-mini").RunText(t.Context(), "hi", agent.Stream(true)) {
+		if err != nil {
+			t.Fatalf("error = %v", err)
+		}
+		for _, content := range update.Contents {
+			if tc, ok := content.(*message.TextContent); ok {
+				if _, ok := tc.AdditionalProperties["Logprobs"]; ok {
+					withLogprobs = tc
+				}
+			}
+		}
+	}
+	if withLogprobs == nil {
+		t.Fatal("no streamed TextContent carried Logprobs from output_item.done")
+	}
+}
+
 func TestNewAgentCurrentlyUsesResponsesAPI(t *testing.T) {
 	const input = `
 			{