release: 4.55.0

[openai-sdks]

Automated Release PR

4.55.0 (2026-08-28)

Features

• api: add compute_units to Responses and Chat Completions usage (#944) (3e45ffb)
• auth: add X.509 token exchange (#940) (df0c88d)
• integrate X.509 workload identity with OkHttp clients (#948) (9684d52)

Bug Fixes

• bind X.509 transport clients to trusted origins (#946) (bccb100)
• fail closed when protected X.509 verification cannot run (#945) (24089bd)

---

This PR was generated with Release Please. See documentation.

[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 16.299s for Java SDK PR #943.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	210ms
tests/chat-completions-create.test.ts	✅ Passed	682ms
tests/chat-completions-stream.test.ts	✅ Passed	331ms
tests/files-content-binary.test.ts	✅ Passed	344ms
tests/files-create-multipart.test.ts	✅ Passed	339ms
tests/files-list-pagination.test.ts	✅ Passed	242ms
tests/initialize-config.test.ts	✅ Passed	266ms
tests/instance-isolation.test.ts	✅ Passed	182ms
tests/models-list.test.ts	✅ Passed	179ms
tests/responses-background-lifecycle.test.ts	✅ Passed	340ms
tests/responses-body-method-errors.test.ts	✅ Passed	456ms
tests/responses-cancel-timeout.test.ts	✅ Passed	248ms
tests/responses-cancel.test.ts	✅ Passed	386ms
tests/responses-compact-retries.test.ts	✅ Passed	485ms
tests/responses-compact.test.ts	✅ Passed	267ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	615ms
tests/responses-create-advanced.test.ts	✅ Passed	1.248s
tests/responses-create-disconnect.test.ts	✅ Passed	1.149s
tests/responses-create-errors.test.ts	✅ Passed	320ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	373ms
tests/responses-create-retries.test.ts	✅ Passed	273ms
tests/responses-create-stream-failures.test.ts	✅ Passed	167ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	261ms
tests/responses-create-stream-wire.test.ts	✅ Passed	6.209s
tests/responses-create-stream.test.ts	✅ Passed	100ms
tests/responses-create-terminal-states.test.ts	✅ Passed	399ms
tests/responses-create-timeout.test.ts	✅ Passed	269ms
tests/responses-create.test.ts	✅ Passed	911ms
tests/responses-delete.test.ts	✅ Passed	300ms
tests/responses-input-items-errors.test.ts	✅ Passed	295ms
tests/responses-input-items-list.test.ts	✅ Passed	302ms
tests/responses-input-items-options.test.ts	✅ Passed	202ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	320ms
tests/responses-input-tokens-count.test.ts	✅ Passed	420ms
tests/responses-malformed-inputs.test.ts	✅ Passed	5.04s
tests/responses-not-found-errors.test.ts	✅ Passed	360ms
tests/responses-parse.test.ts	✅ Passed	491ms
tests/responses-retrieve-retries.test.ts	✅ Passed	400ms
tests/responses-retrieve.test.ts	✅ Passed	353ms
tests/responses-stored-method-errors.test.ts	✅ Passed	948ms
tests/retry-behavior.test.ts	✅ Passed	3.413s
tests/sdk-error-shape.test.ts	✅ Passed	424ms

View OkTest run #33152085081

_{SDK merge (9a5bd8eea255) · head (46e262192d9a) · base (9684d5255f5a) · OkTest (2b1bdfd25e98)}

[github-actions]

Castiron custom code

✅ No new custom-code files detected.

53 mixed files remain; 0 existing customizations changed.

Compared 9684d5255f5a → 46e262192d9a. Generated baselines verified.

53 existing customizations unchanged

• openai-java-core/src/main/kotlin/com/openai/models/audio/AudioResponseFormat.kt
• openai-java-core/src/main/kotlin/com/openai/models/chat/completions/ChatCompletionCreateParams.kt
• openai-java-core/src/main/kotlin/com/openai/models/chat/completions/ChatCompletionMessageFunctionToolCall.kt
• openai-java-core/src/main/kotlin/com/openai/models/chat/completions/ChatCompletionToolMessageParam.kt
• openai-java-core/src/main/kotlin/com/openai/models/embeddings/Embedding.kt
• openai-java-core/src/main/kotlin/com/openai/models/embeddings/EmbeddingCreateParams.kt
• openai-java-core/src/main/kotlin/com/openai/models/responses/ResponseCreateParams.kt
• openai-java-core/src/main/kotlin/com/openai/models/responses/ResponseFunctionToolCall.kt
• openai-java-core/src/main/kotlin/com/openai/models/responses/ResponseFunctionWebSearch.kt
• openai-java-core/src/main/kotlin/com/openai/models/responses/ResponseInputItem.kt
• openai-java-core/src/main/kotlin/com/openai/models/responses/ResponseTextConfig.kt
• openai-java-core/src/main/kotlin/com/openai/models/videos/Video.kt
• openai-java-core/src/main/kotlin/com/openai/services/async/BetaServiceAsync.kt
• openai-java-core/src/main/kotlin/com/openai/services/async/BetaServiceAsyncImpl.kt
• openai-java-core/src/main/kotlin/com/openai/services/async/ResponseServiceAsync.kt
• openai-java-core/src/main/kotlin/com/openai/services/async/ResponseServiceAsyncImpl.kt
• openai-java-core/src/main/kotlin/com/openai/services/async/WebhookServiceAsync.kt
• openai-java-core/src/main/kotlin/com/openai/services/async/WebhookServiceAsyncImpl.kt
• openai-java-core/src/main/kotlin/com/openai/services/async/audio/TranscriptionServiceAsyncImpl.kt
• openai-java-core/src/main/kotlin/com/openai/services/async/chat/ChatCompletionServiceAsync.kt
• openai-java-core/src/main/kotlin/com/openai/services/async/finetuning/checkpoints/PermissionServiceAsyncImpl.kt
• openai-java-core/src/main/kotlin/com/openai/services/blocking/BetaService.kt
• openai-java-core/src/main/kotlin/com/openai/services/blocking/BetaServiceImpl.kt
• openai-java-core/src/main/kotlin/com/openai/services/blocking/ResponseService.kt
• openai-java-core/src/main/kotlin/com/openai/services/blocking/ResponseServiceImpl.kt
• openai-java-core/src/main/kotlin/com/openai/services/blocking/WebhookService.kt
• openai-java-core/src/main/kotlin/com/openai/services/blocking/WebhookServiceImpl.kt
• openai-java-core/src/main/kotlin/com/openai/services/blocking/audio/TranscriptionServiceImpl.kt
• openai-java-core/src/main/kotlin/com/openai/services/blocking/chat/ChatCompletionService.kt
• openai-java-core/src/main/kotlin/com/openai/services/blocking/finetuning/checkpoints/PermissionServiceImpl.kt
• openai-java-core/src/test/kotlin/com/openai/models/beta/responses/BetaResponsesServerEventTest.kt
• openai-java-core/src/test/kotlin/com/openai/models/responses/ResponsesServerEventTest.kt
• openai-java-core/src/test/kotlin/com/openai/services/async/CompletionServiceAsyncTest.kt
• openai-java-core/src/test/kotlin/com/openai/services/async/ImageServiceAsyncTest.kt
• openai-java-core/src/test/kotlin/com/openai/services/async/ResponseServiceAsyncTest.kt
• openai-java-core/src/test/kotlin/com/openai/services/async/WebhookServiceAsyncTest.kt
• openai-java-core/src/test/kotlin/com/openai/services/async/audio/TranscriptionServiceAsyncTest.kt
• openai-java-core/src/test/kotlin/com/openai/services/async/beta/ResponseServiceAsyncTest.kt
• openai-java-core/src/test/kotlin/com/openai/services/async/beta/ThreadServiceAsyncTest.kt
• openai-java-core/src/test/kotlin/com/openai/services/async/beta/threads/RunServiceAsyncTest.kt

13 more in the full report.

A changed generated baseline means this report cannot reliably identify which handwritten lines changed.

Inspect the custom-code diff

Download the exact patch produced by this run (requires repository access):

gh run download 33152125954 --repo openai/openai-java \
  --name castiron-custom-code-33152125954-1 --dir /tmp/castiron-custom-code-33152125954-1
git apply --stat /tmp/castiron-custom-code-33152125954-1/custom-code.patch
cat /tmp/castiron-custom-code-33152125954-1/custom-code.patch

Or reproduce it from an SDK checkout containing the vendored reporter:

git fetch --no-tags origin 9684d5255f5a6b52234ad4dee461300ac2bc9e5a 46e262192d9a9ec5c880d64931c6d3ff0b43b96f
python3 scripts/castiron/custom_code_report.py report \
  --base 9684d5255f5a6b52234ad4dee461300ac2bc9e5a \
  --head 46e262192d9a9ec5c880d64931c6d3ff0b43b96f --fetch --require-head-hash --public \
  --out /tmp/castiron-custom-code-46e262192d9a
cat /tmp/castiron-custom-code-46e262192d9a/custom-code.patch

This is the current full custom patch for mixed files, not an attribution of only the handwritten lines changed by this PR.

Full report and patch