release: 3.28.0

[openai-sdks]

Automated Release PR

3.28.0 (2026-10-09)

Features

• api: add agent environment suspension and expiration (#4046) (6aa25a9)

Chores

• deps: bump astral-sh/setup-uv from 10.1.0 to 10.2.0 (#4026) (8bfffd4)
• deps: bump CodeQL init and analyze to 4.38.2 (#4025) (4f5e618)
• deps: update PyJWT security constraint to 2.14.0 (#3991) (aaed2a7)

---

This PR was generated with Release Please. See documentation.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-09T20:27:12.489580Z	c357fa4	New commits
🔒 Security Review	✅ Completed 2026-10-09T20:27:17.337411Z	c357fa4	New commits

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[github-actions]

Castiron custom code

Evaluated main: 6aa25a9959f451ef67de948b792779e3d130a9c2.

✅ No new custom-code files detected.

52 mixed files remain; 0 existing customizations changed.

Compared 6aa25a9959f4 → c357fa42969c. Generated baselines verified.

52 existing customizations unchanged

• api.md
• scripts/castiron/custom_code_budget.py
• scripts/castiron/custom_code_report.py
• scripts/castiron/test_custom_code_budget.py
• scripts/castiron/test_custom_code_github.py
• scripts/castiron/test_custom_code_publication.py
• scripts/castiron/test_custom_code_report.py
• src/openai/init.py
• src/openai/_client.py
• src/openai/resources/audio/transcriptions.py
• src/openai/resources/audio/translations.py
• src/openai/resources/beta/agents/environments/files.py
• src/openai/resources/beta/agents/sessions/artifacts.py
• src/openai/resources/beta/agents/sessions/sessions.py
• src/openai/resources/beta/beta.py
• src/openai/resources/beta/responses/responses.py
• src/openai/resources/beta/threads/runs/runs.py
• src/openai/resources/beta/threads/threads.py
• src/openai/resources/chat/completions/completions.py
• src/openai/resources/embeddings.py
• src/openai/resources/files.py
• src/openai/resources/live/forks.py
• src/openai/resources/live/live.py
• src/openai/resources/live/sideband.py
• src/openai/resources/realtime/api.md
• src/openai/resources/realtime/realtime.py
• src/openai/resources/responses/responses.py
• src/openai/resources/uploads/uploads.py
• src/openai/resources/vector_stores/file_batches.py
• src/openai/resources/vector_stores/files.py
• src/openai/resources/videos.py
• src/openai/resources/webhooks/init.py
• src/openai/resources/webhooks/webhooks.py
• src/openai/types/beta/agent_session_message.py
• src/openai/types/chat/init.py
• src/openai/types/chat/chat_completion_message_tool_call.py
• src/openai/types/fine_tuning/fine_tuning_job_integration.py
• src/openai/types/realtime/conversation_item_input_audio_transcription_delta_event.py
• src/openai/types/realtime/realtime_error_event.py
• src/openai/types/responses/init.py

12 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 37987018094 --repo openai/openai-python \
  --name castiron-custom-code-37987018094-1 --dir /tmp/castiron-custom-code-37987018094-1
git apply --stat /tmp/castiron-custom-code-37987018094-1/custom-code.patch
cat /tmp/castiron-custom-code-37987018094-1/custom-code.patch

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

git fetch --no-tags origin 6aa25a9959f451ef67de948b792779e3d130a9c2 c357fa42969c6a2ac4ab58b52787d4d7566a6d60
python3 scripts/castiron/custom_code_report.py report \
  --base 6aa25a9959f451ef67de948b792779e3d130a9c2 \
  --head c357fa42969c6a2ac4ab58b52787d4d7566a6d60 --fetch --require-head-hash --public \
  --out /tmp/castiron-custom-code-c357fa42969c
cat /tmp/castiron-custom-code-c357fa42969c/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

[openai-sdks]

OkTest Summary

✅ 236/236 SDK tests passed in 9.328s for Python SDK PR #4045.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	215ms
tests/chat-completions-create.test.ts	✅ Passed	223ms
tests/chat-completions-stream.test.ts	✅ Passed	264ms
tests/files-content-binary.test.ts	✅ Passed	222ms
tests/files-create-multipart.test.ts	✅ Passed	305ms
tests/files-list-pagination.test.ts	✅ Passed	297ms
tests/initialize-config.test.ts	✅ Passed	173ms
tests/instance-isolation.test.ts	✅ Passed	192ms
tests/models-list.test.ts	✅ Passed	207ms
tests/responses-background-lifecycle.test.ts	✅ Passed	196ms
tests/responses-body-method-errors.test.ts	✅ Passed	346ms
tests/responses-cancel-timeout.test.ts	✅ Passed	216ms
tests/responses-cancel.test.ts	✅ Passed	171ms
tests/responses-compact-retries.test.ts	✅ Passed	306ms
tests/responses-compact.test.ts	✅ Passed	292ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	185ms
tests/responses-create-advanced.test.ts	✅ Passed	224ms
tests/responses-create-disconnect.test.ts	✅ Passed	1.311s
tests/responses-create-errors.test.ts	✅ Passed	205ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	222ms
tests/responses-create-retries.test.ts	✅ Passed	252ms
tests/responses-create-stream-failures.test.ts	✅ Passed	718ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	240ms
tests/responses-create-stream-wire.test.ts	✅ Passed	1.927s
tests/responses-create-stream.test.ts	✅ Passed	157ms
tests/responses-create-terminal-states.test.ts	✅ Passed	244ms
tests/responses-create-timeout.test.ts	✅ Passed	235ms
tests/responses-create.test.ts	✅ Passed	577ms
tests/responses-delete.test.ts	✅ Passed	184ms
tests/responses-input-items-errors.test.ts	✅ Passed	435ms
tests/responses-input-items-list.test.ts	✅ Passed	330ms
tests/responses-input-items-options.test.ts	✅ Passed	251ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	284ms
tests/responses-input-tokens-count.test.ts	✅ Passed	192ms
tests/responses-malformed-inputs.test.ts	✅ Passed	1.025s
tests/responses-not-found-errors.test.ts	✅ Passed	255ms
tests/responses-parse.test.ts	✅ Passed	271ms
tests/responses-retrieve-retries.test.ts	✅ Passed	229ms
tests/responses-retrieve.test.ts	✅ Passed	204ms
tests/responses-stored-method-errors.test.ts	✅ Passed	470ms
tests/retry-behavior.test.ts	✅ Passed	3.153s
tests/sdk-error-shape.test.ts	✅ Passed	293ms

View OkTest run #37986927854

_{SDK merge (a124cc6a0dc3) · head (c357fa42969c) · base (6aa25a9959f4) · OkTest (aae4f6a5102a)}

[openai-sdks]

🤖 Created releases:

• v3.28.0

🌻