release: 3.20.0

[openai-sdks]

Automated Release PR

3.20.0 (2026-09-26)

Features

• api: add Cyber access programs to Responses (#3956) (09c5b6f)

Chores

• api: clarify documented API error responses (#3965) (384fee3)
• api: document batch error responses (#3961) (6e4a79c)
• api: document files and uploads error responses (#3960) (a9d727f)
• api: document fine-tuning and model errors (#3964) (5d4003c)
• api: document Responses not-found errors (#3959) (63099e7)
• api: document stored chat completion errors (#3963) (a73fe0c)

---

This PR was generated with Release Please. See documentation.

[openai-sdks]

OkTest Summary

✅ 236/236 SDK tests passed in 9.058s for Python SDK PR #3957.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	110ms
tests/chat-completions-create.test.ts	✅ Passed	144ms
tests/chat-completions-stream.test.ts	✅ Passed	151ms
tests/files-content-binary.test.ts	✅ Passed	130ms
tests/files-create-multipart.test.ts	✅ Passed	150ms
tests/files-list-pagination.test.ts	✅ Passed	185ms
tests/initialize-config.test.ts	✅ Passed	119ms
tests/instance-isolation.test.ts	✅ Passed	137ms
tests/models-list.test.ts	✅ Passed	423ms
tests/responses-background-lifecycle.test.ts	✅ Passed	87ms
tests/responses-body-method-errors.test.ts	✅ Passed	536ms
tests/responses-cancel-timeout.test.ts	✅ Passed	210ms
tests/responses-cancel.test.ts	✅ Passed	140ms
tests/responses-compact-retries.test.ts	✅ Passed	202ms
tests/responses-compact.test.ts	✅ Passed	211ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	108ms
tests/responses-create-advanced.test.ts	✅ Passed	193ms
tests/responses-create-disconnect.test.ts	✅ Passed	1.099s
tests/responses-create-errors.test.ts	✅ Passed	159ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	465ms
tests/responses-create-retries.test.ts	✅ Passed	512ms
tests/responses-create-stream-failures.test.ts	✅ Passed	151ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	171ms
tests/responses-create-stream-wire.test.ts	✅ Passed	2.395s
tests/responses-create-stream.test.ts	✅ Passed	186ms
tests/responses-create-terminal-states.test.ts	✅ Passed	173ms
tests/responses-create-timeout.test.ts	✅ Passed	189ms
tests/responses-create.test.ts	✅ Passed	208ms
tests/responses-delete.test.ts	✅ Passed	119ms
tests/responses-input-items-errors.test.ts	✅ Passed	309ms
tests/responses-input-items-list.test.ts	✅ Passed	390ms
tests/responses-input-items-options.test.ts	✅ Passed	208ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	208ms
tests/responses-input-tokens-count.test.ts	✅ Passed	119ms
tests/responses-malformed-inputs.test.ts	✅ Passed	1.646s
tests/responses-not-found-errors.test.ts	✅ Passed	238ms
tests/responses-parse.test.ts	✅ Passed	151ms
tests/responses-retrieve-retries.test.ts	✅ Passed	332ms
tests/responses-retrieve.test.ts	✅ Passed	140ms
tests/responses-stored-method-errors.test.ts	✅ Passed	566ms
tests/retry-behavior.test.ts	✅ Passed	3.012s
tests/sdk-error-shape.test.ts	✅ Passed	224ms

View OkTest run #36212567761

_{SDK merge (0f7260bf108e) · head (331731909c8a) · base (384fee3252e2) · OkTest (f9111d4e2fcd)}

[github-actions]

Castiron custom code

✅ No new custom-code files detected.

47 mixed files remain; 0 existing customizations changed.

Compared 384fee3252e2 → 331731909c8a. Generated baselines verified.

47 existing customizations unchanged

• api.md
• scripts/castiron/README.md
• scripts/castiron/custom_code_report.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/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
• src/openai/types/responses/response.py
• src/openai/types/responses/response_function_web_search.py
• src/openai/types/responses/response_function_web_search_param.py
• src/openai/types/responses/responses_client_event.py
• src/openai/types/responses/responses_client_event_param.py

7 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 36212596655 --repo openai/openai-python \
  --name castiron-custom-code-36212596655-1 --dir /tmp/castiron-custom-code-36212596655-1
git apply --stat /tmp/castiron-custom-code-36212596655-1/custom-code.patch
cat /tmp/castiron-custom-code-36212596655-1/custom-code.patch

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

git fetch --no-tags origin 384fee3252e2336a85450ff38f9bae41f9199616 331731909c8a248a38743a305901a1dd1963cd72
python3 scripts/castiron/custom_code_report.py report \
  --base 384fee3252e2336a85450ff38f9bae41f9199616 \
  --head 331731909c8a248a38743a305901a1dd1963cd72 --fetch --require-head-hash --public \
  --out /tmp/castiron-custom-code-331731909c8a
cat /tmp/castiron-custom-code-331731909c8a/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