chore(api): document fine-tuning and model errors

[markstuart-oai]

Summary

Clarifies fine-tuning and model error responses while retaining existing Python behavior.

Changes

• Describe applicable validation, lookup, permission and rate-limit errors.
• Preserve existing methods, return types and exception behavior.

[github-actions]

Castiron custom code

✅ No new custom-code files detected.

47 mixed files remain; 0 existing customizations changed.

Compared a73fe0c3d404 → 870ca7a345b7. 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 36178793495 --repo openai/openai-python \
  --name castiron-custom-code-36178793495-1 --dir /tmp/castiron-custom-code-36178793495-1
git apply --stat /tmp/castiron-custom-code-36178793495-1/custom-code.patch
cat /tmp/castiron-custom-code-36178793495-1/custom-code.patch

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

git fetch --no-tags origin a73fe0c3d404335a342d1251bd32709b8e3d76f2 870ca7a345b7dcd9b3cabc5052cebe7c0274eac1
python3 scripts/castiron/custom_code_report.py report \
  --base a73fe0c3d404335a342d1251bd32709b8e3d76f2 \
  --head 870ca7a345b7dcd9b3cabc5052cebe7c0274eac1 --fetch --require-head-hash --public \
  --out /tmp/castiron-custom-code-870ca7a345b7
cat /tmp/castiron-custom-code-870ca7a345b7/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 8.901s for Python SDK PR #3964.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	193ms
tests/chat-completions-create.test.ts	✅ Passed	152ms
tests/chat-completions-stream.test.ts	✅ Passed	115ms
tests/files-content-binary.test.ts	✅ Passed	159ms
tests/files-create-multipart.test.ts	✅ Passed	160ms
tests/files-list-pagination.test.ts	✅ Passed	134ms
tests/initialize-config.test.ts	✅ Passed	118ms
tests/instance-isolation.test.ts	✅ Passed	122ms
tests/models-list.test.ts	✅ Passed	156ms
tests/responses-background-lifecycle.test.ts	✅ Passed	151ms
tests/responses-body-method-errors.test.ts	✅ Passed	290ms
tests/responses-cancel-timeout.test.ts	✅ Passed	164ms
tests/responses-cancel.test.ts	✅ Passed	165ms
tests/responses-compact-retries.test.ts	✅ Passed	240ms
tests/responses-compact.test.ts	✅ Passed	189ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	327ms
tests/responses-create-advanced.test.ts	✅ Passed	168ms
tests/responses-create-disconnect.test.ts	✅ Passed	1.173s
tests/responses-create-errors.test.ts	✅ Passed	134ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	321ms
tests/responses-create-retries.test.ts	✅ Passed	153ms
tests/responses-create-stream-failures.test.ts	✅ Passed	119ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	221ms
tests/responses-create-stream-wire.test.ts	✅ Passed	2.638s
tests/responses-create-stream.test.ts	✅ Passed	67ms
tests/responses-create-terminal-states.test.ts	✅ Passed	190ms
tests/responses-create-timeout.test.ts	✅ Passed	167ms
tests/responses-create.test.ts	✅ Passed	244ms
tests/responses-delete.test.ts	✅ Passed	134ms
tests/responses-input-items-errors.test.ts	✅ Passed	297ms
tests/responses-input-items-list.test.ts	✅ Passed	266ms
tests/responses-input-items-options.test.ts	✅ Passed	213ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	185ms
tests/responses-input-tokens-count.test.ts	✅ Passed	184ms
tests/responses-malformed-inputs.test.ts	✅ Passed	1.845s
tests/responses-not-found-errors.test.ts	✅ Passed	199ms
tests/responses-parse.test.ts	✅ Passed	259ms
tests/responses-retrieve-retries.test.ts	✅ Passed	169ms
tests/responses-retrieve.test.ts	✅ Passed	132ms
tests/responses-stored-method-errors.test.ts	✅ Passed	451ms
tests/retry-behavior.test.ts	✅ Passed	3.074s
tests/sdk-error-shape.test.ts	✅ Passed	294ms

View OkTest run #36178748225

_{SDK merge (6d3f08fe2526) · head (870ca7a345b7) · base (a73fe0c3d404) · OkTest (f9111d4e2fcd)}

[jbeckwith-oai]

Reviewed 870ca7a. No findings.

Parsed the complete immutable base/head API-reference YAML with duplicate-key rejection. The only semantic changes are 38 added error responses across 16 fine-tuning/grader/model operations; removing those additions makes the parsed document identical to the base. Every new ErrorResponse/PermissionErrorResponse reference resolves. The transformed-spec MD5 matches .castiron.stats.yml, whose changes are limited to the five generation/provenance fields.

The complete two-file diff leaves runtime code, methods, public types, existing success responses, parameters, schemas, exception handling, dependencies, and workflow/budget policy unchanged.

Exact-head repository CI is green, including baseline consistency, compatibility/breaking-change checks, build, lint, and applicable runtime tests. The successful OkTest run 36178748225 is pinned to this SDK head/base and reports 236/236 cases passing.

Validation here was source review and full-YAML semantic/reference/hash checks; I did not rerun the SDK suite locally or make live API calls.

[markstuart-oai]

Thanks for the exact-head review and the independent YAML, reference, and checksum checks. The reviewed head 870ca7a is unchanged. This remains a documentation/metadata-only update: existing APIs and error behavior are preserved, with no user-code migration required. CI and the 236-case downstream suite are green; no further change is needed for this review.