release: 2.51.1

[stainless-app]

Automated Release PR

2.51.1 (2026-07-30)

Full Changelog: v2.51.0...v2.51.1

Bug Fixes

• client: honor Retry-After delays up to two minutes (#3555) (7fa7946)

Documentation

• add API-key mTLS HTTP client recipes (#3552) (7a3d5e4)

---

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[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 13.502s for Python SDK PR #3557.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	270ms
tests/chat-completions-create.test.ts	✅ Passed	463ms
tests/chat-completions-stream.test.ts	✅ Passed	145ms
tests/files-content-binary.test.ts	✅ Passed	428ms
tests/files-create-multipart.test.ts	✅ Passed	306ms
tests/files-list-pagination.test.ts	✅ Passed	165ms
tests/initialize-config.test.ts	✅ Passed	385ms
tests/instance-isolation.test.ts	✅ Passed	349ms
tests/models-list.test.ts	✅ Passed	296ms
tests/responses-background-lifecycle.test.ts	✅ Passed	265ms
tests/responses-body-method-errors.test.ts	✅ Passed	501ms
tests/responses-cancel-timeout.test.ts	✅ Passed	270ms
tests/responses-cancel.test.ts	✅ Passed	321ms
tests/responses-compact-retries.test.ts	✅ Passed	419ms
tests/responses-compact.test.ts	✅ Passed	303ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	218ms
tests/responses-create-advanced.test.ts	✅ Passed	293ms
tests/responses-create-disconnect.test.ts	✅ Passed	1.322s
tests/responses-create-errors.test.ts	✅ Passed	289ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	278ms
tests/responses-create-retries.test.ts	✅ Passed	507ms
tests/responses-create-stream-failures.test.ts	✅ Passed	155ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	230ms
tests/responses-create-stream-wire.test.ts	✅ Passed	3.761s
tests/responses-create-stream.test.ts	✅ Passed	359ms
tests/responses-create-terminal-states.test.ts	✅ Passed	393ms
tests/responses-create-timeout.test.ts	✅ Passed	267ms
tests/responses-create.test.ts	✅ Passed	391ms
tests/responses-delete.test.ts	✅ Passed	365ms
tests/responses-input-items-errors.test.ts	✅ Passed	389ms
tests/responses-input-items-list.test.ts	✅ Passed	345ms
tests/responses-input-items-options.test.ts	✅ Passed	432ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	286ms
tests/responses-input-tokens-count.test.ts	✅ Passed	371ms
tests/responses-malformed-inputs.test.ts	✅ Passed	2.967s
tests/responses-not-found-errors.test.ts	✅ Passed	389ms
tests/responses-parse.test.ts	✅ Passed	430ms
tests/responses-retrieve-retries.test.ts	✅ Passed	337ms
tests/responses-retrieve.test.ts	✅ Passed	346ms
tests/responses-stored-method-errors.test.ts	✅ Passed	952ms
tests/retry-behavior.test.ts	✅ Passed	3.229s
tests/sdk-error-shape.test.ts	✅ Passed	521ms

View OkTest run #30587050506

_{SDK merge (9b69434b8271) · head (fc2f5f2513be) · base (7a3d5e46b61c) · OkTest (91635c6a2723)}