release: 4.51.0

[github-actions]

Automated Release PR

4.51.0 (2026-08-14)

Features

• api: Add GPT_DAYBREAK and GPT_5_6_CYBER model identifiers (5b9ba3a)
• api: add WebSocket stream IDs (#861) (4936d0b)
• api: add workload identity access token issued event (#859) (2b763fe)
• api: deprecate Sora video APIs (#860) (a191575)
• api: Ultrafast tier, structured MCP and websocket errors, separate websocket events (#863) (ec274a8)

Bug Fixes

• api: Add GPT_DAYBREAK and GPT_5_6_CYBER model identifiers (#856) (5b9ba3a)
• api: clarify audio upload metadata requirements (#857) (593f04c)
• restore ProGuard configuration caching (#842) (fb8daa4)

Chores

• api: Update generated file header text (#846) (d11a357)
• remove Stainless attribution and infrastructure (#858) (942a097)

Documentation

• api: describe response stream event unions (#862) (73b39b8)
• keep README badges on latest release (#839) (33c6b57)

---

This PR was generated with Release Please. See documentation.

[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 17.092s for Java SDK PR #844.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	336ms
tests/chat-completions-create.test.ts	✅ Passed	917ms
tests/chat-completions-stream.test.ts	✅ Passed	508ms
tests/files-content-binary.test.ts	✅ Passed	229ms
tests/files-create-multipart.test.ts	✅ Passed	300ms
tests/files-list-pagination.test.ts	✅ Passed	274ms
tests/initialize-config.test.ts	✅ Passed	186ms
tests/instance-isolation.test.ts	✅ Passed	268ms
tests/models-list.test.ts	✅ Passed	183ms
tests/responses-background-lifecycle.test.ts	✅ Passed	307ms
tests/responses-body-method-errors.test.ts	✅ Passed	486ms
tests/responses-cancel-timeout.test.ts	✅ Passed	305ms
tests/responses-cancel.test.ts	✅ Passed	404ms
tests/responses-compact-retries.test.ts	✅ Passed	453ms
tests/responses-compact.test.ts	✅ Passed	345ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	777ms
tests/responses-create-advanced.test.ts	✅ Passed	1.45s
tests/responses-create-disconnect.test.ts	✅ Passed	980ms
tests/responses-create-errors.test.ts	✅ Passed	404ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	328ms
tests/responses-create-retries.test.ts	✅ Passed	276ms
tests/responses-create-stream-failures.test.ts	✅ Passed	209ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	320ms
tests/responses-create-stream-wire.test.ts	✅ Passed	6.323s
tests/responses-create-stream.test.ts	✅ Passed	111ms
tests/responses-create-terminal-states.test.ts	✅ Passed	580ms
tests/responses-create-timeout.test.ts	✅ Passed	294ms
tests/responses-create.test.ts	✅ Passed	385ms
tests/responses-delete.test.ts	✅ Passed	286ms
tests/responses-input-items-errors.test.ts	✅ Passed	316ms
tests/responses-input-items-list.test.ts	✅ Passed	274ms
tests/responses-input-items-options.test.ts	✅ Passed	601ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	354ms
tests/responses-input-tokens-count.test.ts	✅ Passed	391ms
tests/responses-malformed-inputs.test.ts	✅ Passed	5.13s
tests/responses-not-found-errors.test.ts	✅ Passed	449ms
tests/responses-parse.test.ts	✅ Passed	790ms
tests/responses-retrieve-retries.test.ts	✅ Passed	343ms
tests/responses-retrieve.test.ts	✅ Passed	535ms
tests/responses-stored-method-errors.test.ts	✅ Passed	971ms
tests/retry-behavior.test.ts	✅ Passed	3.435s
tests/sdk-error-shape.test.ts	✅ Passed	451ms

View OkTest run #31837817677

_{SDK merge (9e7d7e6d5c88) · head (d8bfbc1a1dd8) · base (ec274a87048e) · OkTest (a845fa206fa4)}

[openai-sdks]

🤖 Created releases:

• v4.51.0

🌻