v4.51.0

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)