OpenAI o1-pro deprecated, retires 2026-10-23 → GPT-5.5 Pro

OpenAI has deprecated o1-pro, the o-series model released as o1-pro-2025-03-19, with retirement set for 2026-10-23 and migration directed to GPT-5.5 Pro, according to the provider's deprecation announcement. The model carries a 200k context window, 100k max output, and pricing of $150 per 1M input tokens and $600 per 1M output tokens, and is also referenced as o1-pro and openai/o1-pro. The deprecation gives teams roughly a year to find and migrate code calling o1-pro before it stops serving requests.

OA▲ Retiring soon OpenAI o1-pro OpenAI · o1-pro-2025-03-19 o-seriestext+vision200k context100k max out$150 / $600 per 1M also matches: o1-pro-2025-03-19 o1-pro openai/o1-pro provider announcement → https://developers.openai.com/api/docs/deprecations Does your code call OpenAI o1-pro? $ curl -fsSL https://llmstatus.ai/install.sh | bash Then mm status in any repo — it finds every model you use and flags the ones on a clock. No account, nothing uploaded. Get alerted before it retires → https://llmstatus.ai/sign-up