OpenAI releases GPT-5.5 with 1M token context window and GPT-5.5 Pro via Responses API
By
arabicalories
Lightly browned and well buttered. A solid pick from the rack.
Summary
OpenAI released GPT-5.5, a new frontier model for complex professional work, to the Chat Completions and Responses API. It also released GPT-5.5 pro for tougher problems via the Responses API and Batch. GPT-5.5 features a 1M token context window, image input, structured outputs, function calling, prompt caching, tool search, built-in computer use, hosted shell, apply patch, Skills, MCP, and web search, with medium reasoning effort as default.
Key quotes
· 3 pulledReleased GPT-5.5, a new frontier model for complex professional work, to the Chat Completions and Responses API
Released GPT-5.5 pro for Responses API requests, including through Batch, for tougher problems that benefit from more compute
GPT-5.5 supports a 1M token context window, image input, structured outputs, function calling, prompt caching, Batch, tool search, built-in computer use, hosted shell, apply patch, Skills, MCP, and web search
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