GPT-5 model releases

A source-backed timeline for the GPT-5 model family, collecting release dates, labs, access details, context windows, and major lifecycle changes.

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GPT-5.6

OpenAI

OpenAI

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2 models

OpenAI's mid-2026 flagship, headlined by an industry-leading 1.5M-token context window and long-horizon agentic tool use.

Workhorse GPT-5 release with a dedicated Thinking mode; widely deployed across ChatGPT and the API.