Model family timeline
Last updated Jun 9, 2026
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.
4 models
GPT-5.6
PreviewOpenAI's mid-2026 flagship preview, headlined by an industry-leading 1.5M-token context window and long-horizon agentic tool use.
GPT-5.5
AvailableOpenAI's May 2026 GPT-5.5 release: a stronger frontier workhorse positioned for deep reasoning, coding, multimodal analysis, and long-context agent workflows. OpenAI lists an 800K-token input context and 128K-token output limit, with API pricing at $3 / $20 per million input/output tokens.
GPT-5.4
AvailableWorkhorse GPT-5 release with a dedicated Thinking mode; widely deployed across ChatGPT and the API.
GPT-5.2
AvailableOpenAI's December 2025 GPT-5.2 general model release, positioned as a stronger default for reasoning, coding, vision, instruction following, and long-context analysis. OpenAI lists a 400K-token input context, 128K-token output limit, and $2 / $12 per million input/output tokens.