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Timeline / Milestones

OpenAI releases GPT-5.5

Model releaseOpenAI23 Apr 2026

OpenAI released GPT-5.5, which it described as its strongest agentic coding model so far, and made it the default model in Codex.

Sources: OpenAI

Releases around this date

223 Feb139 Mar4623 Mar666 Apr6620 Apr19194 May101118 May15131 Jun524615 Jun

Releases per week across every project listed on recomp.party; the dashed line is 23 Apr 2026. A date on the timeline is context, not a cause. Faded weeks are still filling in: new projects are usually listed one to three weeks after they appear.