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Timeline / Milestones

Anthropic releases Claude Opus 5.5

Model releaseAnthropic22 Sept 2026

Anthropic released Claude Opus 5.5. It is the model the Claude Code game-recreation rule of late October was added for.

Sources: Anthropic

Releases around this date

3727 Jul514510 Aug347024 Aug841287 Sept13618221 Sept3375975 Oct1077135819 Oct144414082 Nov447

Releases per week across every project listed on recomp.party; the dashed line is 22 Sept 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.