Model Releases

226 summarised stories about Model Releases, each linking back to the original source. Browse all topics →

Key players

OpenAI Anthropic MarkTechPost Google The New Stack Meta

Sunday, 9 August 2026

Quoting Claude Opus 5 system prompt

Simon Willison’s Weblog 2 months ago 37

Anthropic released Claude Fable 5 and Claude Mythos 5 on June 9, 2026, then suspended access to comply with U.S. Department of Commerce export controls on June 12, 2026. On July 1, 2026, Anthropic restored access after the controls were lifted on June 30, 2026. As a result, the Claude Opus 5 system prompt instructs the model to confirm the suspension and restoration factually and to direct readers to Anthropic’s notice for details.

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AI Policy Anthropic Model Releases Claude

GitHub Models is now retired

Simon Willison’s Weblog 2 months ago 25

GitHub has retired GitHub Models, ending its unified model playground and API service. The shutdown completed as part of a scheduled retirement brownout, and GitHub Models is no longer available for use in GitHub Actions. Users must switch to other LLM providers or direct APIs (for example, using an OpenAI API key with a spending limit) to keep their automation working.

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OpenAI Developer Tools AI APIs & Integration Model Releases

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