Copilot
GitHub makes GPT-6.1 Sol generally available in Copilot with a gradual rollout across VS Code, Visual Studio, JetBrains, Xcode, Eclipse, the CLI and mobile.
GitHub Changelog · Sep 29, 2026 ·
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Codex
At DevDay OpenAI says Codex now runs fully in the cloud, publishes its harness on GitHub, and launches Codex Security Cloud with scheduled scans.
Simon Willison's Weblog · Sep 29, 2026 ·
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Security
Anthropic's Frontier Red Team reports Claude Mythos Preview and GLM-5.3 hijacked control flow in 4-6% of binary exploitation trials, where earlier models managed none.
Simon Willison's Weblog · Sep 29, 2026 ·
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