Claude Sonnet 5.5 released and now available in GitHub Copilot
On September 28, 2026, Anthropic released Sonnet 5.5, which it describes as a significantly cheaper, faster work partner (TechCrunch); it is also available in GitHub Copilot. Comparisons set it against GPT-6 Sol.
Who is affected and how
- senior developer
- Test it on your own codebase for speed and quality against the previous model.
- CTO
- Examine the effect of the cheaper model on your AI tooling budget.
Sources
- Claude Sonnet 5.5 in GitHub Copilotthe github blog · Sep 28, 2026
- Claude Sonnet 5.5 in GitHub Copilot - GitHub Changeloggithub.blog · Sep 28, 2026
- GitHub Adds GPT-6.1 Sol to Copilot for Multistep Coding Work | Superpower Dailysuperpowerdaily.com · Sep 29, 2026
- GitHub Copilot、GPT-6.1 Solを一般提供開始 少ないトークンで複数ステップコーディングに対応 | AIツールギャラリーai-gallery.jp · Sep 29, 2026
- HydraFusion Moves from the CLI to VS Code and the Copilot App | Mail Studiomail-studio.com · Oct 2, 2026
- Anthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner | TechCrunchtechcrunch.com · Sep 28, 2026
- Claude Sonnet 5.5 vs GPT-6 Sol: Benchmarks, Specs & Pricingkingy.ai · Sep 28, 2026
Machine-generated summary based on the titles and excerpts of the source articles. The facts come from the linked article.