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Claude Sonnet 5.5 Just Landed in Copilot: When to Use It, First Call, and Why List Price Lies

This story is from 2026-09-30. It is preserved in the archive; the latest stories are on the live feed.

Attributed compile (not original research) Primary source: Introducing Claude Sonnet 5.5 (Anthropic), published 2026-09-28 Copilot availability: Claude Sonnet 5.5 in GitHub Copilot (GitHub Changelog), published 2026-09-28 Builder details (model IDs / effort / Claude Code):* Building with Claude Son…

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  1. 2026-09-30 13:40 · DEV Community — AI
    Claude Sonnet 5.5 Just Landed in Copilot: When to Use It, First Call, and Why List Price Lies

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  1. Anthropic warns of ‘existential risks to humanity’ in IPO prospectus — Financial Times AI
  2. Introducing Claude Sonnet 5.5 on AWS — AWS Machine Learning Blog
  3. With Opus 5.5 and Sonnet 5.5 both apparently outperforming Sol and Astra, Anthropic has technically made OpenAI’s Dev Day a lot more interesting. OpenAI is reportedly planning 20+ launches tomorrow, so I’m really curious to see what they have in store now. The timing couldn’t be more interesting. 😅 — r/OpenAI
  4. Introducing Anthropic models on Amazon Bedrock for in-region inference in Seoul and Singapore — AWS Machine Learning Blog
  5. Amazon Bedrock expands Claude model availability to in-country inferencing in India — AWS Machine Learning Blog
  6. Kimi K3: A Claude clone or something else? — CoreWeave Blog
  7. Tutorial: Benchmarking GPT-6 Astra vs Claude Fable 5.1 vs GPT-5.6 Sol using W&B Weave — CoreWeave Blog
  8. Bill Gates warns of AI risks, calls for Congress to step in: 'It's not a hoax at all' — Mint AI

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