Anthropic may release Claude Sonnet 5.5 within days

Anthropic could launch Claude Sonnet 5.5 as early as next week following a fresh partner checkpoint test. Here is what the latest leaks reveal!

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Timeline · 1 report

2026-09-27 21:48 · TestingCatalog AI News
Anthropic may release Claude Sonnet 5.5 within days

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DC appeals court sides with Pentagon on blacklist of Anthropic — The Hill Technology
Anthropic’s new AI system lets lab machines talk to each other and run experiments — Mint AI
Optimizing my AI subscriptions: Claude Pro (Opus) vs. ChatGPT Plus vs. Perplexity Pro? — r/AI_Agents
Did Anthropic’s A.I. Really Make a Scientific Discovery on Its Own? — New York Times AI
I asked Claude Code to make it's own version of that guy's "time" video by Astra 5.6 from yesterday. — r/ChatGPT
I was curious — r/OpenAI
Wtf just happened ⁉️ — r/GeminiAI
Anthropic's Claude Breaks Physics Record With a Nine-Loop Particle Calculation — AlphaSignal

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