Sonnet 4.5 is now available in Cursor! We're excited to hear what you think.
LLMS
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Claude Sonnet 4.5 : une mise à jour supérieure au même prix
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If you're using Claude anywhere – apps, API, Claude Code – you should upgrade to Sonnet 4.5. It's a drop-in replacement for Sonnet 4, same price, significantly better across the board.
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Sonnet 4.5 Achieves Major Breakthrough in Computer Use Capabilities
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Sonnet 4.5 crushes it on computer use too. 61.4% on OSWorld, which is a 19.2% jump over Sonnet 4. This is the first time computer use has crossed into "actually useful for me personally" territory, especially when used in the Claude Chrome Extension.
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Sonnet 4.5 Improvements: Better Character and Reduced LLM Fluff
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Sonnet 4.5's character has also improved significantly. Its responses are more to the point with less LLM fluff. We've tuned the model across a bunch of dimensions – sycophancy, deception, prompt injection robustness. You'll notice it in how the model actually talks to you.
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Sonnet 4.5 Achieves 82% on SWE-bench with Test-Time Compute
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Sonnet 4.5 hits 82% on SWE-bench with test-time compute. We're adding another dot to what's been a pretty clean exponential toward saturating SWE-bench as a benchmark. At this rate we'll need new evals soon, but it's still a useful signal that the capability curve is holding.
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Claude Sonnet 4.5: Advanced Coding Model with Superior Design
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Introducing Claude Sonnet 4.5. The best coding model in the world combined with the best character of any model I've seen.
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Anthropic to release Claude Sonnet 4.5 soon
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BREAKING : Anthropic is about to release Claude Sonnet 4.5 soon! SOTA on SWE bench
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DeepSeek’s Sparse Attention Enables Massive Price Reduction Economics
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>50% price cut across the board *MAKES DeepSeek money*
— swyx 🐣 (@swyx) 29 septembre 2025
put another way, DeepSeek's Sparse Attention allows DeepSeek to serve 1.8m OUTPUT tokens for the same price as it used to serve 128k output.*
here's my extremely scientific calculation (i also eyeballed it and did it on a… https://t.co/rDNwafshwQ pic.twitter.com/5FpN3V2gQM>50% price cut across the board *MAKES DeepSeek money* put another way, DeepSeek's Sparse Attention allows DeepSeek to serve 1.8m OUTPUT tokens for the same price as it used to serve 128k output.* here's my extremely scientific calculation (i also eyeballed it and did it on a
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AI-Generated Code in Infrastructure: Armin’s Credible 90% Achievement
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Most of the "90% of code written by AI" claims come from vendors selling AI tools and lack credibility as a result Armin (creator of Flask, Jinja, Click) is different – when he says 90% of a new infrastructure project he's building was AI generated it's worth paying attention