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The Signal

Everything that matters in AI, with our take.

Updated through the day. Every headline links straight to the source. The two lines underneath are ours.

Simon WillisonArticleClaude Watch

Claude Sonnet 5.5

Willison publishes only when there's something real to say. Sonnet 5.5 landing on his blog means capability gains are substantial enough to warrant practitioner attention. Check what changed in reasoning, cost, and context length before defaulting to your current model.

Matthew BermanVideoClaude Watch

What We Built With Sonnet 5.5

Sonnet 5.5 is shipping with measurable improvements on agent reliability and multi-step reasoning. Berman's video-first coverage means he's probably showing working code, not marketing promises. If you're evaluating Claude for agent pipelines, this is worth watching to see what's actually in the release.