Moving to Sonnet 5.5? Four requests that now return a 400
Same price as Sonnet 5, faster, and better at agentic coding by Anthropic's numbers. But the API breaks in ways a model-ID swap won't catch.
4 min read
Models
Frontier model news from Anthropic, OpenAI, Google and xAI.
That 2-point benchmark lead might just be a bigger server
Anthropic measured how much infrastructure settings move agentic coding scores. It's more than many leaderboard gaps.
3 min read
Claude Opus 5.5 costs 20% less per token and Anthropic says it codes better
The numbers behind the release, what changes in practice, and why Anthropic's own benchmark caveat is worth reading.
3 min read