Sonnet 5.5 fixing a bug with Claude Code.
30% faster and 30% less usage.
Boris Cherny
@bcherny
Claude @claudeai
Introducing Claude Sonnet 5.5, the second model in the Claude 5.5 family.
It’s a clear upgrade over Sonnet 5, runs more than 30% faster, and costs up to 30% less for most work.
It’s a clear upgrade over Sonnet 5, runs more than 30% faster, and costs up to 30% less for most work.
6:25 PM UTC · Sep 28, 2026 · 299.1K Views
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