Tools & releases
Anthropic Launches Claude Sonnet 5.5 with Massive Agentic Coding Gains
Anthropic released Claude Sonnet 5.5, generating outputs 30%+ faster and costing up to 30% less per task than Sonnet 5. It scores 70.6% on Terminal-Bench 4.0 and comes within about two points of Opus 5.5 on multi-file coding tasks.
September 29, 2026 2 min read
Curated by Oleksandr Kuzmenko, AI Product EngineerUpdated September 29, 2026Sources cited on every story
AI-assisted · editor-reviewedHow we use AI
Why it matters
Anthropic released Claude Sonnet 5.5, generating outputs 30%+ faster and costing up to 30% less per task than Sonnet 5. It scores 70.6% on Terminal-Bench 4.0 and comes within about two points of Opus 5.5 on multi-file coding tasks.