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All Changelog Posts29 Sep, 2026

Claude Sonnet 5.5 is now available in Casey 🎉

IMPROVED

Claude Sonnet 5.5 is now available as Casey’s Balanced model.

It’s faster, better, and more cost-efficient:

  • ⚡ 30%+ faster
  • 💰 Up to 30% less expensive for most work
  • 🧠 An upgrade over Claude Sonnet 5

Switch models anytime from the bottom-right corner of your Casey chat and give it a try! ✨

Learn more about Claude Sonnet 5.5 from Anthropic.

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