@Lentils80: Breaking: Claude Sonnet 5 appears in the latest Claude Code CLI build!

X AI KOLs Following Models

Summary

Claude Sonnet 5 has appeared in the latest Claude Code CLI build, suggesting a new model release or update from Anthropic.

🚨 Breaking: Claude Sonnet 5 appears in the latest Claude Code CLI build! https://t.co/oI154KC22E
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Cached at: 07/01/26, 02:12 PM

🚨 Breaking: Claude Sonnet 5 appears in the latest Claude Code CLI build! https://t.co/oI154KC22E

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What's new in Claude Sonnet 5

Simon Willison's Blog

Anthropic released Claude Sonnet 5, a model with performance near Opus 4.8 at lower prices, but featuring a new tokenizer that increases token counts for English and code by ~30%, effectively raising costs.