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Source Simon Willison's Weblog simonwillison.net Analyst
June 30, 2026 ai_technology developer

What's new in Claude Sonnet 5

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Summary

What's new in Claude Sonnet 5 Claude Sonnet 5 came out this morning . I always head straight for the "what's new" developer docs because they tend to have more actionable information than the official announcement post. Anthropic say of Sonnet 5 that "its performance is close to that of Opus 4.8, but at lower prices". The system card helps explain how they were able to release the model without being blocked by the US government: Sonnet 5 is significantly less capable at cyber tasks than My

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