Claude Sonnet 5 released with near-Opus 4.8 performance at lower prices
By
Simon Willison
Summary
A brief blog post announcing the release of Claude Sonnet 5, noting that its performance is close to Opus 4.8 but at lower prices. The post highlights that the model is less capable at cyber tasks than Mythos 5, which allowed it to be released without government blocking. The author prefers reading the developer docs over the official announcement for more actionable information.
Source
Twitter / XClaude Sonnet 5 released with near-Opus 4.8 performance at lower pricessimonwillison.netKey quotes
· 3 pulledits performance is close to that of Opus 4.8, but at lower prices
Sonnet 5 is significantly less capable at cyber tasks than Mythos 5: its safeguards are thus similar to those we apply to Opus 4
I always head straight for the "what's new" developer docs because they tend to have more actionable information than the official announcement post.
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