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The balanced default — most teams should start here.
Sonnet 5 is Anthropic's mid-tier model: close to Opus on most everyday tasks at a third of the cost, with noticeably better latency. It's the model most agents on this platform are actually built on.
Good at code, good at writing, good at following detailed instructions without drifting.
Claude Sonnet 5 shows its cost before every call and covers you with a hard cap — or call free under an active time pass.