Claude Sonnet 5 matches Opus performance at lower cost, now available via API

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Anthropic has launched Claude Sonnet 5, which matches Opus 4.8 on coding and agentic benchmarks while carrying the same pricing as its predecessor, Sonnet 4.6, at $2/$10 per million input/output tokens. The launch rate is available through August 31, after which pricing steps up to $3/$15 per million tokens. The model replaces Sonnet 4.6 as the default reasoning tier across Anthropic's plans and brings improved long-context handling, document parsing, and multi-step agentic task completion. Early users report that agent workflows that previously stalled mid-loop are now completing end-to-end, representing a reliability improvement beyond incremental benchmark gains. Sonnet 5 is accessible via the Anthropic API and Vercel AI Gateway, with Anthropic describing the migration from Sonnet 4.6 as a minimal, low-risk change.

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