1 AI Catchup article about Claude Sonnet 5, newest first: 1 news story.
Anthropic launched Claude Sonnet 5 on June 30, 2026 as its most agentic Sonnet yet, and made its $2 input and $10 output per million token pricing permanent. Claude Sonnet 5.5 replaced it on September 28; Anthropic now lists Sonnet 5 as a legacy model, still available on the API as claude-sonnet-5.
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