Sonnet 5 shipped June 30 and the Bedrock integration followed on July 6 per the AWS Weekly Roundup. The model is positioned squarely at agentic workloads: precise tool calling, stateful context across long tasks, and codebase-scale navigation. Anthropic claims it approaches Opus 4.8 quality at Sonnet pricing, which is a meaningful claim if it holds in practice. Introductory rates are $2/M input, $10/M output through August 31 — notably cheaper than Fable 5's billing transition that kicks in tomorrow. Cybersecurity safeguards are on by default. It's the new default model for Free and Pro plans, so AWS customers picking it up via Bedrock are getting the same model already running for most Claude users.