Anthropic has made Claude Sonnet 5 the default model for its Claude Code product, effective June 30, 2026. This mid-tier model offers performance comparable to the previous Opus 4.8 at a lower cost, featuring a 1 million token context window and adaptive thinking enabled by default. Sonnet 5 also demonstrates improved safety features and is now accessible across all Claude plans, including Free and Pro tiers, with introductory pricing available until August 31, 2026. AI
IMPACT Accelerates adoption of advanced AI capabilities for coding tasks, potentially lowering costs for developers.
RANK_REASON New model release by a frontier lab with default deployment to users. [lever_c_demoted from frontier_release: ic=2 ai=1.0]
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