Claude Sonnet 5 Launch

Anthropic released Claude Sonnet 5, positioning it as a high-performance model with costs closer to Sonnet-tier pricing. The update includes new developer tools and performance improvements.

One continuously updated timeline instead of dozens of separate articles. New developments are appended as the story evolves.

1. AnnouncementJun 30, 2026, 09:23 PM 81%

   Anthropic unveils Claude Sonnet 5 with near-Opus performance at reduced pricing and new developer tools.

   Anthropic released Claude Sonnet 5, positioning it as a high-performance model with costs closer to Sonnet-tier pricing. The update includes new developer tools and performance improvements.

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2. 3 hours later
   AnnouncementJul 1, 2026, 12:21 AM 81%

   Anthropic introduces Claude Sonnet 5, a new AI model emphasizing reasoning and cost-efficiency.

   Anthropic has unveiled Claude Sonnet 5, a new AI model designed to improve reasoning and efficiency for enterprise and developer use.

   Read the full story →