US EditionAnthropic Claude Opus 4 and Sonnet 4 Surface
- On May 22, 2025, Anthropic introduced two new additions to its Claude AI lineup—Opus 4, optimized for programming and extended agent workflows, and Sonnet 4, which focuses on reasoning efficiency—both accessible through Anthropic’s API and partner platforms.
- References to these models appeared in updated Anthropic web configuration files and warn 'Not intended for production use,' indicating early access or ongoing testing.
- Claude Opus 4 targets coding and long agent workflows with a 72.5 percent benchmark score, while Sonnet 4 balances reasoning and efficiency at a 72.7 percent score.
- Anthropic added four API features including code execution, a files API, an MCP connector, and prompt caching for up to one hour to enhance developer collaboration.
- These model launches and API upgrades position Anthropic to compete strongly in AI coding and reasoning, with Opus 4 touted as the world's best coding model.
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AI Startup Anthropic Releases More Powerful Opus Model After Delay
Anthropic is set to roll out two new versions of its Claude artificial intelligence software, including a long-delayed update to its high-end Opus model, as the startup vies to stay ahead of a crowded market.
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