Claude Sonnet 4 moves to version claude-sonnet-4-20250514

The OnAirToday AI Progress Tracker recorded a verified change to Anthropic's Claude Sonnet 4 (version claude-sonnet-4-20250514): Version now claude-sonnet-4-20250514 (was claude-sonnet-4).

Claude Sonnet 4 is a hybrid-reasoning model designed for coding, analysis and tool-assisted workflows, with standard and extended-thinking modes. It subsequently gained a 1-million-token context option and has been followed by newer Sonnet generations, including Sonnet 4.5.

What changed in this review:

• Identified the dated API model as claude-sonnet-4-20250514.
• Added the documented 1M-token context beta alongside the standard 200K context window.
• Standard pricing remains $3 input and $15 output per million tokens.
• Requests above 200K input tokens use documented rates of $6 input and $22.50 output per million tokens.
• Replaced unsupported benchmark entries with Anthropic's published Sonnet 4 results.
• Claude Sonnet 4.5 shipped as a newer Sonnet generation on September 29, 2025.

Teams building on Claude Sonnet 4 should confirm limits, pricing and benchmark coverage against the vendor's own documentation before relying on these figures.

The full profile — capabilities, benchmark citations, known flaws and risk guidance — is on the tracker at /ai-models/claude-sonnet-4.

References:

• https://www.anthropic.com/news/claude-4
• https://www.anthropic.com/news/1m-context
• https://www.anthropic.com/news/claude-sonnet-4-5
• https://www.anthropic.com/news/disrupting-AI-espionage