Claude Sonnet 4.5

Overview

Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...

Best for

Best for
Daily driver for agentic coding and analysis

Use cases

• Claude Code / Cursor agent loops
• research synthesis
• customer support agents

How to use / API access

Call via OpenRouter with model id `anthropic/claude-sonnet-4.5`.

• openrouter · anthropic/claude-sonnet-4.5 Docs

OpenRouter id: anthropic/claude-sonnet-4.5

Benchmarks

• Intelligence Index (artificial-analysis) : 36.4 index
• Coding Index (artificial-analysis) : 52.1 index
• Agentic Index (artificial-analysis) : 24.6 index
• Design Arena 3d (other) : 1234 elo · #36
• Design Arena asciiart (other) : 1244 elo · #10
• Design Arena codecategories (other) : 1226 elo · #37
• Design Arena dataviz (other) : 1209 elo · #43

Enterprise DNA angle

Omni wires Sonnet into scheduled jobs and CRM write-backs so model quality becomes an operating layer, not a chat tab.

Notes

Claude Sonnet 4.5 is listed in the EDNA Models directory from the OpenRouter catalogue.