Claude Sonnet 4.5

Anthropic· released 29 Sept 2025

anthropic/claude-sonnet-4.5

Input / 1M tokens: $3
Output / 1M tokens: $15

Context window1M tokens

Longest answer: 64K tokens

reads textreads imagereads filetool callingvisionreasoning

About

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...

Details

Lab: Anthropicopenrouter.ai · 3 Oct 2026
Context: 1,000Kopenrouter.ai · 3 Oct 2026
Input price: $3 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $15 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 64,000 tokensopenrouter.ai · 3 Oct 2026
Inputs: text, image, fileopenrouter.ai · 3 Oct 2026
Open weights: Noopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/anthropic/claude-sonnet-4.5· checked 3 Oct 2026