Claude Sonnet 4

Anthropic· released 22 May 2025

anthropic/claude-sonnet-4

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

Context window200K tokens

Longest answer: 64K tokens

reads imagereads textreads filetool callingvisionreasoning

About

Claude Sonnet 4 significantly enhances the capabilities of its predecessor, Sonnet 3.7, excelling in both coding and reasoning tasks with improved precision and controllability. Achieving state-of-the-art performance on SWE-bench (72.7%),...

Details

Lab: Anthropicopenrouter.ai · 3 Oct 2026
Context: 200Kopenrouter.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: image, text, fileopenrouter.ai · 3 Oct 2026
Open weights: Noopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/anthropic/claude-sonnet-4· checked 3 Oct 2026