What the evidence says
- Developer
- Anthropic
- Released
- May 22, 2025
- Domains
- Language · Multimodal · Vision
- Tasks
- Code generation · Language modeling/generation · Quantitative reasoning · Search · Visual question answering · Translation · Image captioning · Instruction interpretation · Mathematical reasoning · Visual puzzles · Code autocompletion · Chat · Character recognition (OCR) · Language modeling · Language generation · Text autocompletion · Retrieval-augmented generation · System control
- Access
- API access
- Weights
- Closed weights
Platform facts
OpenRouter's platform listing, retrieved July 22, 2026. Routed platform prices, not first-party provider prices.
- Input price
- $3.00 per 1M tokens
- Output price
- $15.00 per 1M tokens
- Context length
- 1,000,000 tokens
- Listed on OpenRouter
- May 22, 2025
Common questions
What is Claude Sonnet 4?
Claude Sonnet 4 is a Anthropic model released May 22, 2025, according to Epoch AI's reviewed catalog record. The record classifies it under language, multimodal, vision.
How does Claude Sonnet 4 rank on LMArena?
No board Model Gauntlet mirrors currently lists this exact model revision under a reviewed identity, so no rating is reported here.
What does Claude Sonnet 4 cost?
OpenRouter lists it at $3.00 per million input tokens and $15.00 per million output tokens, retrieved July 22, 2026. Those are the platform's routed prices, not first-party provider prices.