What the evidence says
- Developer
- Anthropic
- Released
- August 5, 2025
- Domains
- Language · Multimodal · Vision
- Tasks
- Language modeling/generation · Question answering · System control · Code generation · Search · Quantitative reasoning · Mathematical reasoning · Visual question answering
- 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
- $15.00 per 1M tokens
- Output price
- $75.00 per 1M tokens
- Context length
- 200,000 tokens
- Listed on OpenRouter
- August 5, 2025
Common questions
What is Claude Opus 4.1?
Claude Opus 4.1 is a Anthropic model released August 5, 2025, according to Epoch AI's reviewed catalog record. The record classifies it under language, multimodal, vision.
How does Claude Opus 4.1 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 Opus 4.1 cost?
OpenRouter lists it at $15.00 per million input tokens and $75.00 per million output tokens, retrieved July 22, 2026. Those are the platform's routed prices, not first-party provider prices.