# Claude Opus 4.1: AI model fact sheet

- **Provider:** anthropic
- **Released:** 2025-08-05
- **Context window:** 200,000 tokens
- **Parameters:** Not disclosed
- **API pricing:** $15.00 / 1M input, $75.00 / 1M output
- **OpenRouter ID:** anthropic/claude-opus-4.1
- **Capabilities:** conversation, reasoning, code-generation, analysis, agentic-tool-use, planning

Claude Opus 4.1 is an updated version of Anthropic's flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains in multi-file code refactoring, debugging precision, and detail-oriented reasoning. The model supports extended thinking up to 64K tokens and is optimized for tasks involving research, data analysis, and tool-assisted reasoning.

## Benchmarks

| Benchmark | Score |
| --- | --- |
| SWE-bench Verified | 74.5% |

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/claude-opus-4.1