Claude Opus 4.1 is the latest upgrade to Anthropic’s flagship model, delivering stronger performance in coding, reasoning, and agentic workflows. It reaches 74.5% on SWE-bench Verified and introduces major improvements in multi-file code refactoring, debugging accuracy, and fine-grained reasoning.
With extended thinking support up to 64K tokens, Opus 4.1 is well-suited for research, data analysis, and complex tool-assisted reasoning tasks, making it a powerful choice for advanced development and problem-solving.
| Creator | Anthropic |
| Release Date | August, 2025 |
| License | Proprietary |
| Context Window | 200,000 |
| Image Input Support | Yes |
| Open Source (Weights) | No |
| Input Cost | $3/M tokens |
| Output Cost | $15/M tokens |
