Claude Opus 4.6 with Thinking is Anthropic flagship model released in April 2026. It tops the LMSYS Chatbot Arena with a score of 1506 and achieves 80.8% on SWE-bench Verified, making it the best model for agentic coding tasks. It features 1M token context with 76% recall on MRCR v2 (8-needle), adaptive thinking with effort controls, and 128K max output tokens. Opus 4.6 excels at complex reasoning, long document analysis, and autonomous multi-step workflows via Claude Code.
| Benchmark | Score |
|---|---|
| SWE-bench Verified | 80.8% |
| MRCR v2 (1M, 8-needle) | 76% |
| Terminal-Bench 2.0 | 65.4% |
| LMSYS Arena | 1506 |