| Thinking Machines Lab | Inkling (effort=0.99) | 82.0% | Source for Inkling (effort=0.99) on CharXiv Reasoning — Python enabled (opens in a new tab) | 160001 |
| Anthropic | Claude Sonnet 5 (max) | 88.3% | Source for Claude Sonnet 5 (max) on CharXiv Reasoning — Python enabled (opens in a new tab) | 20013 |
| Moonshot AI | Kimi K2.6 (thinking) | 86.7% | Source for Kimi K2.6 (thinking) on CharXiv Reasoning — Python enabled (opens in a new tab) | 120002 |
| OpenAI | GPT-5.2 (xhigh) | 88.7% | Source for GPT-5.2 (xhigh) on CharXiv Reasoning — Python enabled (opens in a new tab) | 10012 |