Claude Sonnet 4.6 and GLM-5.1 tie on the Respan Index at 34.4. Claude Sonnet 4.6 leads on 6 of the 10 benchmarks both report. GLM-5.1 is 2.8x cheaper per token at list price. Claude Sonnet 4.6 has the larger context window (1M tokens).
* Estimated: no published scores in that category. How the Respan Index works
| 35.5% |
| 34% |
| SWE-bench Verified (Epoch AI) | 75.2% | 74.2% |
| Vending-Bench 2 (Andon Labs) | 7204.14 | 5634.41 |
| WeirdML (Håvard Tveit Ihle) | 66.1% | 57.1% |
| LMArena Elo | 1458 | 1462 |
| LMArena WebDev (LMArena) | 1521 | 1509 |
Higher is better. Each score links to where it was published.