Claude Sonnet 5.5 vs 
Kimi K3.1 Pro
Both are currently SOTA. Each row is one board’s result, and the marked figure is the one that board ranks higher. Rows are not added together, so there is no overall winner: the boards measure different things, and where they differ, the difference is the finding.Each rank is the board’s own: the rank it publishes, or the model’s place in the board’s own order where it publishes none. Scores from different boards cannot be compared.
| Board | Claude Sonnet 5.5 | Kimi K3.1 Pro |
|---|---|---|
| Artificial Analysis LLM Leaderboard Artificial Analysis Intelligence Index | 54.5 No. 5 of 43 | 46.5 No. 10 of 43 |
| Arena — Agent Overall | 0.146 No. 3 of 57 | 0.047 No. 13 of 57 |
| Artificial Analysis Coding Agents Artificial Analysis Coding Agent Index | 0.593 No. 5 of 27 | — |
| Epoch AI Benchmarking Hub FrontierMath Tiers 1–3 | 88.8% No. 8 of 85 | — |
| Terminal-Bench 4.0 Terminal-Bench 4.0 | 61.8% No. 2 of 35 | — |
| Arena — Code Overall | 1770 No. 3 of 152 | 1695 No. 9 of 152 |
| Arena — Text Overall (style control) | 1477 No. 31 of 419 | — |
| Arena — Vision Overall (style control) | 1265 No. 40 of 167 | — |
At a glance
| Developer | Anthropic | Kimi |
|---|---|---|
| Weights | closed | closed |
| Released | — | — |
| Price Blended Price, USD per 1M tokens (3:1 input:output) | $4.00 | $4.00 |
| Value: where it sits on the kill line | SOTA | SOTA |
Claude Sonnet 5.5 →Kimi K3.1 Pro → How the kill line is drawn →