Claude Opus 5.5 vs Kimi K3
⚖ Claude Opus 5.5 wins 4 of 4 categories, but Kimi K3 is 1.3× cheaper for everyday text work. Pick Claude Opus 5.5 when quality matters most, Kimi K3 at volume.
Scores by category
| Category | Claude Opus 5.5 | Kimi K3 |
|---|---|---|
| Overall | 97 | 65 |
| Writing | 100 | 69 |
| Support | 90 | 73 |
| Coding | 100 | 74 |
Provisional scores, 0 to 100 among the models we track, from Arena and Epoch AI. Value weighs the overall score against cost.
Price and specs
| Claude Opus 5.5 | Kimi K3 | |
|---|---|---|
| Vendor | Anthropic | Moonshot AI |
| Released | 2026-09-22 | 2026-07-16 |
| Context window | 1M | 1M |
| Open weights | No | Yes |
| Input per 1M tokens | $4.00 | $3.00 |
| Output per 1M tokens | $20.00 | $15.00 |
| Per 1,000 tasks | $16.00 | $12.00 |