Kimi K3 vs Gemini 3.1 Pro
Kimi K3 is from Moonshot AI, released July 16, 2026. Gemini 3.1 Pro is from Google, released February 19, 2026.
- LMArena Elo1488 vs 1487. Kimi K3 is 0.1% ahead on LMArena Elo.
- Input per 1M$3 vs $2. Gemini 3.1 Pro costs 33% less per million input tokens.
- Output per 1M$15 vs $12. Gemini 3.1 Pro costs 20% less per million output tokens.
Prices are the vendors’ published API rates; Elo is LMArena’s text board. Each figure is dated on its model page.
Interactive Comparison
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$3 / $15 per million tokens | $2 / $12 per million tokens | |
|---|---|---|
| Identity | ||
| Developer | Moonshot AI | |
| Released | Jul 2026 | Feb 2026 |
| Status | GA | Preview |
| Licence | Open weights (Kimi K3 License) | Proprietary |
| Self-hostable | Yes | No |
| Cost | ||
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $6.000 / 1M tokens | $4.500 / 1M tokens |
| Input price | $3.000 / 1M tokens | $2.000 / 1M tokens |
| Output price | $15.000 / 1M tokens | $12.000 / 1M tokens |
| Cached input | $0.30 / 1M tokens (automatic context-cache hit; $3.00 on a cache miss) | $0.20 / 1M tokens (cache hit, <=200k tier) |
| Batch discount | Not offered | 50% off input/output (Batch API) |
| Free tier | Not offered | Not offered |
| Capacity | ||
| Context window | 1M tokens | — |
| Max output | 128k tokens (default; max_completion_tokens configurable up to 1M) | 64k tokens |
| Long-context surcharge | None (flat rate across the 1M window) | 2x input / 1.5x output above 200k prompt tokens |
| Capability | ||
| Vision in | Yes | Yes |
| Audio in | No | Yes |
| Function calling | Yes | Yes |
| Structured output | Yes | Yes |
| Extended reasoning | Yes | Yes |
| Web search | Yes (tool currently being updated by Moonshot; not recommended for near-term use) | Yes |
| Code execution | Not offered | Yes |
| Access | ||
| API | Yes | Yes |
| Chat app | Yes | Yes |
| Cloud marketplaces | Azure AI Foundry (via Fireworks AI), OpenRouter | Not offered |
| Fine-tuning | Not offered | Not offered |
| Measured quality | ||
| LMArena Elo | 1488 (checked Oct 2026) | 1487 (checked Oct 2026) |
| LMArena rank | Rank 16 | Rank 17 |
| GPQA Diamond | 93 | — |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 248 | 330 |
