Google Gemini 3.1 Pro Preview Custom Tools vs MoonshotAI Kimi K3
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- Kimi K3 is 1.6× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 1M tokens.
- Kimi K3 is the newer model (released 2026-07-16).
| Gemini 3.1 Pro Preview Custom Tools | Kimi K3 | |
|---|---|---|
| Vendor | MoonshotAI | |
| Released | 2026-02-25 | 2026-07-16 |
| Input / 1M | $2.00 | $0.239 |
| Output / 1M | $12.00 | $10.80 |
| Cached input / 1M | $0.20 | $0.21 |
| Blended / 1M (3:1) | $4.50 | $2.88 |
| Context | 1M | 1M |
| Max output | 66K | 944K |
| Accepts | text, image, file, audio, video | text, image, video |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 1 | 30 |
| Cheapest provider, output | $12.00 | $8.25 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | Operational |
Cost calculator
Gemini 3.1 Pro Preview Custom Tools
$300 per month$10.00 per day
Kimi K3
$176 per month$5.88 per day
Kimi K3 saves $124 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
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