MoonshotAI Kimi K3 vs OpenAI GPT-5.4
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 2.0× 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).
| Kimi K3 | GPT-5.4 | |
|---|---|---|
| Vendor | MoonshotAI | OpenAI |
| Released | 2026-07-16 | 2026-03-05 |
| Input / 1M | $0.239 | $2.50 |
| Output / 1M | $10.80 | $15.00 |
| Cached input / 1M | $0.21 | $0.25 |
| Blended / 1M (3:1) | $2.88 | $5.63 |
| Context | 1M | 1M |
| Max output | 944K | 128K |
| Accepts | text, image, video | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 30 | 7 |
| Cheapest provider, output | $8.10 | $15.00 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | Operational |
Cost calculator
Kimi K3
$176 per month$5.88 per day
GPT-5.4
$375 per month$12.50 per day
Kimi K3 saves $199 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Kimi K3 with