Anthropic Claude Opus 5 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 2.6× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 1M tokens.
- Kimi K3 output costs $8.25 per 1M via Decart, against the list price of $15.00.
| Claude Opus 5 | Kimi K3 | |
|---|---|---|
| Vendor | Anthropic | MoonshotAI |
| Released | 2026-07-24 | 2026-07-16 |
| Input / 1M | $5.00 | $0.192 |
| Output / 1M | $25.00 | $15.00 |
| Cached input / 1M | $0.50 | $0.182 |
| Blended / 1M (3:1) | $10.00 | $3.89 |
| Context | 1M | 1M |
| Max output | 128K | 944K |
| Accepts | text, image, file | text, image, video |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 11 | 30 |
| Cheapest provider, output | $25.00 | $8.25 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | Operational |
Cost calculator
Claude Opus 5
$675 per month$22.50 per day
Kimi K3
$237 per month$7.88 per day
Kimi K3 saves $438 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
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