GPT-6 Astra ProvsKimi K2
Kimi K2 is cheaper than GPT-6 Astra Pro at $0.57/M vs $10/M input tokens.
| Spec | GPT-6 Astra Pro | Kimi K2 |
|---|---|---|
| Input price | $10/M tokens | $0.57/M tokens |
| Output price | $50/M tokens | $2.3/M tokens |
| Context window | 1.1M tokens | — |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Jul 2025 |
Our Verdict
GPT-6 Astra Pro
Kimi K2Runner-up
Not enough votes to call it. On the specs, GPT-6 Astra Pro has the edge: newer, bigger context window, major provider backing.
Kimi K2 costs 22x less per token.
Too close to call
API pricing
Cost per 1M tokens
GPT-6 Astra Pro
Input
$10.00
Output
$50.00
Kimi K2
Input
$0.57
18× cheaper
Output
$2.30
22× cheaper
Kimi K2 is cheaper on both: 18× input, 22× output.
Where to run it
3 hosts
GPT-6 Astra Pro2 hosts
Kimi K21 host
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
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