GPT-6 Astra ProvsMistral Small 4
Mistral Small 4 is cheaper than GPT-6 Astra Pro at $0.15/M vs $10/M input tokens.
| Spec | GPT-6 Astra Pro | Mistral Small 4 |
|---|---|---|
| Input price | $10/M tokens | $0.15/M tokens |
| Output price | $50/M tokens | $0.6/M tokens |
| Context window | 1.1M tokens | 262K tokens |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Mar 2026 |
Our Verdict
GPT-6 Astra Pro
Mistral Small 4Runner-up
Not enough votes to call it. On the specs, GPT-6 Astra Pro has the edge: bigger model tier, newer, bigger context window, major provider backing.
Mistral Small 4 costs 83x less per token.
Slight edge
API pricing
Cost per 1M tokens
GPT-6 Astra Pro
Input
$10.00
Output
$50.00
Mistral Small 4
Input
$0.15
67× cheaper
Output
$0.60
83× cheaper
Mistral Small 4 is cheaper on both: 67× input, 83× output.
Where to run it
4 hosts, cheapest first
GPT-6 Astra Pro2 hosts
Mistral Small 42 hosts
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Research
What we learned reading every model
FAQ
Common questions
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