GPT-6 Astra ProvsHorizon Alpha
Horizon Alpha is cheaper than GPT-6 Astra Pro at $0/M vs $10/M input tokens.
| Spec | GPT-6 Astra Pro | Horizon Alpha |
|---|---|---|
| Input price | $10/M tokens | Free |
| Output price | $50/M tokens | Free |
| Context window | 1.1M tokens | 256K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Jul 2025 |
Our Verdict
GPT-6 Astra Pro
Horizon AlphaRunner-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.
Slight edge
API pricing
Cost per 1M tokens
GPT-6 Astra Pro
Input
$10.00
Output
$50.00
Horizon Alpha
Input
$0.000
Output
$0.000
Where to run it
2 hosts
GPT-6 Astra Pro2 hosts
Horizon Alpha
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Research
What we learned reading every model
FAQ
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