GPT 5.1 Codex Max
NanoGPT
GPT 5.1 Codex Max by NanoGPT costs $2.50 per 1M input tokens and $20.00 per 1M output tokens, with a 400K-token context window.
Pricing
Input (per 1M tokens)
$2.50
Output (per 1M tokens)
$20.00
Cached input (per 1M)
—
Specifications
- Provider
- NanoGPT
- Context window
- 400K tokens
- Parameters
- —
- Released
- Nov 2025
- Open weights
- No
- Frontier model
- No
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FAQ
Pricing is per 1M tokens (USD); confirm with the provider before production use.