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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

Compare GPT 5.1 Codex Max with…

GPT 5.1 Codex Max vs Claw Low$1.50/1MGPT 5.1 Codex Max vs Gemini 3 Pro Image$12.00/1MGPT 5.1 Codex Max vs Gemma 4 31B Garnet$0.31/1MGPT 5.1 Codex Max vs Doubao 1.5 Vision Pro 32k$1.38/1MGPT 5.1 Codex Max vs GLM 4.5$1.30/1MGPT 5.1 Codex Max vs Auto model (Standard)$19.99/1M

FAQ

Pricing is per 1M tokens (USD); confirm with the provider before production use.