Is GPT-5.1 Codex Max or GPT-5 cheaper?

GPT-5 is cheaper on output tokens ($8.50 vs $10.00 per 1M).

Which has the larger context window, GPT-5.1 Codex Max or GPT-5?

Both models offer a similar context window.

GPT-5.1 Codex Max vs GPT-5

GPT-5 is cheaper on output tokens. Choose GPT-5.1 Codex Max or GPT-5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.1 Codex Max	GPT-5
Provider	OpenCode Zen	OpenCode Zen
Input / 1M tokens	$1.25	$1.07
Output / 1M tokens	$10.00	$8.50
Context window	400K	400K
Parameters	—	—
Open weights	No	No
Released	Nov 2025	Aug 2025

GPT-5.1 Codex Max details →GPT-5 details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.