Is GPT-OSS 120B or GPT-5.1 Codex Max cheaper?

GPT-OSS 120B is cheaper on output tokens ($0.44 vs $10.00 per 1M).

Which has the larger context window, GPT-OSS 120B or GPT-5.1 Codex Max?

GPT-5.1 Codex Max has the larger context window (400K tokens).

GPT-OSS 120B vs GPT-5.1 Codex Max

GPT-OSS 120B is cheaper on output tokens, while GPT-5.1 Codex Max offers a larger context window. Choose GPT-OSS 120B or GPT-5.1 Codex Max based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-OSS 120B	GPT-5.1 Codex Max
Provider	Abacus	Abacus
Input / 1M tokens	$0.08	$1.25
Output / 1M tokens	$0.44	$10.00
Context window	128K	400K
Parameters	117B	—
Open weights	Yes	No
Released	Aug 2025	Nov 2025

GPT-OSS 120B details →GPT-5.1 Codex Max details →

FAQ

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