Is gpt-oss-20b or GPT-5.1 Codex Max cheaper?

gpt-oss-20b is cheaper on output tokens ($0.45 vs $10.00 per 1M).

Which has the larger context window, gpt-oss-20b or GPT-5.1 Codex Max?

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

gpt-oss-20b vs GPT-5.1 Codex Max

gpt-oss-20b is cheaper on output tokens, while GPT-5.1 Codex Max offers a larger context window. Choose gpt-oss-20b 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-20b	GPT-5.1 Codex Max
Provider	DigitalOcean	DigitalOcean
Input / 1M tokens	$0.05	$1.25
Output / 1M tokens	$0.45	$10.00
Context window	131K	400K
Parameters	21B	—
Open weights	Yes	No
Released	Aug 2025	Nov 2025

gpt-oss-20b 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.