Is GPT-5.1 Codex or DeepSeek-R1 cheaper?

DeepSeek-R1 is cheaper on output tokens ($5.40 vs $10.00 per 1M).

Which has the larger context window, GPT-5.1 Codex or DeepSeek-R1?

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

GPT-5.1 Codex vs DeepSeek-R1

DeepSeek-R1 is cheaper on output tokens, while GPT-5.1 Codex offers a larger context window. Choose GPT-5.1 Codex or DeepSeek-R1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.1 Codex	DeepSeek-R1
Provider	Azure	Azure
Input / 1M tokens	$1.25	$1.35
Output / 1M tokens	$10.00	$5.40
Context window	400K	164K
Parameters	—	671B
Open weights	No	Yes
Released	Nov 2025	Jan 2025

GPT-5.1 Codex details →DeepSeek-R1 details →

FAQ

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