GPT-5.1-Codex

OpenAIProprietaryReasoningProvisionalReleased Nov 13, 2025Input: text, image

Overall score

50.4

Rank 95 of 222 · 36.1–64.8

Context window

400K

400,000 tokens

Price per 1M tokens

$1.25 in · $10.00 out

Source: BenchLM

Blended price

$3.44

3:1 input:output tokens

Output speed

—

Not measured yet

Category scores

Scores per capability area with the model's rank among ranked models in that category.

Higher is better. #N is the model's rank in that category, where it is eligible to be ranked.

As reported in system cards, papers and public evaluations. Position compares this model with every other model reporting the same benchmark.

Gert Labs	49.68	#22 of 52
JobBench	26.2	#25 of 34

1163

#71 of 91

USD per 1M tokens.

Source	Input	Output	Cached in
List price (BenchLM)	$1.25	$10.00	$0.13
OpenRouter openai/gpt-5.1-codex	$1.25	$10.00	$0.13

OpenAI's GPT-5.1-Codex model documentation lists $1.25 input / $0.125 cached input / $10.00 output per million text tokens.

Human-preference ratings from LMArena. Best-rated variant shown.

1337

#122 · 5K votes

Measured by us through OpenRouter (median of trials).

Not measured yet.