gpt-5.1-codex

1439 Score third-party Elo · arena.ai / LMArena ?

GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

LLM & Generative AI 1 model 1 listings snapshot Oct 14, 2026, 12:43 AM

Platforms

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Cheapest OpenRouter no official benchmark Input$1.25 Output$10.00 per 1M tokens Fastest OpenRouter lowest p50 latency on this board 128.1 ms p50 Most free quota — largest published free allowance — free tier

Model variants

W3r9 dedup — same model + identical tags merge; prices are listed per billing form

Model	Provider	Tags	Input /1M	Output /1M
openai/gpt-5.1-codex	OpenRouter	391k contextmultimodalreasoning	$1.25	$10.00

Capabilities

official design_arena & architecture metadata

Design Arena Elo official design_arena benchmark (OpenRouter)

uicomponent 1239 · 60.0% wr
dataviz 1215 · 55.9% wr
mobileapps 1191 · 53.4% wr
website 1164 · 56.1% wr
codecategories 1155 · 54.6% wr
gamedev 1143 · 50.5% wr
fullstack 1086 · 44.5% wr
webapps 1012 · 44.0% wr

Input / Output modalities modality: text+image->text

text in+out
image input only

Platform details

per provider

provider	model	Input /1M	Output /1M	Latency ?	Official $/1M	Availability	Data time
OpenRouter	openai/gpt-5.1-codex	$1.25	$10.00	128.1 ms	—	100% available	2026-10-14 00:43:21

1 rows · snapshot 2026-10-14 00:43:21 · from data/public/prices.json + measurements.json