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GPT-5.1 Codex Max

GPT‑5.1-Codex-Max is purpose-built for agentic coding.

text + image + file → text · made by OpenAI

$1.25$10per Mtok in / out
Databricks · 6 sellers

Sold by 6 ways

SellerLaneRate
Databricks cloudstandard$1.25per Mtok in$10per Mtok out$0.13per Mtok cached$1.25per Mtok cache writeraw.githubusercontent.com · read 2026-09-16
DigitalOcean cloudstandard$1.25per Mtok in$10per Mtok out$0.12per Mtok cachedmodels.dev · read 2026-09-16
Microsoft Azure AI cloudstandard$1.25per Mtok in$10per Mtok out$0.12per Mtok cachedmodels.dev · read 2026-09-16
Nous Research aggregatorstandard$1.25per Mtok in$10per Mtok out$0.12per Mtok cachedinference-api.nousresearch.com · read 2026-09-12
OpenRouter aggregatorstandard$1.25per Mtok in$10per Mtok out$0.12per Mtok cachedopenrouter.ai · read 2026-08-24
Vercel AI Gateway aggregatorstandard$1.25per Mtok in$10per Mtok out$0.12per Mtok cachedai-gateway.vercel.sh · read 2026-08-25

Measured 4 standings

PlaceBoardMetricScore
11thof 50Metr time horizons — Epoch AIaverage_score (max)0.708
28thof 112Ale bench — Epoch AIPerformance (max)1208.83
49thof 202Terminalbench — Epoch AIAccuracy mean (max)0.604
52ndof 64Proofbench — Epoch AIAccuracy (max)9

About

GPT-5.1 Codex Max — a text model from OpenAI, sold by 6 companies from $1.25 in and $10 out per million tokens, placed 11th of 50 on Metr time horizons — Epoch AI.

It takes text, images and files and returns text, with a context window of 400,000 tokens. It was published in November 2025, trained on material up to September 2024. Its sellers say it can reason step by step and call a tool. The catalogue files it under code and agents. Six companies sell it. The cheapest is $1.25 in and $10 out per million tokens at Databricks. It has been measured on 4 boards, and stands best at 11th of 50 on Metr time horizons — Epoch AI.

Every current figure

Maker
OpenAI
Register
model
Takes
text + image + file
Returns
text
Context
400,000 tokens
Longest answer
128,000 tokens
Published
November 2025
Knowledge to
September 2024
Licence
not read
Sellers
6
Maker's own price
not read
Price
$1.25 in and $10 out per million tokens — Databricks
Boards
4
Best place
11th of 50 — Metr time horizons — Epoch AI

Known as 2 names

5.1 codex maxopenai/gpt-5.1-codex-max