GPT-5.1 Codex Max

openai/gpt-5.1-codex-max

Maker: OpenAI, United States
Released: 2025-11-13
Knowledge cutoff: 2024-09-30
Family: gpt-codex
Weights: closed
Tasks: text.chat, text.reasoning, code, vision.understand, vision.extract
Cheapest offering: Azure OpenAI, about $0.00425 for a typical text.chat call

Try it in the sandbox Use it from the API

Offerings

Provider	Model id at the provider	Status	Price per 1M tokens	Per-unit prices	Limits	Capabilities (level)
Azure OpenAI	`gpt-5.1-codex-max`	gadeprecated 2027-05-18	Input: $1.25 Output: $10 Cache read: $0.125 Since 2026-11-03 · models.dev, MIT	none	Context: 400,000 tokens Max input: 272,000 tokens Max output: 128,000 tokens	`input.text` claimed `input.image` claimed `input.pdf` claimed `output.text` claimed `tools` claimed `structured_output` claimed `reasoning` claimed `parallel_tools` claimed `tool_choice` claimed `prompt_caching` claimed
OpenRouter	`openai/gpt-5.1-codex-max`	ga	Input: $1.25 Output: $10 Cache read: $0.125 Since 2026-11-03 · models.dev, MIT	none	Context: 400,000 tokens Max input: 272,000 tokens Max output: 128,000 tokens	`input.text` claimed `input.image` claimed `input.pdf` claimed `output.text` claimed `tools` claimed `structured_output` claimed `reasoning` claimed

Quality scores

Basis	Score (0–1)	Raw	Measured	Source
`epoch:terminal_bench`	0.714	0.6045	2025-11-19	Epoch AI, CC-BY-4.0, normalized by Nanner Tech

Aliases

Other names the API accepts for this model.

gpt-5.1-codex-max

Use it from the API

Look this model up, or ask for the best model for its task on the providers that offer it. See the quickstart and the API reference.

Look up this model

curl 'https://rhumbdata.com/v1/models/openai/gpt-5.1-codex-max' \
  -H "Authorization: Bearer $RHUMB_KEY"

Resolve text.chat on its providers

curl 'https://rhumbdata.com/v1/resolve?task=text.chat&providers=azure-openai,openrouter' \
  -H "Authorization: Bearer $RHUMB_KEY"

Built from catalog version 2026-11-04.3 of 2026-11-04. Prices are list prices per 1M tokens unless marked otherwise; every score shows its source's notice (see Attributions).