Models/OpenAI/GPT-5.1-Codex-Max

GPT-5.1-Codex-Max

Name: GPT-5.1-Codex-Max API access
Brand: OpenAI

DEPRECATED

OpenAI · Proprietary · Released Dec 4, 2025 · openai/gpt-5.1-codex-max

Compare Estimate cost

400K contextVisionToolsReasoningStructured outputPrompt caching

Available from 1 providerUSD / MTOK · VERIFIED 4 MINUTES AGO

EST. MONTHLY COSTclick a row for detail · click headers to sort

PROVIDER	INPUT	OUTPUT	CACHE	CONTEXT	QUANT	TTFT	TPS	UPTIME
Azure	$1.25	$10.00	$0.125	400K	—	3.4s	212 tok/s	100.0%

TTFT/TPS: median (P50) over trailing 72h · chat10k profile (~10K in / 200 out) · measured via OpenRouter routing · methodology v1.1 · measured 44 hours ago

Pricing variants · USD / MTok in / out

STANDARD

$1.25 / $10.00

per MTok in / out

CACHE READ $0.125WEB SEARCH $0.01 / search

About

GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...

Specifications

Context window400,000

Max output128,000

Modalities intext, image

Modalities outtext

LicenseProprietary

ReleasedDec 4, 2025

TokenizerGPT

Deprecation2026-07-23

GPT-5.6 Luna Pro$0.10 / $0.60 GPT-5.6 Luna$0.10 / $0.60 GPT-5.6 Terra Pro$1.00 / $6.00 GPT-5.6 Terra$1.00 / $6.00

Embed badge

[![GPT-5.1-Codex-Max](https://modelindex.ai/badge/openai/gpt-5.1-codex-max)](https://modelindex.ai/models/openai/gpt-5.1-codex-max)

Sources

OpenRouter API4 minutes ago

AGGREGATOR

LiteLLM dataset4 minutes ago

AGGREGATOR

ModelIndex benchmarks44 hours ago

MEASURED

Verified 4 minutes ago · list prices, not negotiated rates.