Models/OpenAI/GPT-5.1-Codex

GPT-5.1-Codex

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

DEPRECATED

OpenAI · Proprietary · Released Nov 13, 2025 · openai/gpt-5.1-codex

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	$0.13	400K	—	1.3s	147 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 $0.13WEB SEARCH $0.01 / search

About

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....

Specifications

Context window400,000

Max output128,000

Modalities intext, image

Modalities outtext

LicenseProprietary

ReleasedNov 13, 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](https://modelindex.ai/badge/openai/gpt-5.1-codex)](https://modelindex.ai/models/openai/gpt-5.1-codex)

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.