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

Best $1.25 in / $10.00 out via Azure

Compare Estimate cost

400K contextVisionToolsReasoningStructured outputPrompt caching

Available from 1 providerUSD / MTOK · PRICES 23 MINUTES AGO · SPEED 9 DAYS 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	—	3.4s	357 tok/s	100.0%

TTFT/TPS: median (P50) over trailing 504h · chat10k profile (~10K in / 200 out) · measured via OpenRouter routing · methodology v1.1 · measured 9 days ago

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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-6.1 Sol Pro$2.00 / $10.00 GPT-6.1 Sol$2.00 / $10.00 GPT-6 Luna Pro$0.10 / $0.50 GPT-6 Luna$0.10 / $0.50

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 API23 minutes ago

AGGREGATOR

LiteLLM dataset23 minutes ago

AGGREGATOR

ModelIndex benchmarks9 days ago

MEASURED

Verified 23 minutes ago · list prices, not negotiated rates.