GPT 5.1 Codex API Pricing 2026

Compare pricing, benchmarks, and providers for GPT 5.1 Codex. Find the best value for your use case.

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Last updated: February 15, 2026 at 08:07 AM

Overview

GPT 5.1 Codex was released on November 13, 2025. Pricing starts at $1.25 per million input tokens and $10.00 per million output tokens. The model supports a context window of up to 400K tokens. API access is available through OpenAI.

Context Window

400K

tokens

Pricing

Input$1.25

Output$10.00

Cached$0.125

per 1M tokens

Speed

Output166 tok/s

TTFT15.87s

median latency

Capabilities

VisionToolsCaching

Pricing Comparison

Compare GPT 5.1 Codex with 10 similar models by price.

Current Pricing (per 1M tokens)

11 models

Provider	Model	Input $/M	Output $/M	Coding	MMLU	GPQA	Context	Actions
O OpenAI	GPT-5.1-Codex	$1.250	$10.000	84.9	86.0	86.0	400,000	Try
O OpenAI	o4 Mini	$1.100	$4.400	85.9	83.2	78.4	200,000	Try
O OpenAI	o3 Mini High	$1.100	$4.400	73.4	80.2	77.3	200,000	Try
O OpenAI	o3 Mini	$1.100	$4.400	71.7	79.1	74.8	200,000	Try
QW Qwen	Qwen3 Max Thinking	$1.200	$6.000	—	—	—	262,144	Try
M Nvidia	Llama 3.1 Nemotron 70B Instruct	$1.200	$1.200	16.9	69.0	46.5	131,072	Try
QW Qwen	Qwen3 Max	$1.200	$6.000	76.7	84.1	76.4	262,144	Try
G Google	Gemini 2.5 Pro Preview 05-06	$1.250	$10.000	77.0	83.7	82.2	1,048,576	Try
O OpenAI	GPT-5.1-Codex-Max	$1.250	$10.000	—	—	—	400,000	Try
O OpenAI	GPT-5.1	$1.250	$10.000	49.4	80.1	64.3	400,000	Try
O OpenAI	GPT-5.1 Chat	$1.250	$10.000	—	—	—	128,000	Try

* Some models use tiered pricing based on prompt length. Displayed prices are for prompts ≤ 200k tokens.

Compare Providers

GPT 5.1 Codex is available from multiple providers with different pricing and availability.

Providers

$1.250

Cheapest Input/M

$10.000

Cheapest Output/M

OpenAI

Best Price

Provider Pricing

2 models

Provider	Input $/M	Output $/M	Uptime
OpenAI Best Price	$1.250	$10.000	100.0%
A Azure Best Price	$1.250	$10.000	-

Provider pricing data sourced from OpenRouter and Helicone

Community Rankings

How does GPT 5.1 Codex perform? Vote based on your experience.

Cost vs. Quality

Compare GPT 5.1 Codex's benchmark performance against all models.

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GPT-5.1-Codex

Other models

Detailed Benchmark Scores

Intelligence

42.2 (94th pct)

Coding

36.6 (90th pct)

Math

95.7 (96th pct)

MMLU Pro

86.0 (91th pct)

GPQA

86.0 (95th pct)

LiveCodeBench

84.9 (94th pct)

AIME

Aider

Benchmark data from Artificial Analysis and HuggingFace Open LLM Leaderboard

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