Model Cost Profile

OpenAI: GPT-5.1-Codex-Mini

Developer: openai

Pricing updated Mar 11, 2026

Input rank: #158Output rank: #225

Live Pricing

Input: $0.2500

Output: $2.00

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Pricing via OpenRouter API · Last synced Mar 11, 2026 · MMLU score via public benchmark data

OpenAI's GPT-5.1-Codex-Mini is designed for teams needing advanced coding assistance, capable of processing a substantial context window of 400,000 tokens to handle complex programming tasks. With input costs at $0.25 per million tokens and output costs at $2.00 per million tokens, this model offers a cost-effective solution for developers working on large-scale projects or applications requiring extensive code generation and analysis. Its efficient pricing structure allows teams to optimize their budgets while leveraging powerful AI capabilities for software development and automation.

👁 Vision🔧 Tool Calling📋 Structured Output🧠 Reasoning

Context Window

400,000

Tokens

Input Price / 1M

$0.2500

Prompt tokens

Output Price / 1M

$2.00

Completion tokens

Intelligence (MMLU)

82.0

Massive Multitask Language Understanding

Benchmark Scores

Standardized evaluation scores for OpenAI: GPT-5.1-Codex-Mini.

Benchmark	Score	Rank	Source
GPQA	81.3	#15 of 118	artificial_analysis
MMLU	82.0	#31 of 121	artificial_analysis

Side-by-Side Pricing Table

Usage Type	Price / 1M Tokens
Input (Prompt)	$0.2500
Output (Completion)	$2.00

Compare with OpenAI: GPT-5 Mini Compare with Anthropic: Claude 3 Haiku Compare with ByteDance Seed: Seed 1.6

Price History

OpenAI: GPT-5.1-Codex-Mini Pricing Trend

Input / 1M tokens0.0%Output / 1M tokens0.0%

Mar 7 — Mar 11

Current Input / 1M

$0.2500

Current Output / 1M

$2.00

Cost Calculator

Estimate monthly spend for OpenAI: GPT-5.1-Codex-Mini based on your workload.

Input tokens / month

01.0B

Output tokens / month

0500M

Estimated Monthly Cost

$30

25M input + 12M output tokens

Same Workload on Other Models

Arcee AI: Trinity Large Preview (free)$0.00−$30 Arcee AI: Trinity Mini (free)$0.00−$30 Google: Gemma 3 12B (free)$0.00−$30 Google: Gemma 3 27B (free)$0.00−$30

Cheaper Alternatives to Compare

Quick links for cost-down decisions before production rollout.

OpenAI: GPT-5.1-Codex-Mini vs Arcee AI: Trinity Large Preview (free)OpenAI: GPT-5.1-Codex-Mini vs Arcee AI: Trinity Mini (free)OpenAI: GPT-5.1-Codex-Mini vs Google: Gemma 3 12B (free)OpenAI: GPT-5.1-Codex-Mini vs Google: Gemma 3 27B (free)

FAQ

Common pricing and benchmark questions for OpenAI: GPT-5.1-Codex-Mini.

How much does OpenAI: GPT-5.1-Codex-Mini cost per 1M input tokens?

OpenAI: GPT-5.1-Codex-Mini input pricing is $0.2500 per 1M tokens based on the latest synced provider data.

How much does OpenAI: GPT-5.1-Codex-Mini cost per 1M output tokens?

OpenAI: GPT-5.1-Codex-Mini output pricing is $2.00 per 1M tokens based on the latest synced provider data.

What context window does OpenAI: GPT-5.1-Codex-Mini support?

OpenAI: GPT-5.1-Codex-Mini supports a context window of 400,000 tokens.

How can I compare OpenAI: GPT-5.1-Codex-Mini with cheaper alternatives?

Use the comparison links on this page to open direct model-vs-model pricing and benchmark pages, then evaluate monthly spend projections for your workload.