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OpenAI: GPT-5.1-Codex-Mini API Pricing

OpenAI: GPT-5.1-Codex-Mini is an API model from openai. It costs $0.25 per 1M input tokens and $2 per 1M output tokens, with cached input at $0.03. Its context window is 400,000 tokens with up to 128,000 output tokens. A workload of 10M input + 2M output tokens costs about $6.5 per month.

Input

$0.25

per 1M tokens

Output

per 1M tokens

Cached input

$0.03

per 1M tokens

Context window

400K

400,000 tokens

Blended (80/20)

$0.6

per 1M tokens

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex

How much does OpenAI: GPT-5.1-Codex-Mini cost for a real workload?

At 10M input + 2M output tokens per month, OpenAI: GPT-5.1-Codex-Mini costs about $6.5 ($2.5 input + $4 output). Try your own volumes in the cost calculator.

What are cheaper alternatives to OpenAI: GPT-5.1-Codex-Mini?

Qwen: Qwen3 VL 235B A22B Instruct — $0.21 in / $1.9 out per 1M
Relace: Relace Apply 3 — $0.85 in / $1.25 out per 1M
AionLabs: Aion 3.5 Mini — $0.7 in / $1.4 out per 1M
AionLabs: Aion-3.0-Mini — $0.7 in / $1.4 out per 1M
Qwen: Qwen3.5 Plus 2026-04-20 — $0.3 in / $1.8 out per 1M
Mistral: Mistral Large 3 2512 — $0.5 in / $1.5 out per 1M

Where to run OpenAI: GPT-5.1-Codex-Mini

AI/ML API: one API key for 400+ models, including most models tracked here · Novita AI: pay-as-you-go APIs for open models (DeepSeek, Qwen, Llama and more) plus GPU cloud. Prices there follow each platform's own catalog and can differ from the list prices tracked here.

Run it on AI/ML API →Run it on Novita AI →

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Compare OpenAI: GPT-5.1-Codex-Mini with other models

OpenAI: GPT-5.1-Codex-Mini vs OpenAI: gpt-oss-20bOpenAI: GPT-5.1-Codex-Mini vs OpenAI: gpt-oss-20b (batch)OpenAI: GPT-5.1-Codex-Mini vs OpenAI: gpt-oss-120b (batch)OpenAI: GPT-5.1-Codex-Mini vs OpenAI: GPT-5 Nano (batch)OpenAI: GPT-5.1-Codex-Mini vs OpenAI: GPT-4.1 Nano (batch)OpenAI: GPT-5.1-Codex-Mini vs OpenAI: GPT-6 Luna Pro (batch)

Frequently asked questions

How much does OpenAI: GPT-5.1-Codex-Mini cost?

OpenAI: GPT-5.1-Codex-Mini costs $0.25 per 1M input tokens and $2 per 1M output tokens (list price, snapshot October 22, 2026). At 10M input + 2M output tokens per month that is about $6.5.

What is the context window of OpenAI: GPT-5.1-Codex-Mini?

OpenAI: GPT-5.1-Codex-Mini has a context window of 400,000 tokens and can return up to 128,000 output tokens per response.

What are cheaper alternatives to OpenAI: GPT-5.1-Codex-Mini?

Cheaper models include Qwen: Qwen3 VL 235B A22B Instruct ($0.21 in / $1.9 out), Relace: Relace Apply 3 ($0.85 in / $1.25 out), AionLabs: Aion 3.5 Mini ($0.7 in / $1.4 out). See the full list on this page.

Is OpenAI: GPT-5.1-Codex-Mini free to use?

No. OpenAI: GPT-5.1-Codex-Mini is a paid model at $0.25 input / $2 output per 1M tokens. 21 free models are listed on the free models page.

Provider: openai · Model ID: openai/gpt-5.1-codex-mini · Modality: text+image->text · Price snapshot October 22, 2026, refreshed daily. How we collect prices