All OpenAI models

GPT-5.1-Codex-Mini

OpenAI · released November 2025

GPT-5.1-Codex-Mini is a OpenAI model with a 400K token context window — about 570 pages of text. It reads Images and Text and replies in Text. It can show its reasoning before it answers.

$0.287

input / 1M tokens

$2.30

output / 1M tokens

400K

context — about 570 pages

0.33¢

a client proposal

Pricing

Input
$0.287 per million tokens
Output
$2.30 per million tokens
Cached input
$0.035 per million tokens
Web search
1.1¢ per search

Billed from your Alyph wallet. Prices can change when the provider changes theirs — last checked August 9, 2026.

The numbers

Provider
OpenAI
Released
November 2025 (2025-11-13)
Context window
400K tokens — about 570 pages
Max output
128K tokens per reply
Input
Images and Text
Output
Text
Reasoning
Shows its thinking before answering

Cost vs Token Amount

Drag the slider to adjust the split between input and output workload.

80% Input20% Output
free$0.34$0.690 tokens250k500k750k1000k
GPT-5.1-Codex-Mini

Adjust the ratio slider to change how output tokens influence the final price for equivalent workloads.

What a task costs

2K tokens in · 500 tokens out.

GPT-5.1-Codex-Mini

OpenAI

0.17¢

for this task

33% input · 67% output

Full pricing →

Your $5 welcome credit covers about 2,898 of these.

Compare GPT-5.1-Codex-Mini

Closest in price on a typical task:

GPT-5.1-Codex-Mini vs GPT-5 Mini →GPT-5.1-Codex-Mini vs Seed 1.6 →GPT-5.1-Codex-Mini vs Seed-2.0-Lite →GPT-5.1-Codex-Mini vs DeepSeek V4 Pro →Any other combination →

Questions, answered

How much does GPT-5.1-Codex-Mini cost on Alyph?

GPT-5.1-Codex-Mini costs $0.287 per million input tokens and $2.30 per million output tokens on Alyph. A typical task — 5K tokens in, 800 out — works out to about 0.33¢. Billed from your Alyph wallet, with hard spending limits. Prices can change when the provider changes theirs; this page was last checked on August 9, 2026.

What is GPT-5.1-Codex-Mini's context window?

400K tokens — about 570 pages. Replies can be up to 128K tokens long.

Can GPT-5.1-Codex-Mini read images and files?

GPT-5.1-Codex-Mini reads Images and Text. Drop a file onto the canvas and it becomes part of the context — the only limit is the context window.

Does GPT-5.1-Codex-Mini show its reasoning?

Yes. GPT-5.1-Codex-Mini can expose its thinking before the final answer, so you can watch how it got there.

Test GPT-5.1-Codex-Mini against GPT-5 Mini

One prompt, both models at the same time, the better answer wins. Free to start, with $5 of credit.

Sign up free Try the demo