OpenAI Code Popular

GPT-5.1 Codex Mini

Lightweight code-optimized model

256K Context window

Text Modalities

Code-tuned Specialty

Yes Streaming

Get API key — free View docs →

Model ID gpt-5.1-codex-mini /v1/chat/completions

Our pricing

Input tokens per 1M tok

$0.200

Output tokens per 1M tok

$1.60

Pay-as-you-go · No minimums · Cancel anytime

OpenAI-compatible ( api.belugapi.com/v1)

Start for free →

No credit card required to test

Capabilities

What GPT-5.1 Codex Mini
can do for you.

Native API parity with the official provider — every feature surfaced one-to-one.

Streaming

Server-sent events out of the box

Long context

200K+ tokens of working memory

Integration

2-line migration.
Zero friction.

BelugAPI is 100 % compatible with the OpenAI SDK. Point base_url to our endpoint and you're done — no refactoring, no learning curve.

Same request & response schema

Python · Node.js · REST · Go · Ruby

Streaming, tool-calling, structured output

Automatic failover & load balancing

Python

from openai import OpenAI

client = OpenAI(
  api_key=bel-your-key,
  base_url=https://api.belugapi.com/v1
)

response = client.chat.completions.create(
  model=gpt-5.1-codex-mini,
  messages=[{"role": user, "content": Hello!}]
)
print(response.choices[0].message.content)

Node.js

import OpenAI from openai;

const client = new OpenAI({
  apiKey:  bel-your-key,
  baseURL: https://api.belugapi.com/v1,
});

const res = await client.chat.completions.create({
  model:    gpt-5.1-codex-mini,
  messages: [{ role: user, content: Hello! }],
});
console.log(res.choices[0].message.content);

cURL

curl https://api.belugapi.com/v1/v1/chat/completions \
  -H Authorization: Bearer bel-your-key \
  -H Content-Type: application/json \
  -d {"model":"gpt-5.1-codex-mini","messages":[{"role":"user","content":"Hello!"}]}

Highlights

Built for production.

Code generation

Fast

Complete guide

Everything about
GPT-5.1 Codex Mini.

Specifications, pricing, capabilities, and integration tips — kept up to date with every OpenAI release.

By OpenAI 2 min read Updated May 2026

Lightweight code-optimized model

Overview

GPT-5.1 Codex Mini is a cutting-edge code generation ai developed by OpenAI, designed to push the boundaries of artificial intelligence-powered content generation.

This model excels in code generation, fast, making it a top choice for professionals seeking high-quality, scalable AI solutions. Whether you're building production applications, researching new AI capabilities, or creating stunning visual content, GPT-5.1 Codex Mini delivers industry-leading performance and reliability.

Key Specifications

Specification	Details
Model Name	GPT-5.1 Codex Mini
Provider	OpenAI
Category	Code Generation AI
Model Type	Code

Pricing

Input: $0.2/M tokens
Output: $1.6/M tokens

Key Features & Capabilities

Code Generation: Advanced capability for professional-grade output.
Fast: Advanced capability for professional-grade output.

Use Cases & Applications

Automated code generation
Bug detection and debugging
Code review automation
Developer productivity tools

Frequently asked questions

What is GPT-5.1 Codex Mini best used for?

GPT-5.1 Codex Mini excels at code generation, fast, making it ideal for professional and enterprise applications.

Who developed GPT-5.1 Codex Mini?

GPT-5.1 Codex Mini was developed by OpenAI, a leading AI research and development company.

How do I integrate GPT-5.1 Codex Mini into my application?

You can integrate GPT-5.1 Codex Mini via its official API endpoint using standard HTTP requests with your API key. SDKs are available for Python, JavaScript, and other languages.

What is the pricing model for GPT-5.1 Codex Mini?

Pricing is based on input. Check the pricing section above for detailed rates.

Ready to ship? Start using GPT-5.1 Codex Mini in under 30 seconds.

Get free API key