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GPT-5.1-Codex
openai/gpt-5.1-codexGPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Context
400K tokens
Input, 1M tokens
$1.44
Output, 1M tokens
$12
Benchmark
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Uptime and speed
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Pricing
Charged from your prepaid balance for the tokens actually used.
Input tokens$1.44 per 1M tokens
Output tokens$12 per 1M tokens
Cache read$0.15 per 1M tokens
Apps and activity
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Technical details
Model IDopenai/gpt-5.1-codex
Context window400K tokens
AcceptsText, Images, pdf
ProducesText
TokenizerGPT
Max output tokens128,000
How to connect
The API is OpenAI-compatible: the official SDKs, LangChain and any client with a "base URL" field work.
import OpenAI from 'openai'
const client = new OpenAI({
baseURL: 'https://getmegabrain.com/api/gateway/v1',
apiKey: process.env.MEGABRAIN_API_KEY,
})
const response = await client.chat.completions.create({
model: 'openai/gpt-5.1-codex',
messages: [{ role: 'user', content: 'Hello!' }],
})Start using GPT-5.1-Codex
Create a free account, get a key in your dashboard and send your first request. Top up your balance when you need it.