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GPT-5 Nano
openai/gpt-5-nanoGPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger...
Context
400K tokens
Input, 1M tokens
$0.03
Output, 1M tokens
$0.23
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$0.03 per 1M tokens
Output tokens$0.23 per 1M tokens
Cache read$0 per 1M tokens
Apps and activity
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Technical details
Model IDopenai/gpt-5-nano
Context window400K tokens
AcceptsText, Images, Files, 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-nano',
messages: [{ role: 'user', content: 'Hello!' }],
})Start using GPT-5 Nano
Create a free account, get a key in your dashboard and send your first request. Top up your balance when you need it.