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OpenAI: GPT-5.6 Terra

GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic...

Context
1M tokens
Input / 1M tokens
$2.50
Output / 1M tokens
$15
Benchmark
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Pricing

Input tokens$2.50 per 1M tokens
Output tokens$15 per 1M tokens
Cache read$0.25 per 1M tokens
Cache write$3.13 per 1M tokens

Technical details

Model IDopenai/gpt-5.6-terra
Context window1M tokens
Input modalitiesfile, image, text, pdf
Output modalitiestext
TokenizerGPT
Max output tokens128,000

Use with MegaBrain

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-5.6-terra',
  messages: [{ role: 'user', content: 'Hello!' }],
})

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OpenAI: GPT-5.6 Terra — MegaBrain Gateway