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GPT 5.6 Terra

GPT 5.6 Terra is the balanced model of the GPT-5.6 family, built for everyday production work with performance comparable to the previous generation at a lower price, stronger agentic coding, biology, and cybersecurity results, and a context window of 1.1M tokens. Your use is subject to OpenAI's Terms & Privacy Policies.

ReasoningWeb SearchFile InputTool UseVision (Image)Implicit CachingWebsockets
Use with AI GatewayView docs
import { streamText } from 'ai'


const result = streamText({
  model: 'openai/gpt-5.6-terra',
  prompt: 'Why is the sky blue?'
})
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About GPT 5.6 Terra

GPT 5.6 Terra became available on AI Gateway on July 9, 2026 as the balanced model of the GPT-5.6 family, alongside GPT-5.6 Sol and GPT-5.6 Luna. All three GPT-5.6 models handle agentic work across coding, biology, and cybersecurity better than the previous generation, and all three use fewer tokens to reach an answer.

OpenAI describes GPT 5.6 Terra as the GPT-5.6 model that balances intelligence and cost, and it maps to the mini tier of earlier GPT-5 families. Performance compares to the previous generation at a lower price, so GPT 5.6 Terra is a practical default for everyday production traffic: application features, internal tooling, support automation, and the routine steps of a longer agent run.

GPT 5.6 Terra accepts text and image input and returns text, with a context window of 1.1M tokens and up to 272K tokens of output per request. Reasoning tokens, streaming, function calling, and structured outputs are supported, and the Responses API adds web search, file search, code interpreter, computer use, and MCP (Model Context Protocol) tools.

Set the model to openai/gpt-5.6-terra in the AI SDK, the Chat Completions API, the Responses API, or another supported API format, from TypeScript or Python. AI Gateway routing rules can rewrite an existing model slug to openai/gpt-5.6-terra when you want to move traffic without touching application code. List pricing is $2 per million input tokens and $12 per million output tokens, with cached input at $0.2. Upstream list prices came down after launch, and AI Gateway mirrors provider pricing with no markup and adds no platform fee on inference, including for Bring Your Own Key requests.