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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.

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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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Frequently Asked Questions

  • What is GPT 5.6 Terra built for?

    Everyday production work. OpenAI designed GPT 5.6 Terra to balance intelligence and cost, which puts it between the GPT-5.6 Sol flagship and the low-cost GPT-5.6 Luna tier.

  • How does GPT 5.6 Terra compare with the previous generation?

    Performance compares to the previous generation at a lower price, and GPT 5.6 Terra handles agentic coding, biology, and cybersecurity work better. It also reaches answers in fewer tokens.

  • What context window and output limit does GPT 5.6 Terra support?

    1.1M tokens, with up to 272K tokens of output per request, matching the rest of the GPT-5.6 family.

  • What inputs does GPT 5.6 Terra accept?

    Text and images, with text output. Audio and video input are not supported, so route voice work to the gpt-realtime family instead.

  • Which APIs can I use to call GPT 5.6 Terra?

    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. AI Gateway accepts each format and routes the request.

  • When should I escalate from GPT 5.6 Terra to GPT-5.6 Sol?

    Escalate when the balanced tier misses on your hardest prompts. Log the turns where GPT 5.6 Terra falls short, retry those against GPT-5.6 Sol, and route only that traffic to the flagship.

  • What does GPT 5.6 Terra cost?

    List pricing is $2 per million input tokens and $12 per million output tokens, with cached input at $0.2. Short-context and long-context requests are priced separately, and AI Gateway mirrors provider pricing with no markup.

  • Does GPT 5.6 Terra support zero data retention through AI Gateway?

    Yes, Zero Data Retention is available for this model. Zero Data Retention is offered on a per-provider basis. See https://vercel.com/docs/ai-gateway/capabilities/zdr for details.

  • What are typical latency characteristics?

    This page shows live throughput and time-to-first-token metrics measured across real AI Gateway traffic.