GPT 5.6 Sol, Luna, and Terra now available on AI Gateway

GPT 5.6 is now available on AI Gateway in three models: Sol, Terra, and Luna.

GPT 5.6 from OpenAI is now available on AI Gateway in a limited preview, across three models: Sol, Terra, and Luna. All three are stronger at agentic work across coding, biology, and cybersecurity, and are more token-efficient than the previous generation.

• Sol (openai/gpt-5.6-sol): the flagship, and the most capable of the three.

• Terra (openai/gpt-5.6-terra): a balanced model for everyday work, with performance comparable to the previous generation at half the cost.

• Luna (openai/gpt-5.6-luna): a fast, affordable model with strong capability at the lowest cost in the series.

To use GPT 5.6, set model to one of the above slugs in the AI SDK:

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import { streamText } from 'ai';
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const result = streamText({
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  model: 'openai/gpt-5.6-sol',
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  prompt: 'Investigate the failing tests and open a PR with a fix.',
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});

You can also set routing rules to switch to GPT 5.6 from other gateway models without touching your code.

vercel ai-gateway rules add \
  --type rewrite \
  --source openai/gpt-5.5 \
  --destination openai/gpt-5.6-sol

AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations for higher-than-provider uptime. It includes built-in custom reporting, Zero Data Retention support, budgets for API keys, routing rules, and more.

AI Gateway reflects provider pricing with no markup and does not charge a platform fee on inference, including on Bring Your Own Key (BYOK) requests.

Try GPT 5.6 in the model playground.