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:

import { streamText } from 'ai';

const result = streamText({

model: 'openai/gpt-5.6-sol',

prompt: 'Investigate the failing tests and open a PR with a fix.',

});

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.

AI Gateway: Track top AI models by usage

The AI Gateway model leaderboard tracks the most popular models over time, ranking them by the total volume of tokens processed across all Gateway traffic.

View the leaderboard