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GPT 5.6 Sol, Luna, Terra Models Now Available on AI Gateway

·2026.07.09 09:00

Key point

OpenAI's three GPT 5.6 models have been released in limited preview on AI Gateway.

Details

OpenAI's GPT 5.6 has been released in limited preview on AI Gateway as three models: Sol, Terra, and Luna. These models feature enhanced Agentic work performance in coding, biology, and cybersecurity, along with improved token efficiency compared to the previous generation.

The characteristics of each model are as follows:

  • Sol (openai/gpt-5.6-sol): The flagship model with the most powerful performance
  • Terra (openai/gpt-5.6-terra): A general-purpose model that maintains performance similar to the previous generation while cutting costs in half
  • Luna (openai/gpt-5.6-luna): The cheapest and fastest model in the series

Users can start using these models right away by setting the model slug in the AI SDK, and can also switch from existing models to GPT 5.6 without code changes via Routing Rules. AI Gateway provides various management features including a unified API, usage and cost tracking, and retry and failover configuration.

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