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…