GPT-6 on Vertex AI is private preview only and can't use the $300 credit

Google added three closed OpenAI models to Vertex AI Model Garden: GPT-6 Astra, GPT-6.1 Sol and GPT-6 Luna, but only in private preview for select enterprise customers. The $300 free trial credit can't pay for them because partner models are sold through Marketplace, which trial accounts can't use, and no model IDs or prices have been published.

• GPT-6 Astra, 6.1 Sol and 6.1 Luna are private preview only on Vertex AI
• The $300 trial credit can't cover Marketplace partner models
• Google has published no GPT-6 model IDs, regions or prices
• Only gpt-oss-120b-maas is callable via the OpenAI SDK today