GPT-5.6 family and Grok 4.5 join Agent API

Agent API: New Models

The Agent API added support for several new models this month, all with direct first-party token pricing.

• GPT-5.6 Family — openai/gpt-5.6-sol, openai/gpt-5.6-terra, and openai/gpt-5.6-luna, the latest GPT-5.6 models.
• Grok 4.5 — xai/grok-4.5, xAI's flagship coding and agentic model.

See the full list in the Agent API Models reference.