OpenAI has made GPT-6 Astra available to all ChatGPT users on Pro, Enterprise, and Business Premium plans through ChatGPT Work and Codex.

The standard version of GPT-6 Astra offers about half as many messages per five-hour window：https://learn.chatgpt.com/docs/pricing as GPT-5.6 Sol across all plans. Plus users get an estimated 5 to 45 local messages with Astra, compared to 10 to 100 with Sol. On the Pro 20x plan, that's 100 to 900 for Astra versus 200 to 2,000 for Sol. Ad

Actual usage depends on model choice, context length, reasoning, tool use, and caching, according to OpenAI. Users on the Free and Go tiers don't have access to the frontier models GPT-5.6 Sol and GPT-6 Astra. Ad

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