OpenAI has made GPT-6 Astra available to ChatGPT Pro, Enterprise, and Business Premium subscribers through ChatGPT Work and Codex, with Plus and Business tier access arriving in the coming days. The model is also live on the OpenAI API, Microsoft Azure, and AWS Bedrock, and it ships at roughly half the per-window message allowance of GPT-5.6 Sol across every plan tier.
What GPT-6 Astra is and where it runs
GPT-6 Astra is the newest frontier model in the GPT-6 family, offered alongside the previously available GPT-5.6 Sol, GPT-5.6 Terra, and GPT-5.6 Luna tiers. Subscribers on the Pro, Business, and Enterprise plans get the more capable GPT-6 Astra Pro variant in addition to the standard release.
Astra is reachable through four entry points:
- ChatGPT, including ChatGPT Work and Codex
- The OpenAI API
- Microsoft Azure
- AWS Bedrock
Pro plan quotas for GPT-6 Pro
Pro, Business, and Enterprise subscribers all count GPT-6 Astra Pro usage against their existing subscription quotas. The two paid Pro tiers differ sharply in headroom.
- The $200 Pro plan includes 200 messages per week for GPT-6 Pro, on top of a separate 170 messages per day for GPT-5.6 Sol Pro. Combined daily use of both models is capped at 200 messages per day.
- The $100 Pro plan receives 50 messages per week drawn from a single shared allowance that covers GPT-6 Pro and GPT-5.6 Sol Pro together.
Business Premium users also receive 50 messages per week from the same shared pool, while Business Standard users are limited to 15 messages per month across both models.
How standard Astra compares to GPT-5.6 Sol across plans
The standard version of GPT-6 Astra delivers about half as many messages per five-hour window as GPT-5.6 Sol, regardless of plan. Plus subscribers can expect roughly 5 to 45 local messages with Astra, against 10 to 100 with Sol. On the high end, Pro 20x subscribers see 100 to 900 messages for Astra compared with 200 to 2,000 for Sol.
| Model | Plus | Pro 5x | Pro 20x | Standard Business |
|---|---|---|---|---|
| GPT-6 Astra | 5-45 | 25-225 | 100-900 | 5-45 |
| GPT-5.6 Sol | 10-100 | 50-500 | 200-2,000 | 10-100 |
| GPT-5.6 Terra | 25-200 | 125-1,000 | 500-4,000 | 25-200 |
| GPT-5.6 Luna | 250-2,000 | 1,250-10,000 | 5,000-40,000 | 250-2,000 |
| GPT-5.5 | 15-80 | 75-400 | 300-1,600 | 15-80 |
OpenAI notes that actual consumption varies based on the choices a user makes: model selection, context length, reasoning demands, tool use, and caching behavior all shift the count in either direction.
Which plans miss Astra entirely
Users on the Free and Go tiers do not have access to either of the two frontier models, GPT-5.6 Sol or GPT-6 Astra. Those tiers remain limited to lighter models such as GPT-5.5 and earlier.
What this means for subscribers picking a plan
Teams choosing where to land on the new lineup can weigh three concrete levers: raw weekly message volume, the Pro variant’s separate quota, and how much Astra-specific work each seat needs to absorb. The doubled-or-nothing gap between the $100 and $200 Pro tiers, the 15-message monthly cap on Business Standard, and the shared-pool structure on every plan below the $200 Pro tier all push heavier Astra users toward the top of the pricing ladder.
FAQ
What is GPT-6 Astra?
GPT-6 Astra is OpenAI’s newest frontier large language model, now available to ChatGPT Pro, Enterprise, and Business Premium users through ChatGPT, the OpenAI API, Microsoft Azure, and AWS Bedrock.
How does GPT-6 Astra’s message allowance compare to GPT-5.6 Sol?
The standard GPT-6 Astra offers roughly half as many messages per five-hour window as GPT-5.6 Sol on every plan tier. For example, Plus subscribers get 5 to 45 messages with Astra versus 10 to 100 with Sol.
Which ChatGPT plans get access to GPT-6 Astra?
Pro, Enterprise, and Business Premium subscribers get access immediately through ChatGPT Work and Codex, with Plus and Business users gaining access in the coming days. Free and Go tier users do not have access to either GPT-5.6 Sol or GPT-6 Astra.
Related coverage
- GPT-5.6 Launches Tomorrow: Sol, Terra, Luna | July 9
- OpenAI ChatGPT superapp plans and listing
- OpenAI releases GPT-6 Astra
This article summarizes reporting from the-decoder.com. See our editorial disclaimer for how our articles are produced.
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