Astra draws from your existing Work and Codex allowance rather than receiving a separately published fixed message quota. OpenAI documentation states that ChatGPT Plus and Business Standard include limited Astra usage, while Pro $100, Pro $200, and Business Premium can use their full existing Work and Codex allowance for Astra. Usage is governed simultaneously by a rolling 5-hour window and an account-specific weekly quota.
OpenAI has not published a universal fixed Astra message count or estimate range for either Plus or Pro. How much Astra usage you get depends directly on the task, input size, output size, reasoning settings, and whether Fast mode is used. In practice, tasks requiring complex reasoning or large context consume your 5-hour and weekly allowances noticeably faster than lighter models like GPT-5.6 Sol.
Draws from your plan's included allowance; no standalone message quota.
Pro $100 & $200 use full existing allowance; Plus includes limited usage.
OpenAI has not published an official fixed Astra message quota for Plus or Pro.
Codex CLI version 0.153.0+ required for Astra model configurations.
Astra Limits Across Subscription Plans & API Billing
Developers frequently confuse metered API rate limits (such as Tier 1–5 RPM and TPM) with ChatGPT subscription limits. This table compares how Astra usage is treated under Plus, Pro, and direct API access.
| Dimension | ChatGPT Plus ($20/mo) | ChatGPT Pro ($100 / $200/mo) | OpenAI Platform API | Source |
|---|---|---|---|---|
| Allowance Pool | Limited Astra usage drawing from existing Work and Codex allowance | Can use full existing Work and Codex allowance for Astra | Independent per-project/organization limits (RPM/TPM and monthly spend limit) | Official |
| 5-Hour Rolling Window | Shared rolling window; exact Astra message count not published | 5x or 20x more overall Codex usage than Plus; exact Astra message count not published | Not applicable (rate limited by Tier RPM and TPM) | Official (overall multiplier) / Not published (Astra count) |
| Weekly Window | Not published by OpenAI | Not published by OpenAI | Not applicable (metered monthly prepaid / org spend ceiling) | Not published |
| Behavior at Ceiling | Active turn continues subject to fair-use limits; subsequent prompts pause | Active turn continues subject to fair-use limits; subsequent prompts pause | HTTP 429 Too Many Requests response | Official |
| Cost / Billing Structure | Included in $20/mo subscription (Work & Codex surfaces) | Included in $100/mo (Pro $100) or $200/mo (Pro $200) subscription | Metered token billing ($10/M input, $50/M output standard; $20/M input, $100/M output Fast mode) | Official |
| Reset Options | 5-hour rolling recovery, weekly reset, paid instant reset (eligible personal accounts), or banked reset (if available) | 5-hour rolling recovery, weekly reset, paid instant reset (eligible personal accounts), or banked reset (if available) | Immediate upon rate limit window clear or prepaid balance top-up | Official |
Why Your Astra Allowance Disappears Faster
If you switch from lighter models like GPT-5.6 Sol or Terra to GPT-6 Astra, your remaining percentage often drops much faster per prompt. According to OpenAI documentation, the amount of Astra usage you get depends directly on five operational factors:
Multi-step engineering tasks—such as full test suite generation, multi-file refactoring, or iterative debugging loops—require more round-trips and tool calls than single-question prompts.
Large file contents, comprehensive repository structures, verbose compiler logs, and detailed code generations increase the token footprint of each interaction.
Higher reasoning effort levels allocate more internal reasoning compute to plan, verify, and self-correct solutions before emitting final responses.
Fast mode provides approximately 2× speed increases and higher execution throughput, consuming allowance capacity at an accelerated pace.
Codex enforces both a 5-hour rolling burst window and a 7-day cumulative window. A developer running multiple extended Astra sessions can easily stay below the 5-hour rolling threshold while still exhausting total weekly capacity days before the weekly reset anchor arrives.
ChatGPT Plus vs. ChatGPT Pro for Astra
Astra access and capacity scale according to plan tier:
Limited Astra Usage
- Includes limited Astra usage in ChatGPT Work and the Codex CLI during rollout.
- GPT-6 Pro in ordinary ChatGPT web chat is not included with Plus.
- 5-hour and weekly allowances exhaust faster during intensive Astra tasks.
- Eligible personal accounts can purchase paid instant weekly resets or pay-as-you-go credits in settings.
Full Existing Allowance for Astra
- Pro plans provide 5x or 20x more overall Codex usage than Plus.
- Pro $100 and Pro $200 can use their full existing Work and Codex allowance for Astra.
- Full support across Codex CLI, ChatGPT Work, and supported web surfaces.
- Qualifying accounts may receive promotional banked resets depending on specific offers and eligibility.
What OpenAI Has Not Published About Astra
In keeping with our factual accuracy standards, we explicitly distinguish between OpenAI's verified statements and what remains unpublished:
What To Do When Astra Hits Your Codex Limit
If you reach a usage limit during an active turn, Codex can continue working on that turn, subject to fair-use limits. Once that turn concludes, subsequent prompts pause until allowance is restored. You have four recovery paths:
If you hit the 5-hour rolling burst cap, capacity returns continuously as older turns age out of the 5-hour window. If you exhausted your weekly ceiling, prompts remain paused until your account's scheduled weekly reset date.
Banked resets are promotional benefits whose eligibility and expiration depend on specific offers, plans, workspaces, and accounts. If an unused banked reset is available on your account, you can apply it in Settings > Usage to refresh your 5-hour and weekly usage windows.
Eligible customers on personal ChatGPT Plus and Pro plans can purchase an instant weekly rate limit reset in Settings > Usage or via in-app banners when hitting a limit. This pulls your normal weekly cycle forward immediately. Pay-as-you-go credits can also be added where supported.
Setting an OPENAI_API_KEY environment variable instructs the Codex CLI to route requests to the OpenAI Platform API instead of your subscription. This bypasses subscription 5-hour and weekly limits, billing your API credit balance at standard token rates ($10/M input, $50/M output standard; $20/M input, $100/M output Fast mode for gpt-6-astra).
How to Check Your Remaining Codex Quota
Because Astra draws from your overall Work and Codex allowance, you can check your live 5-hour and weekly percentages in the terminal:
You can also check the official ChatGPT usage settings page or use our free local Codex Usage desktop monitoring tool to track 5-hour and weekly percentages. Note that neither OpenAI nor the local tool attributes usage specifically to Astra on a per-prompt or token level.
Frequently Asked Questions
Does GPT-6 Astra have its own separate usage quota in Codex?
Astra draws from your existing Work and Codex allowance rather than receiving a separately published fixed message quota. OpenAI states that ChatGPT Plus and Business Standard include limited Astra usage, while Pro $100, Pro $200, and Business Premium can use their full existing Work and Codex allowance for Astra. Running Astra consumes the same 5-hour and weekly allowance shared by other models in your workspace.
How many messages or prompts do I get with Astra on Plus or Pro?
OpenAI has not published a universal fixed Astra message count or estimate range for either ChatGPT Plus or ChatGPT Pro. While OpenAI provides estimated ranges for models like GPT-5.6 Sol (15–90 messages per 5 hours on Plus), no official number exists for Astra. How much usage you get depends directly on the task, input size, output size, reasoning settings, and whether Fast mode is used.
Can I use GPT-6 Astra on ChatGPT Plus?
Yes, within ChatGPT Work and the Codex CLI during rollout. OpenAI provides limited Astra usage on Plus for Work and Codex, while GPT-6 Pro in ordinary ChatGPT web chat is not included with Plus.
What is the minimum Codex CLI version required for Astra?
Codex CLI version 0.153.0 or newer is required to configure and run GPT-6 Astra. You can verify your installed version by running 'codex --version' in your terminal.
What happens if I reach a limit during an active turn?
According to OpenAI documentation, if you reach a usage limit during an active turn, Codex can continue working on that turn, subject to fair-use limits. Once that active turn concludes, subsequent prompts pause until your allowance recovers, credits are added, or an eligible reset is applied.
Does the local Codex Usage tool track Astra usage separately?
No. OpenAI does not expose model-attributed token or turn metrics through its status endpoints. The local Codex Usage tool displays your overall account-level 5-hour and weekly remaining percentages and reset times as reported by the official Codex client, covering all models in your shared pool.
How do I continue coding if Astra exhausts my weekly Codex limit?
When your allowance is exhausted, you can: (1) wait for your 5-hour rolling recovery or scheduled weekly reset, (2) apply a banked reset if one is available on your account, (3) purchase a paid instant reset or add credits in Settings > Usage (available to eligible personal Plus and Pro accounts), or (4) provide an OPENAI_API_KEY to switch to metered OpenAI Platform API billing.
Looking for general plan limits? Review the complete Codex usage limits table.
Subscribed to ChatGPT Plus? Read the full breakdown of ChatGPT Plus Codex limits.
Considering Pro tiers? Read the ChatGPT Pro Codex limits guide.
Confused about recovery timing? Read when your Codex usage resets.
Troubleshooting throttled sessions or 429 errors? See why am I rate limited in Codex.