How to Use ChatGPT 100 (Pro 100): Setup, Limits and Best Uses

“ChatGPT 100” is the $100-a-month Pro 100 plan, the entry tier of ChatGPT Pro. You use it like any other ChatGPT account: upgrade from the Pricing page or Settings → My Plan, then keep working in ChatGPT and Codex with much higher limits than Plus, but with a weekly cap you should learn to watch.

Below is what the plan includes as of October 2026, how to set it up, how its limits work, and when one of the other tiers makes more sense. OpenAI has changed these plans several times this year, so treat specific numbers as a snapshot.

What ChatGPT Pro 100 is

OpenAI introduced the $100 tier on April 9, 2026, slotting it between the $20 Plus plan and the $200 Pro plan, according to TechCrunch and 9to5Mac. Coverage at launch framed it as a plan for heavy Codex users, and as OpenAI’s answer to Anthropic’s $100 Claude option.

The key points from launch coverage and OpenAI’s own help page:

• Usage: about 5x the usage of Plus. OpenAI stated this multiple in its announcements; the Help Center page on Pro tiers itself describes the tiers but, according to some reviewers, does not print a multiple.
• Features: the same core Pro features as the more expensive tiers. The Help Center lists Pro models, Codex, deep research, image creation, memory and file uploads. Thurrott reported that the $100 and $200 plans mainly differ in usage limits, not features.
• Launch promotion: Codex usage was temporarily raised to 10x Plus through May 31, 2026. That promotion has ended, so the plan is back to the standard allowance.

How to get Pro 100

1. Sign in to ChatGPT on the web or in the official app.
2. Open the Pricing page, or go to Settings → My Plan.
3. Choose the Pro 100 tier (shown at $100 per month in USD; local pricing and taxes may differ).
4. Confirm payment through OpenAI’s checkout. According to the Help Center, the new limits apply right after you pick a Pro plan.

If you are already on a Pro tier, the Help Center says you can switch between Pro tiers from the same Settings → My Plan screen. Only upgrade through OpenAI’s own site or the official app stores; shared or resold “Pro accounts” are against OpenAI’s terms and put your data at risk.

How Pro 100 limits work

This is the part that trips most people up.

No five-hour window, but a weekly cap

Third-party trackers and OpenAI’s pricing information agree that Pro plans currently have no five-hour limit. Instead, there is a weekly allowance. OpenAI does not publish the exact weekly number, so nobody outside OpenAI can tell you precisely how many messages or Codex tasks you get.

Separate pools

Reported details suggest usage is split into separate pools: one for agentic work and Codex, and a separate weekly allowance for the top “Pro” reasoning models in chat. One comparison site reports that on Pro 100, the GPT-6 Pro and GPT-5.6 Sol Pro models share a single weekly allowance. We could not confirm a published message count for that pool, so treat any specific number you see online with caution.

When you hit the limit

The Help Center says reaching a model’s allowance does not end or pause your subscription, and there is no setting to raise or bypass the allowance. In practice you either wait for the weekly reset, switch to a model that still has room, or move up a tier.

Checking your usage

Since the weekly cap is unpublished, the most useful habit is to measure your own pace.

1. In the Codex CLI, run /status during a session. Several guides report it shows your remaining quota and reset time.
2. In ChatGPT or the desktop app, look under Settings for a usage section. Third-party guides disagree on the exact web address of the usage dashboard, so navigate from Settings rather than relying on a copied link.
3. After one normal week of work, compare how much of the allowance you used. That tells you far more than any published multiple.

Pro 100 vs the other tiers (October 2026)

At OpenAI DevDay on September 29, 2026, OpenAI added a $500 tier and reopened the $200 tier with a smaller allowance, as reported by The Next Web and Android Headlines. Here is how the plans line up based on that reporting:

A few notes on that table:

• Pro 200 changes: The reduced 10x allowance applies from October 30, 2026. Existing Pro 200 subscribers were reported to keep their old limits until October 29 and to receive a one-time credit grant. If you are on Pro 200, check OpenAI’s notice in your account for your exact terms.
• Pro 500 figures: The 25x figure comes from secondary reporting. OpenAI’s Help Center describes Pro 500 as the tier with the highest included usage and the only one with Ultrafast, which reports describe as generating tokens up to eight times faster in Codex.
• Pricing logic: On the reported multiples, Pro 100 gives the most usage per dollar of the Pro tiers. That is a calculation from reported figures, not an OpenAI claim.

Getting the most out of Pro 100

A few practical habits make the plan go further:

• Match the model to the job. Save the top Pro reasoning models for hard problems, long documents or tricky code. Use the standard Instant or Thinking models for quick questions and drafts so you do not burn the scarcer Pro allowance.
• Use Codex for longer coding tasks. Pro 100 was built around Codex usage. Delegating multi-step tasks such as refactors, test writing or bug hunts is where the extra allowance pays off.
• Use deep research sparingly and deliberately. Write a precise brief (scope, time period, what to compare, output format) so one run gives you what you need.
• Turn on memory and custom instructions if you work on the same projects often, so you spend fewer messages re-explaining context.
• Check usage midweek. If you are on track to run out by Wednesday, adjust early rather than getting blocked mid-task.

Should you choose Pro 100?

Pro 100 makes sense if you regularly hit Plus limits, especially in Codex, but do not need Ultrafast or the very highest caps. If you rarely see a limit message on Plus, stay there. If Pro 100 still runs out every week, compare the cost of moving up a tier against simply waiting for resets.

All prices, multiples and model names above reflect reporting as of October 2026. OpenAI has adjusted its Pro plans several times this year, so check the Help Center article on Pro tiers and the Pricing page in your account before you upgrade.