OpenAI details ChatGPT-o3, o4-mini, o4-mini-high usage limits

OpenAI has launched three new reasoning models – o3, o4-mini, and o4-mini-high for Plus and Pro subscribers, but as it turns out, these models also have usage limitations.

In a support document, OpenAI shed light on how you can use ChatGPT’s three new reasoning models.

If you subscribe to ChatGPT Plus, you’ll get up to 50 messages per week for the o3 model, which is the most powerful reasoning model.

On the other hand, o4-mini offers 150 messages per day and o4-mini-high (best for coding) offers 50 messages per day.

These limitations are only for the most popular ChatGPT $20 Plus plan.

If you upgrade to ChatGPT Pro, which costs $200 per month, you’ll get “near unlimited” access.

OpenAI calls the Pro plan “near unlimited” because you might still hit usage limits in certain cases—such as when your activity appears artificial or violates OpenAI’s terms and conditions, which include:

• Abusive usage, such as automatically or programmatically extracting data.

• Sharing your account credentials or making your account available to anyone else.

• Reselling access or using ChatGPT to power third-party services.

“We have guardrails in place to help prevent misuse and are always working to improve our systems,” OpenAI noted in the support document.

“This may occasionally involve a temporary restriction on your usage.”

If you’re on a free plan, you can only try the o4-mini reasoning model by selecting the reason button.

Other models are not available for free users.