Error 429

When using the OpenAI API through our Microsoft Excel add-in "ChatGPT for Excel", you may encounter error 429. The add-in requires credits on your OpenAI account or an active monthly billing plan.

Types of Error 429

Error 429 can occur for two main reasons:

  1. insufficient_quota - quota exceeded or credits depleted
  2. rate_limit_exceeded - requests per minute limit exceeded

Reason Solution

Check Balance and Credits

Credits have run out or billing is not set up


  • Check your balance in the usage dashboard
  • Add payment information in the Billing section
  • Ensure you have active credits or monthly billing set up

Important: As of 2025, new users may not receive automatic free credits. Often, adding a payment method is required immediately.

API Key Issue

API key was created BEFORE adding a payment method

  1. Add payment information
  2. Create a new API key AFTER adding the payment method
  3. Replace the old key with the new one in the add-in settings

Second Account with Same Phone Number

Created a second OpenAI account with the same phone number

  • Use the first account or create a new one with a different phone number
  • Free credits (if available) are only granted to the first account linked to a phone number

Rate Limit Exceeded

Too many requests per minute

  • Implement exponential backoff between requests
  • Check your current tier in rate limits settings
  • Optimize requests: reduce max_tokens, batch requests where possible
Check Organization and Project
  1. In the API Keys section, check the selected organization
  2. Ensure the correct project is selected
  3. Re-save settings after selecting the organization

Did you create your second account?

You’re getting error 429   because you created a second OpenAI account with the same phone number.

It’s confirmed that free credit is given based on phone numbers, as explained on the official OpenAI forum by @logankilpatrick:

Also note, you only get free credits for the first account associated with your phone number. Subsequent accounts are not granted free credits.

Other

Cancel paid account and renew it with a different payment method

In API Keys under Default Organizations, click the dropdown and click my organization and re-saved it. Make sure to confirm it

Just doing that also reset the soft limit. Afterwards, create a new API key

OpenAI Tier System

OpenAI uses a tier system to determine limits:

  • Free Tier: Minimal limits, requires adding a payment method
  • Tier 1: After first payment ($5+)
  • Tier 2: After $50 usage
  • Tier 3: After $100 usage and 7+ days since first payment
  • Tier 4: After $250 usage and 14+ days
  • Tier 5: After $1000 usage and 30+ days

Each tier provides higher RPM (requests per minute) and TPM (tokens per minute) limits.

Free Tokens Program (Until April 30, 2025)

OpenAI offers organizations a free tokens program:

  • Up to 11 million tokens per day free
  • Requires consent to share request data for model improvement
  • Available only for organizations, not individual developers
  • Program extended until April 30, 2025

Did this answer your question? Thanks for the feedback There was a problem submitting your feedback. Please try again later.

Still need help? Contact Us Contact Us