OpenAI API Key Tester

Test any AI or API key in your browser — instantly see if it's valid, and why it isn't. Nothing is stored.

Test your OpenAI API key with the models endpoint

Data verified 2026-07-13

Key format & how to get one

Prefix: sk- Example: sk-proj-abc123...xyz Modern keys start with sk-proj-; classic user keys start with sk-. Both work. 1. Sign in at https://platform.openai.com 2. Open API keys (https://platform.openai.com/api-keys) 3. Click 'Create new secret key' and copy it 4. Keys start with sk- (newer project keys start with sk-proj-)

How to test

  1. Copy your API key from platform.openai.com/api-keys.
  2. Paste it into the tester above and click Test Key.
  3. A green result means the key is valid; a red result shows the exact error and fix.

Common errors

CauseFix
The key is invalid, revoked, or from a different organization.Create a fresh key at platform.openai.com/api-keys and paste the new one.
Your account has no remaining credit or hit its usage cap.Add billing/credit at platform.openai.com/account/billing, then retry.
Too many requests in a short window (rate limit).Wait a few seconds and test again, or raise your rate-limit tier.

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