DeepL API
auth_key query parameter removal
Stopped workingSubscribe to DeepL APIShare
Calls to query parameter auth_key on DeepL API stopped working on January 15, 2026.
Calls it hits
query parameter auth_key
What to use instead of these calls
Send the key in the Authorization header instead, formatted as Authorization: DeepL-Auth-Key [yourAuthKey].
In DeepL API's words
Update: The deadline for this deprecation has been extended to January 15th, 2026.
Facts
- API
- DeepL API
api.deepl.com - Kind
- Parameter removal
- Takes effect
- January 15, 2026
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
- Verified
- , against DeepL API's own pages
Questions
When does this change take effect?
Calls to query parameter auth_key on DeepL API stopped working on January 15, 2026.
What happens to calls after January 15, 2026?
They have failed since January 15, 2026.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
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You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.