api key not valid. please pass a valid api key.

Gemini API · GET /v1beta/models · HTTP 400 INVALID_ARGUMENT

Status: ✅ verified:server:prod · first seen 2026-10-24 · last confirmed 2026-10-27 · 34 confirmations from 2 vantages

An API key that does not exist returns HTTP 400 INVALID_ARGUMENT, not 401 or 403; error.details[0].reason is API_KEY_INVALID.

What to do

1. Send header x-goog-api-key = the account setting api_key.

Dimensions

env: prod · plan: any · region: any · account_state: any

Evidence

Probe af:google-gemini:probe:models-invalid-key (declarative, source)

Observations: none from reporters yet.

Machine access

curl -s https://apifacts.dev/v0/check \
  -H 'content-type: application/json' \
  -d '{"target":{"method":"GET","url":"https://generativelanguage.googleapis.com/v1beta/models"},"error":{"status":400,"body_excerpt":"api key not valid. please pass a valid api key."}}'

YAML: facts/google-gemini/invalid-api-key-400.yaml

Data: CC BY 4.0 · apifacts registry · This page is generated; edit the YAML, not the page.