AI Gateway REST: google/gemini-3.1-flash-lite failing all requests with HTTP 500

[patrickdundas]

All AI Gateway REST /ai/run requests for google/gemini-3.1-flash-lite have been failing with HTTP 500 for over 7 days (Since July 6th).

Reproduction:
Use the provided example CURL on Cloudflare's official model page:

curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "google/gemini-3.1-flash-lite",
  "input": {
    "contents": [
      {
        "parts": [
          {
            "text": "What are the three laws of thermodynamics?"
          }
        ],
        "role": "user"
      }
    ]
  }
}'

HTTP 500 Response:

{
    "errors": [
        {
            "message": "Model execution failed (Error)",
            "code": 2002
        }
    ],
    "success": false,
    "result": {},
    "messages": []
}

Cloudflare support has failed to raise an outage for this issue, or respond to tickets regarding it.