antigravity/opus-4.5-thinking Cloud code assist API error (400)

I am getting this error trying out my antigravity provider:

Cloud Code Assist API error (400): {
  "error": {
    "code": 400,
    "message": "{"type":"error","error":{"type":"invalid_request_error","message":"messages.83.content.0.thinking.cache_control: Extra inputs are not permitted"},"request_id":"req_vrtx_011CX1ExtqMRVKH2cMjpMDeT"}",
    "status": "INVALID_ARGUMENT"
  }
}



Anyone had anything similar, or a possible fix?
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