Issue: google/gemini-3-pro Returns "Invalid parameters" Error in Production

[sunglow666]

Problem:

The google/gemini-3-pro model consistently returns an error in production when calling /v1/responses:

Internal error: Completion error: Invalid parameters: Invalid request parameters. Please check your input and try again.

Steps to Reproduce:

1. Call /v1/responses with model google/gemini-3-pro
2. Send any simple input (e.g., "hi")
3. Receive response.failed event with the above error

Current Behavior:

• Model fails immediately with "Invalid parameters" error
• Error occurs even with minimal, valid input
• No actual response generated

Expected Behavior:

Model should process the request and return a valid response.

Impact:

google/gemini-3-pro is completely unusable in production — all requests fail.

[think-in-universe]

Problem

Gemini returns 429 error code.

message | Client error during chat completion stream
model | google/gemini-3-pro
status_code | 429

There're two possible causes:

1. Gemini is rated limited
2. Now we're passing the metadata request parameter in Responses API. The metadata is passed to the chat completions request sent to Gemini, but Gemini doesn't support this parameter.

Investigation

I have tested with NEAR AI Cloud's Gemini 3 Pro on another chat app and with direct API call, which don't use the metadata parameter in chat completions API, but it still fails.

It's likely ether the Gemini account is rate limited, or there's another specific bug for Gemini.

Chat with Cherry Studio

Invalid request parameters. Please check your input and try again.

Direct API call

curl 'https://cloud-api.near.ai/v1/chat/completions' \
  -H 'authorization: Bearer <api-key>' \
  -H 'content-type: application/json' \
  --data '{
  "model":"google/gemini-3-pro",
  "messages":[{"role":"user","content":"Who are you?"}],
  "stream": true
}'

{"error":{"message":"Invalid request parameters. Please check your input and try again.","type":"invalid_request_error","param":null,"code":null}}