Gemini 3.1 Pro Preview
Review Gemini 3.1 Pro Preview model IDs, endpoint, request parameters, and response examples for HopsAPI.
Gemini 3.1 Pro Preview is a chat model in the HopsAPI catalog. This page documents only gateway-verified protocols, endpoints, and model IDs; context length, vision, tools, reasoning, and JSON capabilities depend on the current upstream and live response.
Model information
| Item | Value |
|---|---|
| Protocol | Google generateContent |
| Endpoint | POST /v1/models/{model}:generateContent |
| Availability | Use the current API key's GET /v1/models response |
| Pricing | Use the console pricing page and account coefficient |
Model IDs
| Model ID | Notes |
|---|---|
gemini-3.1-pro-preview | Use this ID when returned by the current API key's model list |
Do not assume that the model is enabled for your account from this page alone. Before calling it,
query GET /v1/models and use the returned model ID, endpoint, and optional
responses_endpoint exactly.
Core request parameters
| Parameter | Required | Description |
|---|---|---|
model | Yes | Use an ID above that is returned by the model list |
contents | Yes | Google contents / parts content |
generationConfig.maxOutputTokens | No | Limits model output length |
generationConfig.temperature | No | Sampling parameter; accepted range depends on the current upstream |
:streamGenerateContent | No | For streaming, replace the URL method suffix with :streamGenerateContent |
Request example
curl "https://hopsapi.com/v1/models/gemini-3.1-pro-preview:generateContent" \
-H "Authorization: Bearer sk-YOUR_KEY" \
-H "content-type: application/json" \
-d '{"contents":[{"role":"user","parts":[{"text":"Introduce this model in one sentence."}]}],
"generationConfig":{"maxOutputTokens":1500}}'This example uses Authorization: Bearer. The same platform key also works as x-goog-api-key or ?key= on /v1/models/{model}:generateContent. Google's /v1beta path is not this endpoint. Use a model ID from GET /v1/models. See Gemini format.
Response example
This example shows the protocol shape only. Text, token counts, and additional fields such as id and model come from the live response.
{
"candidates": [
{
"content": {
"role": "model",
"parts": [{ "text": "This chat model is called through Google generateContent." }]
},
"finishReason": "STOP"
}
],
"usageMetadata": { "promptTokenCount": 8, "candidatesTokenCount": 20, "totalTokenCount": 28 }
}The gateway passes through native protocol responses and streaming events. See Gemini format.