Gemini 3.8 Flash API: OneInfer and Google Endpoints

OneInfer cURL quickstart

curl https://api.oneinfer.ai/v1/ula/chat/completions \
  -H "Authorization: Bearer $JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/gemini-3.8-flash",
    "messages": [{"role": "user", "content": "Summarise the attached research in five bullets."}],
    "max_tokens": 2048,
    "stream": false
  }'

OneInfer Python quickstart

from openai import OpenAI

client = OpenAI(
    base_url="https://api.oneinfer.ai/v1/ula",
    api_key="$JWT_TOKEN",
)

response = client.chat.completions.create(
    model="google/gemini-3.8-flash",
    messages=[
        {"role": "user", "content": "Summarise the attached research in five bullets."},
    ],
    max_tokens=2048,
)
print(response.choices[0].message.content)

Verified API facts

OneInfer availability

Gemini 3.8 Flash is live on OneInfer via OpenRouter under google/gemini-3.8-flash. Point the OpenAI-compatible base URL at https://api.oneinfer.ai/v1/ula and pass your OneInfer API key in the Authorization header. The request body is unchanged from any other chat-completions call; only the base URL and the model string differ.

Day-zero third-party support

LiteLLM (docs.litellm.ai/blog/gemini_3_8_flash), Vercel AI Gateway, OpenRouter, AIHubMix and LLM Gateway all published Gemini 3.8 Flash support on 2 September 2026. LiteLLM and Vercel both hold first-page Google positions with their changelog posts. OneInfer's route is the OpenRouter path; if you need an OpenAI-compatible endpoint today, that is the working route.