Provider: Google Gemini

Use Respan Gateway to call Google Gemini models (gemini-3.5-flash, gemini-3-pro, gemini-2.5-flash, and the rest) while keeping unified observability (logs, cost, latency, reliability) in Respan.

Quick setup

Send your first request

Pick the integration that matches your stack. The base URL is https://api.respan.ai/api and the only key needed is your RESPAN_API_KEY.

1
from google import genai
2
from google.genai import types
3
4
client = genai.Client(
5
    api_key="YOUR_RESPAN_API_KEY",
6
    http_options=types.HttpOptions(base_url="https://api.respan.ai/api/gemini"),
7
)
8
9
response = client.models.generate_content(
10
    model="gemini-3.5-flash",
11
    contents="Hello, Gemini!",
12
)
13
print(response.text)

More integrations

Google Gemini models work with every Respan gateway integration:

• Google GenAI
• OpenAI SDK
• LangChain
• LangGraph
• LlamaIndex
• Pydantic AI
• Respan native (OTel)

Switch models

Change the model parameter to call any supported model through the same client. Use the gemini/ prefix to disambiguate when routing across providers. Browse the full list on the Models page.

1
client.chat.completions.create(model="gemini/gemini-3.5-flash", messages=messages)
2
client.chat.completions.create(model="gemini/gemini-3-pro", messages=messages)
3
client.chat.completions.create(model="gemini/gemini-2.5-flash", messages=messages)
4
client.chat.completions.create(model="openai/gpt-5.5", messages=messages)
5
client.chat.completions.create(model="anthropic/claude-sonnet-4-5-20250929", messages=messages)

Use your own Google Gemini key (BYOK)

Credits are the default path. If you’d rather bill Google directly, attach your own provider key.

Override credentials per model (Optional)

Use credential_override when one model on a request should use a different Gemini key than the default.

1
{
2
  "customer_credentials": {
3
    "gemini": { "api_key": "YOUR_GEMINI_API_KEY" }
4
  },
5
  "credential_override": {
6
    "gemini-3.5-flash": { "api_key": "ANOTHER_GEMINI_API_KEY" }
7
  }
8
}

Log without proxying (Optional)

Already calling Gemini directly? Send logs to Respan asynchronously to track cost, latency, and performance for those external calls.

1
import requests
2
3
requests.post(
4
    "https://api.respan.ai/api/request-logs/create/",
5
    headers={
6
        "Authorization": "Bearer YOUR_RESPAN_API_KEY",
7
        "Content-Type": "application/json",
8
    },
9
    json={
10
        "model": "gemini-3.5-flash",
11
        "prompt_messages": [{"role": "user", "content": "Hello, how are you?"}],
12
        "completion_message": {"role": "assistant", "content": "Hello from Gemini through Respan."},
13
        "cost": 0.001,
14
        "generation_time": 1.2,
15
        "customer_params": {"customer_identifier": "user_123"},
16
    },
17
)

See the logging guide for the full setup.