Long context

gemini-3.5-flash API pricing

Google's Gemini series — very long context windows and strong multimodal input.

Model IDgoogle/gemini-3.5-flash

ChatStreamingTool callingVision

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Call summary

Input

$1.50$0.45/ 1M tokens

Cache write $0.45

Output

$9.00$2.70/ 1M tokens

Cache read $0.45

Context Window

1.05M

Max output

66K

API Endpoints

Available Configurations

Production reliability

Privacy-safe aggregates from real Router One model calls, so you can assess stability and response latency before integrating.

Successful response share

98.19%

Success 2xx

98.19%

Rate limit 429

0.00%

Server 5xx

1.81%

TPS

569.65

tokens/s

Avg. time to first token

4.05 s

Avg. latency

5.85 s

Includes production requests ending in 2xx, 429, or 5xx. Average latency uses successful requests; time to first token and TPS require complete observations from successful streams. Public thresholds are 100 requests and 5 independent principals.

Updated Jul 26, 2026, 4:25 PM UTC

gemini-3.5-flash API endpoints

One API key — call this model through any of the endpoints below.

POST/v1/chat/completionsOpenAI-compatible · Works for every model

Docs

gemini-3.5-flash compared with other models

Spec and price matchups against peer models.

Claude Haiku 4.5vsGemini 3.5 Flash

Call gemini-3.5-flash from your code

The same API key works across every endpoint below.

Endpoint

/v1/chat/completions

Model ID

google/gemini-3.5-flash

Routing mode

auto

Request example

bash

curl -X POST \
  https://api.router.one/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "google/gemini-3.5-flash",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'

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