Google: Gemini 4 Argon · fastrouter

Gemini 4 Argon is Google's flagship reasoning model, built for complex software engineering, deep math and science problem solving, autonomous multi-step agents, enterprise knowledge work such as legal and finance, and defensive cybersecurity. It accepts text, images, video, audio, and PDFs and returns text, with a unified 1,048,576-token input and output window, tunable thinking levels (low, medium, high), and long decode that lets a single response run past 64K tokens, up to 1M, using background execution. It supports tool calling, structured outputs, code execution, computer use (preview), file search, Google Search and Maps grounding, and implicit context caching. It is not available on the Gemini API free tier.

Base model All models on this base All models of the provider to the provider

Input, $/1M $2.00

Output, $/1M $10.00

Cache read $0.10

Cache write —

Context 1 048 576

Max output 65 536

Accepts audio, files, images, text, video

Last checked 04.11.2026 12:00:14 UTC

Source provider's page

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API

OpenAI-compatible API: the official OpenAI SDKs work with this base URL. Replace YOUR_API_KEY with your key from the provider.

API base URL	`https://go.fastrouter.ai/api/v1`
Endpoint	`https://go.fastrouter.ai/api/v1/chat/completions`
Model id	`google/gemini-4-argon`

curl

curl https://go.fastrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "google/gemini-4-argon", "messages": [{"role": "user", "content": "Hello!"}], "max_tokens": 256}'

Python

import requests

r = requests.post(
    "https://go.fastrouter.ai/api/v1/chat/completions",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={
      "model": "google/gemini-4-argon",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ],
      "max_tokens": 256
    },
)
print(r.json())

JavaScript

const r = await fetch("https://go.fastrouter.ai/api/v1/chat/completions", {
  method: "POST",
  headers: {Authorization: "Bearer YOUR_API_KEY", "Content-Type": "application/json"},
  body: JSON.stringify({
    "model": "google/gemini-4-argon",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ],
    "max_tokens": 256
  }),
});
console.log(await r.json());

Request (JSON)

{
  "model": "google/gemini-4-argon",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ],
  "max_tokens": 256
}

Response (JSON)

{
  "id": "chatcmpl-...",
  "object": "chat.completion",
  "model": "google/gemini-4-argon",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hi! How can I help?"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 9,
    "completion_tokens": 12,
    "total_tokens": 21
  }
}

The address is taken from the provider's model list; check it against the provider's documentation.

Provider's API documentation

Source: AI Rate Card, https://airatecard.com/en/c/offer%3Afastrouter%7Cgoogle/gemini-4-argon, prices checked 2026-11-04; seller's page: https://fastrouter.ai

Technical details

ID: offer:fastrouter|google/gemini-4-argon