Gemini 4 Argon API: Model ID, Pricing and How to Connect

Short answer

Gemini 4 Argon is available on Moyi API as gemini-4-argon, with a 1,000,000-token context window. Google's introductory list price is $2 per million input tokens and $10 per million output tokens through November 30, 2026, and $4 / $20 from December 1; on Moyi API it is about $0.58 / $2.90 as of the publish date. It uses the same key and base URL as every other model, in both the OpenAI-compatible and the Gemini-native format.

Model ID, list price and curl examples: Gemini 4 Argon API.

What Gemini 4 Argon is

Gemini 4 Argon is Google's flagship model and the first in the Gemini 4 family, announced on September 30, 2026. Google describes it as built for long, multi-step work: software engineering, legal and financial knowledge work, and cyber defense.

What matters for API use:

• Output limit of up to 1,000,000 tokens. The previous limit was 64,000.
• Pricing in two steps, introductory and regular (table below).

Pricing

Per 1 million tokens, in USD:

The introductory price runs through November 30, 2026; the "after the introductory period" column applies from December 1. The live Moyi API number is always on the pricing page; it moves with the upstream price list, so the Moyi API figures here are as of the publish date (introductory period).

For comparison, list prices of other models on Moyi API:

Argon launches at the Sonnet 5.5 price and moves to the Opus 5.5 price afterwards. For Opus 5.5 itself, see Claude Opus 5.5 API pricing and Claude Code setup.

Calling Gemini 4 Argon

OpenAI-compatible format:

curl https://api.moyi-api.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "gemini-4-argon",
    "messages": [{"role": "user", "content": "Explain a context window in one sentence"}]
  }'

from openai import OpenAI

client = OpenAI(base_url="https://api.moyi-api.com/v1", api_key="YOUR_KEY")
resp = client.chat.completions.create(
    model="gemini-4-argon",
    messages=[{"role": "user", "content": "Find the bug in this function and propose a fix: ..."}],
)
print(resp.choices[0].message.content)

Gemini-native format:

curl https://api.moyi-api.com/v1beta/models/gemini-4-argon:generateContent \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "content-type: application/json" \
  -d '{
    "contents": [
      {"role": "user", "parts": [{"text": "Explain a context window in one sentence"}]}
    ]
  }'

Environment variables for Gemini SDKs and Gemini CLI:

export GOOGLE_GEMINI_BASE_URL="https://api.moyi-api.com"
export GEMINI_API_KEY="YOUR_KEY"
export GEMINI_API_KEY_AUTH_MECHANISM="bearer"

Step-by-step install: Gemini CLI with Moyi API. Full request reference: API integration.

Paying for usage

You top up a balance in the console and are charged only for tokens actually used — no subscription.

• Card — Visa, Mastercard and other major cards via Stripe.

FAQ

What is the model ID for Gemini 4 Argon? gemini-4-argon. It is the same in the OpenAI-compatible and the Gemini-native format.

Are Gemini 4 and Gemini 4 Argon the same thing? Argon is the name of the first model in the Gemini 4 family. In the API it is called gemini-4-argon.

Do I need to apply for access? No — a Moyi API API key is enough.

Will the price change? Google's introductory price of $2 and $10 per million tokens runs through November 30, 2026; from December 1 the regular price of $4 and $20 applies. Moyi API's price follows Google's price list.

Next steps

• Create an API key and send your first gemini-4-argon request.
• Claude vs Gemini vs Codex.
• Claude Sonnet 5.5: pricing and setup — a model at the same introductory list price.