# Google explains how to build with Gemini 4 Carbon

> Original title: Gemini 4 Carbon: Developer Guide

- Source: Google for Developers
- Published: 2026-11-10T21:05:32.000Z
- Bad Influence: https://badinfluence.news/items/p3xni3bz9nply3m7qdsbco4y4
- Original: https://x.com/googledevs/status/2120261599500161276

## Summary

Google for Developers publishes a guide on choosing between Gemini 4 Carbon and Gemini 4 Argon and on using Carbon in the Gemini API. The guide says Carbon is available to paid-tier API users and Google AI Ultra subscribers, with pricing at $2 input and $10 output per 1M tokens through November 30, 2026, then $4 and $20 from December 1. It also lists API changes, including thinking_level settings, a unified 1M-token window, and migration steps from older Gemini models.

## Why it matters

The guide compares Gemini 4 Carbon and Argon, lists API parameter changes, and gives migration steps for developers building on the Gemini API.

## Post

https://x.com/i/article/2120215370787409920