# Gemini 4 Carbon vs Gemini 4 Argon

> Markdown mirror of https://router.one/models/compare/gemini-4-carbon-vs-gemini-4-argon for AI assistants and crawlers. Router One is a unified, OpenAI-compatible LLM API gateway.

Gemini 4 Carbon and Gemini 4 Argon come to the same total on Router One for a 1M-input + 1M-output mix ($5.04), so price does not decide this pair. Both carry a 1.05M context window. Both answer on /v1/chat/completions.

Gemini 4 Carbon and Gemini 4 Argon compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint that logs each request it forwards.

## Gemini 4 Carbon vs Gemini 4 Argon: rates, context window, and capabilities

| Spec | Gemini 4 Carbon | Gemini 4 Argon |
| --- | --- | --- |
| Input / 1M tokens | $0.84 | $0.84 |
| Output / 1M tokens | $4.20 | $4.20 |
| Cached input / 1M tokens | $0.84 | $0.84 |
| Context window | 1.05M | 1.05M |
| Capabilities | Chat, Streaming, Tool calling, Vision | Chat, Streaming, Tool calling, Vision |
| Subscription plans | Premium models — Pro, Max, Ultra | Premium models — Pro, Max, Ultra |
| Detail page | [Gemini 4 Carbon](https://router.one/models/gemini-4-carbon) | [Gemini 4 Argon](https://router.one/models/gemini-4-argon) |

## What does 1M tokens cost on Gemini 4 Carbon vs Gemini 4 Argon?

For a workload of 1M input plus 1M output tokens at current rates, Gemini 4 Carbon and Gemini 4 Argon both come to $5.04. Price, context window and listed capabilities all match, so A/B them on your own prompts: change one model string and compare latency and the wallet charge or plan quota each request used in your request traces.

## Switch between Gemini 4 Carbon and Gemini 4 Argon

The API key, base URL, endpoint and request shape stay the same — Router One serves both on /v1/chat/completions, so switching is a model-string change. Per Google's What's new pages for Gemini 4 Carbon and Gemini 4 Argon (checked 2026-11-11), on Google's own Gemini API the two models share the same context window, built-in tools, per-token price and thinking levels (low, medium and high, with medium as each model's default), and moving from Gemini 4 Argon to Gemini 4 Carbon needs no request schema changes; the main difference is that Carbon spends more thinking tokens per turn to explore and verify its work, which raises per-turn token use and latency, while Google positions Argon for faster responses and lower token spend per turn. Per Google's Gemini models page (checked 2026-11-11), Google calls Gemini 4 Carbon its strongest reasoning model and Gemini 4 Argon its efficient Gemini 4 frontier reasoning model. On a Pro, Max or Ultra plan the billing differs: as of the 2026-11-11 plan response, Gemini 4 Argon counts against the Premium models allowance; Gemini 4 Carbon, in no plan tier, bills the wallet per token. Run your own prompts on both before you move a workload.

`compare.sh`

```bash
curl https://api.router.one/v1/chat/completions \
  -H "Authorization: Bearer sk-your-router-one-key" \
  -H "Content-Type: application/json" \
  -d '{"model": "google/gemini-4-carbon", "messages": [{"role": "user", "content": "Hello"}]}'

# Same request, other model — change one string:
#   "model": "google/gemini-4-argon"
```

## FAQ

### Is Gemini 4 Carbon cheaper than Gemini 4 Argon?

Input: Gemini 4 Carbon $0.84 vs Gemini 4 Argon $0.84 / 1M tokens; the rates are equal. Output: Gemini 4 Carbon $4.20 vs Gemini 4 Argon $4.20 / 1M tokens; the rates are equal. Total cost depends on the workload's input, output and cache usage. Rates change; the /models page is the live source of truth.

### Is Gemini 4 Carbon or Gemini 4 Argon included in a Router One subscription?

Gemini 4 Carbon and Gemini 4 Argon both count against the Premium models allowance on Pro, Max and Ultra: Pro 300, Max 1,000 and Ultra 5,000 requests per 30-day cycle, one pool shared by every model in that tier. Requests beyond a plan's allowance bill the wallet per token.

### Can I switch between Gemini 4 Carbon and Gemini 4 Argon without changing code?

The API key, base URL, endpoint and request shape stay the same — Router One serves both on /v1/chat/completions, so switching is a model-string change. Per Google's What's new pages for Gemini 4 Carbon and Gemini 4 Argon (checked 2026-11-11), on Google's own Gemini API the two models share the same context window, built-in tools, per-token price and thinking levels (low, medium and high, with medium as each model's default), and moving from Gemini 4 Argon to Gemini 4 Carbon needs no request schema changes; the main difference is that Carbon spends more thinking tokens per turn to explore and verify its work, which raises per-turn token use and latency, while Google positions Argon for faster responses and lower token spend per turn. Per Google's Gemini models page (checked 2026-11-11), Google calls Gemini 4 Carbon its strongest reasoning model and Gemini 4 Argon its efficient Gemini 4 frontier reasoning model. On a Pro, Max or Ultra plan the billing differs: as of the 2026-11-11 plan response, Gemini 4 Argon counts against the Premium models allowance; Gemini 4 Carbon, in no plan tier, bills the wallet per token. Run your own prompts on both before you move a workload.

### Where do these numbers come from?

Specs and prices on this page render from the live Router One catalog — the same data as the /models page — and refresh with it. Pricing methodology is documented on /pricing-methodology. Rates on this page were read from the live catalog on 2026-11-11 (UTC) and refresh within the hour.

## More comparisons

- [Gemini 3.5 Flash Lite vs Gemini 3.5 Flash](https://router.one/models/compare/gemini-3-5-flash-lite-vs-gemini-3-5-flash)
- [Claude Haiku 5.5 vs Gemini 3.5 Flash Lite](https://router.one/models/compare/claude-haiku-5-5-vs-gemini-3-5-flash-lite)
- [Gemini 3.8 Flash vs Gemini 3.7 Flash](https://router.one/models/compare/gemini-3-8-flash-vs-gemini-3-7-flash)
- [Claude Haiku 4.5 vs Gemini 3.5 Flash](https://router.one/models/compare/claude-haiku-4-5-vs-gemini-3-5-flash)

## See also

- Canonical page: https://router.one/models/compare/gemini-4-carbon-vs-gemini-4-argon
- All model comparisons: https://router.one/models/compare
- All models & prices: https://router.one/models (markdown: https://router.one/models.md)
- Pricing: https://router.one/pricing
- Gemini API in China: https://router.one/gemini-api-china
- Gemini 4 Carbon API guide: https://router.one/blog/gemini-4-carbon-api-guide
- Gemini 4 Argon API guide: https://router.one/blog/gemini-4-argon-api-guide
- Cost calculator: https://router.one/llm-cost-calculator
- Pricing methodology: https://router.one/pricing-methodology