Compare / Models
Gemini 4 Carbon vs GPT-6 Astra
Price, context window and capabilities side by side, read from the same catalog that meters your calls, not from a press release.
Gemini 4 Carbon is 5.0x cheaper on input. Gemini 4 Carbon is 5.0x cheaper on output.
At a glance
Side by side
Google DeepMind's strongest model, built for long-horizon engineering and cybersecurity defense, #1 on the Artificial Analysis Intelligence Index v5.0. Coming to the API at Argon's introductory price.
Specifications
Every difference we can measure
| Gemini 4 Carbon | GPT-6 Astra | |
|---|---|---|
| Input price | $2/M | $10/M |
| Output price | $10/M | $50/M |
| Vision | Yes | Yes |
| Tool calling | Yes | Yes |
A row appears only when we hold the fact for both models. Anything the provider has not published is left out rather than guessed, so an empty row is missing data and never a zero.
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FAQ
Frequently asked questions
What is the difference between Gemini 4 Carbon and GPT-6 Astra?
Gemini 4 Carbon is 5.0x cheaper on input. Gemini 4 Carbon is 5.0x cheaper on output. Both run on the same endpoint and the same key here, so trying each is a one-line change to the model id.
Which is cheaper, Gemini 4 Carbon or GPT-6 Astra?
Gemini 4 Carbon is, on input tokens. Output usually dominates the bill on generative work, so check the output row above against your own ratio of prompt to completion before deciding.
Can I switch between Gemini 4 Carbon and GPT-6 Astra without changing my code?
Yes. Both are OpenAI-compatible through one CompanyFabric key, so switching is the model string and nothing else, no second SDK, no second contract, one prepaid balance across both.
Do I have to choose?
No. Send companyfabric/auto and we route each request to the cheapest model that can serve it, which is how most people use both without deciding in advance.
One key. Every model. Exact prices.
Run Gemini 4 Carbon and GPT-6 Astra on the same key and compare them on your own prompts. Free starter credits included, no subscription required.