Gemini 4
Carbon Chat

Available now. No Google account or API key needed.

Chat with Gemini 4 Carbon in your browser for reasoning, writing and code review. Register with email or Google, then buy credits to send messages. No subscription; chat, web search and Nano Banana images share one balance.

Chat with Carbon Availability and service status

Short-exchange example: about 25 credits ($0.03 or €0.03). Actual usage varies.

Gemini 4 Carbon

Available

Your next good idea

Starts with a question.

Carbon available · Credits charged for each reply’s actual usage

Write your prompt first. Sign in and use credits when you send.

Streaming responsesSaved conversationsUsage-based credits

Before you start: account, API key and credits

Do I need my own API key?

No. TryCarbon AI connects the model for you. Create an account with email and password or use Google sign-in, then add credits. A Google account, Google subscription and your own API key are not required.

Can I try the chat without buying credits?

You can browse every guide and prompt template for free. Sending a message needs credits. Packs start at $10 or €10 for 10,000 credits, with no subscription and no expiry.

Know what you spend.

View the credits charged for each reply. Chat, images and web search share one balance, with no subscription or expiry.

Explore credit packs

What can your credits do?

Short Carbon or Argon exchange: About 25 creditsApprox. $0.03
One web search query: About 50 creditsApprox. $0.05
Nano Banana 2 Lite · 1K: From 120 creditsApprox. $0.12+

Chat varies with usage. Search adds to chat charges; image prices start at the amount shown. Check usage history for your final charge.

How Gemini 4 Carbon chat works here

Draft a clear explanation, work through a problem, or refine a piece of code. Keep the context and come back when you need it.

Chat with Carbon

Your conversations, ready when you are

A conversation that stays with you

Saved history belongs to your account. Open an earlier conversation and pick up where you left off.

Copy responsesExport Markdown

Guides for Carbon and Argon chat

Guides

Compare benchmarks, speed and credits

Compare published benchmarks, response speed and credit usage.

How to start your first Argon chat

Try the Argon coding test: 3 prompts, 18 checks

Argon vs. Carbon: what you can use here

Choose around the task you can complete today. This table compares availability in TryCarbon AI, not benchmark performance. A model’s advertised capabilities or maximum context do not automatically describe the features available through every service that uses it.

Current web-chat availability
Question	Gemini 4 Argon	Gemini 4 Carbon
Availability here	Available in our chat	Available; default for new chats
Cost here	Credits charged for actual usage	Same credit rates as Argon; usage varies by reply
Workflows here	Text explanations, code discussions and draft revision	Reasoning, code review, writing, search and image tools
Input and context	Start with relevant passages; history also affects usage	Choose 128K, 256K, 512K or 1M input context

Compare Argon and Carbon in more detail

Three useful starting points for Gemini chat

These are prompt templates you can adapt, not captured test outputs or performance promises. Replace the bracketed text with your own material, work on one question at a time, and read the result before deciding on the next step. State the audience, desired format and constraints explicitly so you have a clear basis for judging the answer.

Explain a difficult idea

Explain the following material to a colleague seeing it for the first time. Start with a one-sentence definition, give one concrete example, and list the questions the material leaves unanswered. Use only the information I provide: [paste material].

Tell Gemini what your reader already knows and where the explanation will be used. A specific passage and audience give you a clearer result to check than a request to explain everything about a topic. Follow up with a request for a shorter version, another example or a definition of one unfamiliar term. Compare the response with the original material, especially names, figures, conditions and dates. When the source leaves a gap, ask for an explicit question rather than an invented answer. Keep the conversation if you plan to add more source material later.

Work through a code problem

Read this minimal example and error output. List plausible causes, propose the smallest change, and suggest a test that distinguishes the old behavior from the fix. Do not assume dependency versions I have not supplied: [code and error].

Include what you expected, what actually happened and the steps needed to reproduce the problem. Remove credentials and personal data before sharing an example. Ask Gemini to explain why its change addresses the failure, then inspect the proposed diff before applying it. A generated patch is a suggestion: it does not mean the code ran or that your issue is fixed. Try it in an isolated environment and run the tests relevant to the changed behavior. If it fails, bring the new error or test result back into the same conversation so the next answer has concrete evidence.

Revise a draft with clear constraints

Revise this passage for a busy reader. Preserve names, numbers, quotations and every qualification. Return the edited passage, followed by three notes explaining the main changes. Do not introduce new claims: [draft].

Describe the purpose, audience and tone you want to preserve. You can ask for clearer structure, shorter sentences or a different opening without requesting a wholesale rewrite. Compare the response with your original: a tentative “may” should not become a confident “will,” and an association should not become a causal claim. Keep the edits that serve your reader and reject wording that changes your intent. Once you are satisfied, copy the response or export the conversation as Markdown. Review quotations and private details again before sending the result to someone else.

Gemini chat: accounts, credits and conversation history

At the illustrative short-exchange amount shown above, four similar exchanges would use about 100 credits. That is a planning example, not a measured average or a fixed per-message tariff. Longer replies, searches, image generation or more conversation history change the actual usage. Use your recorded charges to assess your own workflow rather than treating the example as a guaranteed number of conversations.

Can I use Gemini 4 Carbon here?

Yes. Gemini 4 Carbon chat is available here and is the default for new conversations. Use the model menu to switch to Argon. Sign in and add credits; chat, web search and Nano Banana images share one balance. Each saved reply shows the model used. Check Carbon availability here

How do credits work, and is each message the same price?

Chat is charged for actual usage rather than a fixed fee per message. Longer inputs, replies and conversation history can use more credits. Chat, image generation and web search share one balance, and search adds its own usage when used with chat. The examples on this page are planning aids, not a promise that every request costs the same amount. Check your balance before a long task and your usage history afterward for the actual charge. The pricing page lists available packs; our token guide explains why equal numbers of messages can have different costs. Understand tokens and credits

Can I save and continue a conversation?

Signed-in conversations can be continued from history. You can also copy a reply or export a conversation as Markdown. Continue in the same conversation when you want to preserve the material and constraints for one task; start a new conversation for an unrelated topic. Longer history can also affect subsequent usage, so consider both continuity and cost. An export records the conversation, not proof that a statement is correct or that generated code has passed a test. Review important claims and remove personal or project information before sharing it. Save and continue your chat

How is this different from Google’s Gemini app?

TryCarbon AI is an independent web service with its own account, credit balance, conversation history and support. It is not Google’s Gemini app. Do not assume that an official subscription, included allowance, app integration or account data transfers to this service. A shared model name does not mean that two products offer the same tools, interface or usage limits. If you need a feature specific to a Google application, check that product’s official documentation. If you want our credit-based web chat workflow, read the getting-started and pricing information before purchasing. About TryCarbon AI

Gemini 4 Carbon Chat