Get DeepSeek V4 Flash for FREE with cnb.cool: Complete CodeBuddy Guide for Beginners (2026)

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"DeepSeek V4 Flash... is there any way to use it for free?"

Good news: In August 2026, a rumor spread across X (Twitter) that cnb.cool, a development platform by Tencent Cloud, lets you use DeepSeek V4 Flash for free until December 31, 2026.

Here is the post that started it:

UNLIMITED DEEPSEEK V4 FLASH FOR FREE UNTIL DECEMBER 31, 2026

1. Go to cnb.cool
2. Open any repository
3. Type @codebuddy inside the repo
4. Enable "Work for me" mode
5. Give it a task and let it run No card. No subscription. Free until the end of 2026. (Source: @RoundtableSpace / 0xMarioNawfal)

This article explains, for beginners:

• What is cnb.cool?
• What is CodeBuddy?
• How to use DeepSeek V4 Flash for free (illustrated steps)
• Facts I actually verified (fact-check results)
• Comparison with other free options

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🎯 Quick Verdict: It's a Great Deal — But Always Verify on the Official Page

If you create a free account on cnb.cool, you can very likely use DeepSeek V4 Flash (a high-performance AI) for free until December 31, 2026.

But let me be honest with you:

• ✅ What I confirmed: cnb.cool's official page shows "CodeBuddy（临时免费，年底再说）" = "Temporarily free until year-end"
• ✅ What I confirmed: cnb.cool's default AI model is set to deepseek-v4-flash
• ⚠️ Not confirmed: No official statement saying "all users are guaranteed free until December 31" was found on public pages
• ⚠️ Not confirmed: Whether the "替我上班 (Work for me)" mode works for every account depends on the page you see after login

In other words: it's definitely worth trying for free — but before migrating any important project, verify the conditions on your own account.

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🤔 What is cnb.cool (CNB)?

cnb.cool is a developer platform operated by Tencent Cloud in China.

Its tagline is "Everything as Code".

It lets you manage code repositories, builds (automated execution), and development environments all in the cloud — similar to GitHub or GitLab.

What can you do with it?

• 📁 Code repositories: Store and manage projects
• 🏗️ Cloud Native Build: Build Docker-based environments declaratively
• ☁️ Cloud development environments: Edit and run code in the browser
• 🤖 CodeBuddy (AI coding agent): An AI that writes and executes code for you

The last one — CodeBuddy — is what matters for this article.

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🤖 What is CodeBuddy?

CodeBuddy is an AI coding agent provided by Tencent Cloud.

An "agent" is not just a chatbot that replies — it's an AI that reads, writes, and executes code on your behalf.

CodeBuddy's features:

• 🔧 Three forms: IDE (editor), CLI (command line), and in-browser agent
• 🧠 Multi-model support: Tencent's Hunyuan model plus DeepSeek and others
• 🚀 Full-flow support: From requirements → design → coding → deployment, all assisted by AI
• 🌐 Integrated with cnb.cool: Type @codebuddy inside a repository to invoke it

In short, it's like "asking an AI to do work on GitHub" — that's the cnb.cool × CodeBuddy combo.

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💰 Why is DeepSeek V4 Flash Free Here?

On July 31, 2026, DeepSeek released the official version of DeepSeek V4 Flash (0731).

• Agent performance massively improved (Cybergym +98%, DeepSWE +645%)
• Pricing is extremely cheap (huge cost reduction vs V4 Pro)
• Official API is in public beta

Riding this wave, cnb.cool is temporarily opening DeepSeek V4 Flash for free as a marketing move to get people to try CodeBuddy. The official page says "临时免费，年底再说" (temporarily free, we'll see at year-end).

"Let users try a new feature for free to grow the user base" — a common promotion tactic for Chinese cloud services.

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🛠️ How to Use It (5 Illustrated Steps)

Here's the procedure from the X post, explained in detail for beginners.

Step 1: Go to cnb.cool

Open cnb.cool. The interface is available in English and Chinese (English is fine for your first visit).

Step 2: Open any repository

A repository is where projects live.

• Create your own repository (free)
• Or open a public sample repository

Step 3: Type @codebuddy inside the repository

Type @codebuddy in the chat field to invoke the CodeBuddy agent.

Step 4: Enable "替我上班" (Work for me) mode

In Chinese it's 「替我上班」 (= "work on my behalf"), in English "Work for me". Turn it ON.

With this mode ON, the AI can:

• Read the code in your repository
• Create and modify files
• Run commands and check results
• Fix errors and re-run

...meaning it works autonomously.

Step 5: Give it a task and let it run

Any language works — Japanese, English, or Chinese. For example:

• "Implement a login feature"
• "Write a README in English"
• "Fix the bug and make the tests pass"

Once the AI starts, all you do is watch the results.

Illustrated Flow: How CodeBuddy Works

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✅ What I Actually Verified (Fact-Check Results)

Here's what I could directly confirm as of August 2026.

Verified Facts

Points to Watch

1. "Temporarily free" can change anytime: Promotions may end or change without notice
2. What you see after login is the truth: Always verify free quota, usage limits, and model selection after creating your account
3. "Free" ≠ "Unlimited": Long contexts, heavy tasks, and extra tools may have limits
4. Security first: Try it with a test repository. Before giving AI access to production repos, verify keys and secrets handling

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🔄 Comparison with Other Free Ways to Use DeepSeek V4 Flash

Besides cnb.cool, there are other free or cheap ways to use DeepSeek V4 Flash.

Bottom line: Use cnb.cool if you want a free coding agent; use the official API for production.

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🤔 FAQ

❓ Can I use it in Japanese?

Yes — you can give instructions in Japanese. The UI is primarily English/Chinese, but task descriptions can be in any natural language.

❓ Is it safe even though it's a Chinese service?

Tencent Cloud is one of China's largest cloud providers. Using the free tier is generally fine, but I recommend not uploading sensitive information and testing in a test repository.

❓ Do I really not need a credit card?

The X post says "No card. No subscription." In reality, you need to register a free account. Verify whether a card is required on the registration screen.

❓ I can't find "替我上班" / "Work for me"?

It's labeled "替我上班" in Chinese and "Work for me" in English. The entry point may differ depending on your account type or page version. If you can't find it, try typing @codebuddy in the repository chat field.

❓ What happens after December 31?

Based on the "年底再说" (we'll decide at year-end) wording, the campaign will likely become paid or change conditions afterward. Use the free period to evaluate, and prepare to migrate to the official API if needed.

❓ How is this different from the existing DeepSeek V4 Flash article?

The official API guide covers "how to integrate the API into your own tools," while this article focuses on "how to use it for free as a coding agent on cnb.cool." Different purposes — reading both is recommended.

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🔮 Summary: Worth Trying During the Free Period

cnb.cool × CodeBuddy = a chance to experience DeepSeek V4 Flash as a coding agent for free.

• Free account creation
• Just type @codebuddy inside a repository
• Run autonomously with "替我上班 / Work for me" mode
• Temporarily free until December 31, 2026 (official page wording)

However, always verify the "free" conditions on the page after login. Promotions can change without notice.

Start with a small test repository and experience what an AI coding agent can really do.

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📖 Related Articles

• DeepSeek V4 Flash Official API Goes Public Beta (July 31, 2026): Full Guide — Complete guide to the official API