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DeepSeek V3.1 Free AI Chatbot

Chat with DeepSeek V3.1, DeepSeek's open model for coding and maths. It answers straight away or thinks hard problems through, and scored 88.4 on AIME 2025. DeepSeek V3.1 is available for free on AIFreeForever.

Create anything with DeepSeek V3.1 using our @skills feature

About DeepSeek V3.1 AI model

DeepSeek V3.1 is DeepSeek's open model that answers straight away or thinks step by step, released on 21 August 2025. DeepSeek trained it to use tools and handle tasks with several steps. Chat with DeepSeek V3.1 free on AIFreeForever.

DeepSeek V3.1Made by DeepSeek Try DeepSeek V3.1 on AIFreeForever→
Made byDeepSeek
Model IDDeepSeek-V3.1
ReleasedAugust 21, 2025
Size671B parameters (37B active)
LicenceMIT
Price of DeepSeek V3.1 on AIFreeForeverFree

AIFreeForever is not affiliated with or endorsed by the model providers. All trademarks and logos belong to their owners.

What DeepSeek V3.1 is best at

Coding

Scores 66.0 on SWE Verified, a test of fixing real code.

Maths

Scores 88.4 on AIME 2025 in thinking mode, a maths contest test.

Knowledge

Scores 84.8 on MMLU-Pro in thinking mode, a broad knowledge test.

Coding

Scores 76.3 on Aider-Polyglot in thinking mode, a test of editing code.

How to use DeepSeek V3.1 for free on AIFreeForever

  1. 1

    Open the chat

    and choose DeepSeek V3.1.

  2. 2

    Type your question

    or paste your code.

  3. 3

    Ask for every step

    on maths and logic questions.

  4. 4

    Read the answer

    and ask follow-up questions.

Tip: Ask DeepSeek V3.1 to check its answer before it finishes, so you get accurate results on code and maths.
Try it for free

Chat with DeepSeek V3.1 on AIFreeForever

AIFreeForever's free chatbot is fully integrated with DeepSeek V3.1 via the official API providers. To get started, type your question or paste a supporting document, and DeepSeek V3.1 answers in the same chat. Use it to fix bugs, solve maths homework, move code to another language and more.

This model is subject to availability, based on our budget. For long-term use, we advise you to pay for an upgrade with the model provider.
Tip: DeepSeek V3.1 is best suited for everyday tasks.

Why choose AIFreeForever's free DeepSeek V3.1?

No upgrade required

Our chatbot gives you DeepSeek V3.1 free, without a DeepSeek account.

Code fixing

It scored 66.0 on SWE Verified, a test of fixing real code.

Maths

It scored 88.4 on AIME 2025 in thinking mode.

Two modes

Our chatbot gives you quick answers or step-by-step thinking from one model.

Tool use

DeepSeek trained it to call tools and handle tasks with several steps.

Open model

MIT licence allows free business use.

What you can create with DeepSeek V3.1

A whale with dolphin fins and a sleek violet back, leaping above a dark seaPlain chat

Bug fixing

The cause, the fix and a test.“Here's my Python function and the error. Find the bug and fix it.” Try the prompt→ A brass slide rule lying across two polished steel set squaresPlain chat

Maths solving

Every step, with a check.“Solve this step by step and check the answer: 3x² + 5x − 2 = 0.” Try the prompt→ A pair of matching keys, one silver and one gold, on a single ringPlain chat

Code translation

The same code in another language.“Rewrite this JavaScript function in Python and keep the same behaviour.” Try the prompt→ A futuristic low electric car with a glass roof and a green light under its doors@Website

Landing pages

A one-page site in HTML.“@Website A landing page for a tutoring business with prices and a contact form.” Try the prompt→ A metal toolbox with neat compartments of screws in violet and green trays@Excel

Spreadsheets

A tracker with formulas.“@Excel A study planner with subjects, hours and a weekly total.” Try the prompt→ A small glass jar half filled with gold coins and a sprout growing from the top@Business

Income ideas

Side jobs that use coding.“@Business 5 side jobs for someone who knows Python.” Try the prompt→

Best DeepSeek V3.1 prompts

Free DeepSeek V3.1 Bug Fix Prompt

“Here's my code and the error message. Find the cause, fix it and explain the fix in 2 lines: [paste]” Try the prompt→

Free DeepSeek V3.1 Code Translation Prompt

“Rewrite this JavaScript in Python. Keep the same behaviour and add type hints.” Try the prompt→

Free DeepSeek V3.1 Code Review Prompt

“Review this function. List any bugs, slow parts and unclear names, then show the improved version.” Try the prompt→
Download the free DeepSeek V3.1 prompt guide (PDF) →

How much does DeepSeek V3.1 cost?

DeepSeek V3.1 costs $0.25 per million input tokens and $0.95 per million output tokens on OpenRouter. It's free on AIFreeForever and free to download under the MIT licence.

WherePriceCached inputContext
OpenRouter$0.25 in / $0.95 out per 1M tokens—164K
Hugging Face weightsFree (MIT)—128K
AIFreeForever's Free AIFree——

Can you use DeepSeek V3.1 for free?

Yes. You can use DeepSeek V3.1 free in two ways:

  • On AIFreeForever: pick it in the chat and start typing.
  • On your own servers: download it from Hugging Face. At 671B parameters, it needs data-centre GPUs.
Chat with DeepSeek V3.1

DeepSeek V3.1 benchmark results

DeepSeek V3.1 scored 66.0 on SWE Verified, up from 45.4 for DeepSeek V3-0324, and 88.4 on AIME 2025 in thinking mode.

BenchmarkWhat it testsV3.1 (non-thinking)V3.1 (thinking)V3-0324R1-0528
MMLU-ProBroad knowledge83.784.881.285.0
GPQA DiamondGraduate-level science74.980.168.481.0
LiveCodeBenchCoding problems56.474.843.073.3
Aider-PolyglotEditing code68.476.355.171.6
SWE VerifiedFixing real code66.0—45.444.6
Terminal-benchCoding in a terminal31.3—13.35.7
AIME 2025Contest maths49.888.451.387.5

This benchmark was extracted from DeepSeek.

DeepSeek R1-0528 scored slightly higher than V3.1 in thinking mode on two tests in the same table. On MMLU-Pro, R1-0528 got 85.0 and V3.1 got 84.8. On GPQA Diamond, R1-0528 got 81.0 and V3.1 got 80.1.

DeepSeek V3.1 vs other top models

DeepSeek V3.1 is the open model below with MIT-licensed weights and both thinking and non-thinking modes.

ModelContextImage inputStrength
DeepSeek V3.1128KNoCoding at low cost
DeepSeek V3128KNoMaths and Chinese
MiniMax M2.7197KNoCoding and office files
GLM 5.31MNoCoding and cybersecurity

Pick DeepSeek V3.1 for code fixes and maths. Pick GLM 5.3 for very long code.

How DeepSeek V3.1 works

DeepSeek V3.1 is one hybrid model with two modes: it answers straight away in non-thinking mode, or reasons first in thinking mode. It's a mixture-of-experts model, so 37B of its 671B parameters run for each token, as explained in DeepSeek's V3.1 announcement.

Limitations of DeepSeek V3.1 on AIFreeForever

DeepSeek V3.1 has four limits on AIFreeForever, which connects to it through its API and adds our skills and file editors:

  • DeepSeek V3.1 reads text only, not images.
  • DeepSeek's own app and its search agent aren't part of AIFreeForever.
  • DeepSeek's own API now serves newer V4 models, not V3.1.
  • You can't run Python, start agents that work on their own, or run regression analysis here.
Tip: Test DeepSeek V3.1 free here first. For the best experience, use DeepSeek's own platform and its newest models.

Best ways to test DeepSeek V3.1 free

TestHow to use it on AIFreeForever
Bug fixingPaste broken code; run its fix yourself.
MathsAsk a contest question; check each step.
Code translationConvert a short function; run both versions.
Compare modelsRun the same task on DeepSeek V3.

These limitations only cover what you can do with DeepSeek V3.1 on AIFreeForever, not the limits of the model on DeepSeek’s own platform. All trademarks belong to their owners, and the model’s full features are only available when you use it officially through DeepSeek.

Answers to questions about DeepSeek V3.1

Is DeepSeek V3.1 free?

Yes. It's free on AIFreeForever and free to download under the MIT licence.

Who made DeepSeek V3.1?

DeepSeek made DeepSeek V3.1.

When was DeepSeek V3.1 released?

DeepSeek released V3.1 on 21 August 2025.

Does DeepSeek V3.1 have a thinking mode?

Yes. One model has a thinking mode and a non-thinking mode.

Can DeepSeek V3.1 read images?

No. DeepSeek V3.1 reads and writes text only.

How large is the DeepSeek V3.1 context window?

DeepSeek V3.1 takes up to 128K tokens in both modes.

What's the difference between DeepSeek V3.1 and DeepSeek V3?

V3.1 adds a thinking mode and better tool use. On SWE Verified, V3.1 got 66.0 and V3-0324 got 45.4.

Are DeepSeek V3.1 answers 100% correct?

No. It can make mistakes, so test its code and check important facts.

Get answers from DeepSeek V3.1 for free

Ask DeepSeek V3.1 a question, paste your code or add a file and get instant answers. Not satisfied? Compare your answers to other models for free.

Chat with DeepSeek V3.1

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