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Model guide · updated 2026

Best free AI models

These are the strongest models available on just4o.chat's free Explorer plan, ranked by intelligence. No credit card, no single-vendor lock-in — try several providers in one chat and only upgrade when you actually need the premium tier.

  1. 1

    DeepSeek v3.1

    DeepSeekTop pick

    Software engineering

    AA 60
    Intelligence
  2. 2

    Qwen 3.6 Plus

    Alibaba

    Agentic coding and repository-level problem solving

    AA 50
    Intelligence
  3. 3

    MiniMax M2.7

    MiniMax

    Agentic coding workflows and multi-turn tool-calling chains where the model drives autonomous

    AA 50
    Intelligence
  4. 4

    DeepSeek V4 Flash

    DeepSeek

    High-volume coding assistants and IDE integrations where LiveCodeBench 91.6% and SWE-bench 79% performance matters at low per-token cost

    AA 47
    Intelligence
  5. 5

    Gemini 3 Flash Preview

    Google

    Code generation and software engineering

    AA 46
    Intelligence
  6. 6

    GPT-5.4 nano

    OpenAI

    Data extraction and document parsing at scale

    AA 44
    Intelligence
  7. 7

    MiniMax M2.5

    MiniMax

    High-volume software engineering and code generation across Web

    AA 42
    Intelligence
  8. 8

    GPT-5 mini

    OpenAI

    High-volume API workloads: customer support

    AA 41
    Intelligence

Models available on the free Explorer plan (no premium tier required), ranked by the Artificial Analysis intelligence index.

Compare the top picks →All models

Frequently asked questions

On just4o.chat, the base-tier models above are usable on the free Explorer plan with no payment. Premium and Premium+ models require a paid plan.

Free usage comes with sensible limits (messages per chat, daily caps) rather than hidden quality downgrades — we never silently swap you to a weaker model. When you outgrow the free limits you can upgrade.

No. You can sign up and start using the free models without entering payment details.