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
MiniMax M3
MiniMaxTop pickFree on the Explorer plan and genuinely useful for everyday work.
AA 44Intelligence - 2
DeepSeek V4 Flash
DeepSeekHigh-volume coding assistants and IDE integrations where LiveCodeBench 91.6% and SWE-bench 79% performance matters at low per-token cost
AA 40Intelligence - 3
Qwen 3.6 Plus
AlibabaAgentic coding and repository-level problem solving
AA 40Intelligence - 4
Qwen 3.7 Plus
AlibabaFree on the Explorer plan and genuinely useful for everyday work.
AA 39Intelligence - 5
GPT-5.4 nano
OpenAIData extraction and document parsing at scale
AA 38Intelligence - 6
MiniMax M2.7
MiniMaxAgentic coding workflows and multi-turn tool-calling chains where the model drives autonomous
AA 38Intelligence - 7
Nemotron 3 Ultra
NVIDIAFree on the Explorer plan and genuinely useful for everyday work.
AA 38Intelligence - 8
MiniMax M2.5
MiniMaxHigh-volume software engineering and code generation across Web
AA 34Intelligence
Models available on the free Explorer plan (no premium tier required), ranked by the Artificial Analysis intelligence index.
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.