LLM Perks

O3 Mini

Free right now Small New

O3 Mini is a language model. It is currently free at 1 provider with up to 200K tokens of context.

Context
200K tokens
Type
Text
License
Proprietary
Free since
October 11, 2026

Where to use O3 Mini for free

Each row is a separate free endpoint with its own limits.

ProviderContextLimitCard
UnoRouter
o3-mini:free
200K No-card free models use shared capacity and per-model limits; availability can change. No Open

Quick start

curl https://api.unorouter.com/v1/chat/completions \
  -H "Authorization: Bearer $UNOROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "o3-mini:free",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Example for UnoRouter. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.

Benchmarks

Intelligence Index
12.5
GPQA Diamond
74.8%
Humanity's Last Exam
7.9%
Terminal-Bench Hard
6.8%
τ²-Bench
28.7%

Source: Artificial Analysis · o3-mini

FAQ

Is O3 Mini free?

Yes. As of October 11, 2026, O3 Mini is free at UnoRouter. Each provider has its own limits — see the table above.

What is the context window of O3 Mini?

The largest context among free routes is 200,000 tokens. Some providers cap it lower.

How do I call O3 Mini via API?

Use any OpenAI-compatible client with base URL https://api.unorouter.com/v1, model ID o3-mini:free, and a UnoRouter key.

How good is O3 Mini?

Artificial Analysis Intelligence Index: 12.5, GPQA Diamond: 75%. For comparison, the strongest free model in the catalog right now is GLM 5.3.

Is O3 Mini open-weight?

No, it is proprietary: access is only through provider APIs.