LLM Perks

GPT-4o

OpenAI · All GPT models
Free right now Frontier
VisionTool use

GPT-4o is a language model from OpenAI. It is currently free at 1 provider with up to 128K tokens of context. The model understands images, supports tool calling.

Developer
OpenAI
Context
128K tokens
Type
Text
License
Proprietary
Free since
September 22, 2026

Where to use GPT-4o for free

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

ProviderContextLimitCard
UnoRouter
gpt-4o:free
128K 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": "gpt-4o:free",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

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

Benchmarks

This model is not on the Artificial Analysis leaderboard yet. We do not publish our own estimates.

Similar free models

FAQ

Is GPT-4o free?

Yes. As of October 26, 2026, GPT-4o is free at UnoRouter. Each provider has its own limits — see the table above.

What is the context window of GPT-4o?

The largest context among free routes is 128,000 tokens. Some providers cap it lower.

How do I call GPT-4o via API?

Use any OpenAI-compatible client with base URL https://api.unorouter.com/v1, model ID gpt-4o:free, and a UnoRouter key.

Is GPT-4o open-weight?

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