LLM Perks

GPT 4.1

OpenAI · All GPT models
Free right now Frontier New
Tool useLong context

GPT 4.1 is a language model from OpenAI. It is currently free at 1 provider with up to 1M tokens of context. The model supports tool calling.

Developer
OpenAI
Context
1M tokens
Type
Text
License
Proprietary
Free since
October 11, 2026

Where to use GPT 4.1 for free

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

ProviderContextLimitCard
UnoRouter
gpt-4.1:free
1M 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-4.1:free",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

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

Benchmarks

Intelligence Index
12.7
GPQA Diamond
66.6%
Humanity's Last Exam
4.2%
Terminal-Bench Hard
13.6%
τ²-Bench
47.1%
Long context (LCR)
68.3%

Source: Artificial Analysis · GPT-4.1

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FAQ

Is GPT 4.1 free?

Yes. As of October 11, 2026, GPT 4.1 is free at UnoRouter. Each provider has its own limits — see the table above.

What is the context window of GPT 4.1?

The largest context among free routes is 1,000,000 tokens. Some providers cap it lower.

How do I call GPT 4.1 via API?

Use any OpenAI-compatible client with base URL https://api.unorouter.com/v1, model ID gpt-4.1:free, and a UnoRouter key.

How good is GPT 4.1?

Artificial Analysis Intelligence Index: 12.7, GPQA Diamond: 67%. For comparison, the strongest free model in the catalog right now is GLM 5.3.

Is GPT 4.1 open-weight?

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