LLM Perks

GPT 5.5

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

GPT 5.5 is a language model from OpenAI. It is currently free at 1 provider with up to 1.1M tokens of context. The model understands images, supports tool calling.

Developer
OpenAI
Context
1.1M tokens
Type
Text
License
Proprietary
Free since
October 13, 2026

Where to use GPT 5.5 for free

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

ProviderContextLimitCard
UnoRouter
gpt-5.5:free
1.1M 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-5.5:free",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

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

Benchmarks

Intelligence Index
38.4
GPQA Diamond
93.5%
Humanity's Last Exam
45.8%
Terminal-Bench Hard
60.6%
τ²-Bench
93.9%
Long context (LCR)
84.3%

Source: Artificial Analysis · GPT-5.5 (Xhigh)

Similar free models

FAQ

Is GPT 5.5 free?

Yes. As of October 13, 2026, GPT 5.5 is free at UnoRouter. Each provider has its own limits — see the table above.

What is the context window of GPT 5.5?

The largest context among free routes is 1,100,000 tokens. Some providers cap it lower.

How do I call GPT 5.5 via API?

Use any OpenAI-compatible client with base URL https://api.unorouter.com/v1, model ID gpt-5.5:free, and a UnoRouter key.

How good is GPT 5.5?

Artificial Analysis Intelligence Index: 38.4, GPQA Diamond: 94%. For comparison, the strongest free model in the catalog right now is Claude Opus 5.5.

Is GPT 5.5 open-weight?

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