GPT 5.5
OpenAI
openai/gpt-5.5
Latest frontier, 1M context
Context Window
1.1M
1,050,000 tokens
Max Output
128K
128,000 tokens
About this model
GPT-5.5 is OpenAI's latest frontier model for complex professional work, coding, long-context reasoning, and agentic tool use. It supports text and image input, up to 128K output tokens, and a 1.05M context window.
Access it through Chuizi.AI with OpenAI-compatible APIs and a single ck- API key.
Highlights
1M context
128K output
Highest reasoning tier
Tool calling
Best For
Complex codingProfessional researchLong-document analysisAgent workflows
2026-04-23
Capabilities
ChatVisionReasoningCodepdftoolscache
Pricing (per 1M tokens)
| Pricing (per 1M tokens) | / 1M tokens |
|---|---|
| Input / 1M | $5.25 |
| Output / 1M | $31.50 |
| Cache Read | $0.525 |
Final prices shown
Quick Start
main.py
from openai import OpenAI client = OpenAI( base_url="https://api.chuizi.ai/v1", api_key="ck-your-key-here", ) response = client.chat.completions.create( model="openai/gpt-5.5", messages=[{"role": "user", "content": "Hello!"}], ) print(response.choices[0].message.content)