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GPT-5.5
OpenAI's newest frontier model. A new class of intelligence for coding and professional work with a 1M+ token context window, reasoning with effort control, and native tool support.
Web Search
Code Interpreter
File Search
Specifications
| Provider | OpenAI |
| Category | Text |
| Context window | 1.1M tokens |
Pricing (Starter tier)
650.00 credits / 1M input tokens
3,900.00 credits / 1M output tokens
Higher tiers get volume discounts. See tiers
Quick Start
curl -N https://query.genx.sh/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"gpt-5.5","messages":[{"role":"user","content":"Analyze this codebase and suggest architectural improvements"}],"max_tokens":8192,"stream":true}'
Parameters
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
prompt |
string | required | — | The input text prompt |
system_prompt |
string | optional | — | System instructions for the model |
max_tokens |
number | optional | 16384 |
Maximum tokens to generate (up to 128k) |
image_url |
string | optional | — | URL of an image to analyze |
tools |
array | optional | — | Builtin tools: web_search, code_interpreter, file_search |
reasoning_effort |
string | optional | — | Reasoning effort: none, low, medium, high, xhigh |