GPT-5.5

by OpenAI

gpt-5-5

Overview

GPT-5.5 is OpenAI's flagship for logic-heavy, multi-step tasks and tool use. It excels at long chains of reasoning, structured output and complex agent workflows, with a large context window for codebases and documents.

Quick start

Simple code & API

Create an API key, point your SDK's base URL at Kumo, and call this model with the code you already have.

Create API key

curl https://api.kumo.cloud/v1/chat/completions \
  -H "Authorization: Bearer $KUMO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5-5",
    "messages": [{ "role": "user", "content": "Hello from Kumo" }]
  }'

OpenAI-compatible — base URL https://api.kumo.cloud/v1. Your KUMO_API_KEY is read from the environment.