GPT-5.5

Name: GPT-5.5 API
Brand: OpenAI
Availability: InStock

gpt-5.5

Cheaper. More stable. One-stop API aggregation.

Introduction

GPT-5.5 is the general OpenAI flagship for everyday production traffic: chat, summarization, extraction, and multi-step agents.

LumeAPI exposes it at half official list price ($2.50 / $15.00 per 1M in/out).

Wire it exactly like OpenAI Chat Completions — same messages schema, streaming, and tool calls — with only the base URL and API key changed to LumeAPI.

Pricing

Official$5.00 / $30.00

LumeAPI$2.50 / $15.00

per 1M tokens (in/out)

Endpoint

Base URL: https://api.lumeapi.site/v1

Auth: Authorization: Bearer <your-lumeapi-key>

Developer docs

Open the integration notes for this model, or the modality guide for request fields and polling.

Model docs All model docs Agent docs (llms.txt)

curl https://api.lumeapi.site/v1/chat/completions \
  -H "Authorization: Bearer $LUMEAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5",
    "messages": [{"role":"user","content":"Hello"}]
  }'

Create API key