OpenAITextTXT · CHAT · 2026

gpt-5.5

Frontier model for deep reasoning and agentic work.

OpenAI's frontier model for agentic workloads — planning, code, and multi-step tool calling with fast throughput.

Start creating →API reference

Specs

Context window256K tokens

Max output32K tokens

Tool useNative

Avg latency~1.2s first token

Capabilities

AgenticCodingReasoningFast

Sample prompt

“Plan and execute a 5-step research task using web tools.”

Pricing

$10 / $30 per 1M tokens · in / out

See pricing →

API

Call it in one request

curl https://api.aperture.network/v1/chat/completions \
  -H "Authorization: Bearer $APERTURE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"gpt-5-5","messages":[{"role":"user","content":"Plan and execute a 5-step research task using web tools."}]}'