ModelOpenAI · Joined Apr 24, 2026 · GPT-5.x

GPT-5.5 Pro

Model at OpenAI

10th of 270 on Epoch Capabilities Index
Most expensive of 5 similar models by price

GPT-5.5 Pro does not have a researched profile yet. Everything here comes from its recorded changes and public listings, each linked to its source.

The basics

As of Nov 1

Status: Available
Price: $30 in, $180 outPer 1M tokens, since Apr 24
Context: 1.05M tokens
Open weights: No

Updates

Apr 24

New release

GPT-5.5 and GPT-5.5 Pro released in the API

GPT-5.5 shipped to the Chat Completions and Responses APIs, with GPT-5.5 Pro on the Responses API. Reasoning effort defaults to medium, and caching for GPT-5.5 only works with extended prompt caching.

Full changelog, by month

Role

General-purpose model at OpenAI

GPT-5.5 ProCurrent
Apr 2026 to now · 7 months
GPT-5 ProOct 2025 to Apr 2026 · 6 months

Similar models

gpt-5-6-cyber

Model

GPT-5.6 Luna

$0.20 in, $1.20 out

GPT-5.6 Sol

$4 in, $20 out

Similar models for now. Real viewing data comes after launch.

Cost vs peers

Most expensive of 5 similar models by output price.

GPT-5.6 Luna$1.20 out · $0.20 in
GPT-5.6 Terra$12 out · $2 in
GPT-5.6 Sol$20 out · $4 in
GPT-5.5$30 out · $5 in
GPT-5.5 Pro$180 out · $30 in

Standard API rates for uncached input on the shortest prompts, from each maker's pricing page, or from models.dev for models not researched here yet.

Where it works

Place	Type	Price per 1M tokens, in / out	Uptime
OpenAI	API host	$15 / $90

Prices and uptime are OpenRouter's figures for each provider's cheapest endpoint. Uptime covers the last 24 hours.

Benchmarks

Higher is better. Green is GPT-5.5 Pro. Dark marks are similar models.

Independent

What people say

Reviews

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