# Apertis Changelog: 2.2.53 — Models Added

Canonical page: https://apertis.ai/changelog/2.2.53
Markdown mirror: https://apertis.ai/changelog/2.2.53.md
Version: 2.2.53
Title: Models Added
Published: 2026-04-24
Category: feature

Add GPT-5.5 & GPT-5.5 Pro

## Highlights

- GPT-5.5
- GPT-5.5 Pro

## Details

## GPT-5.5

GPT-5.5 is OpenAI's frontier model for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on challenging tasks. It supports text and image inputs and features a 1M+ token context window (≈922K input, 128K output) for large-scale, high-context workflows. 

Designed for advanced applications, GPT-5.5 excels in reasoning, coding, and multimodal workflows, enabling efficient execution of complex, multi-step tasks within a single system.

## GPT-5.5 Pro

GPT-5.5 Pro is OpenAI's high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It supports text and image inputs and features a 1M+ token context window (≈922K input, 128K output) for handling large-scale, long-context tasks. 

Designed for long-horizon problem solving, agentic coding, and precise multi-step execution, GPT-5.5 Pro delivers strong reliability and performance across advanced engineering, research, and complex workflow scenarios.

**Enjoy them.**