GPT-5.5

OpenAI

OpenAI's flagship GPT-5.5 — strong agentic, coding and tool-use. 1M context; input above 272K tokens billed at 2x input / 1.5x output.

Text Generation API Latest GPT Family v5.5

Documentation Back to Models

Parameters

params

Context Window

1.0M

tokens

Max Output

tokens

Input Price

per 1M tokens

Output Price

$30

per 1M tokens

GPT Family 18 models

The full GPT line by generation — pricing and capabilities vary across the family.

GPT-5.5

GPT-5.5 Instant

Everyday assistant, low-latency chat

Hardest reasoning, research, complex coding

$30 / $180

in / out · 1M

Apr 2026

GPT-5.5 Current Latest

Agentic workflows, coding, research, data analysis

$5 / $30

in / out · 1M

Apr 2026

GPT-5.4

GPT-5.4 Pro

Complex reasoning, research, advanced analysis

General-purpose, reasoning, multimodal, document editing

GPT-5.3

Code generation, software engineering, reasoning

GPT-5

Multimodal reasoning, reduced hallucinations

GPT-5.1

Fast, warm responses, customizable tone

Complex reasoning, persistent problem-solving

GPT-4

Multimodal, fast, versatile

Complex tasks, vision, analysis

Enterprise Azure integration

$2.5 / $10

in / out · 1M

o1 Preview

Complex reasoning, math, code

STEM reasoning, efficient

GPT-3.5

Capabilities

👁️

Vision

⚡

Function Calling

📋

JSON Mode

🌊

Streaming

💬

System Prompt

🖥️

Code Execution

🔍

Web Search

🔌

MCP Support

Details

Release Date: April 23, 2026
Knowledge Cutoff: December 1, 2025
Source: API
API Key Required: Yes
License: Proprietary
Model ID: gpt-5.5

Last updated: May 27, 2026