GPT-5.5 Pro

proprietary

GPT-5.5 Pro uses more compute to think harder and provide consistently better answers.

Intelligence
Reasoning
Speed
Context
1.1M
Max output
128K
Input price
$30/1M tokens
Output price
$180/1M tokens
Snapshotsgpt-5.5-pro-2026-04-23

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Batch Processing

Details

Model IDgpt-5.5-pro
Provider OpenAI
Creator openai
Familygpt-5.5
Licenseproprietary
Statusactive
Typechat
Input modalitiestext, image
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window1.1M tokens
Max input—
Max output128K tokens
Reasoning tokensYes
Knowledge cutoff
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs
Web Searchweb_search
Search the web for information
File Searchfile_search
Search across uploaded files
Image Generationimage_generation
Generate images inline
Code Interpretercode_interpreter
Execute code in a sandbox
Hosted Shellhosted_shell
Run shell commands in a container
MCPmcp
Connect to Model Context Protocol servers

Endpoints

ResponsesPOST
Stateful multi-turn conversationshttps://api.openai.com/v1/responses
BatchPOST
Async batch processing at lower costhttps://api.openai.com/v1/batches

Pricing

Text tokensPer 1M tokens
InputOutputCached input30m write12h write
Standard$30$180———
Batch$15$90———

Family Comparison: gpt-5.5

ModelContextMax outPricing
GPT-5.51.1M128K$5$30
GPT-5.5 Pro1.1M128K$30$180

API

GET/v1/models/openai/gpt-5.5-pro