gpt-5.5-2026-04-23

proprietary

GPT-5.5 is a flagship model for the most complex professional work.

Intelligence
Reasoning
Speed
Context
1.1M
Max output
128K
Input price
$5/1M tokens
Output price
$30/1M tokens
Alias ofgpt-5.5

Capabilities

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

Details

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

Endpoints

Chat CompletionsPOST
Generate chat responses with messageshttps://api.openai.com/v1/chat/completions
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
InputCached inputOutput30m write12h write
Standard$5$0.5$30——
Batch$2.5$0.25$15——
Fast$12.5$1.25$75——

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-5.5-2026-04-23