OpenAI: GPT-5.5

proprietary

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks.

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

Capabilities

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

Details

Model IDopenai/gpt-5.5
Provider OpenRouter
Creator OpenAI
Familygpt-5.5
Licenseproprietary
Statusactive
Typechat
Input modalitiesimage, text
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

Pricing

Input
$5
Output
$30
Cache write
—
Cache read
$0.5
Batch in
—
Batch out
—

Family Comparison: gpt-5.5

ModelContextMax outPricing
OpenAI: GPT-5.5 (batch)1.1M128K$2.5$15
OpenAI: GPT-5.51.1M128K$5$30
OpenAI: GPT-5.5 Pro (batch)1.1M128K$15$90
OpenAI: GPT-5.5 Pro1.1M128K$30$180

API

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