gpt-5.5

proprietary

GPT-5.5 is a flagship model for the most complex professional work. Learn more in our GPT-5.5 model guidance. Reasoning.effort supports: none, low, medium (default), high and xhigh.

Intelligence
Reasoning
Speed
Context
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

Provider Vercel AI Gateway
Creator OpenAI
Familygpt-5.5
Licenseproprietary
Statusactive
Typechat
Input modalitiestext
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window1M 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
—
Batch in
—
Batch out
—

Family Comparison: gpt-5.5

ModelContextMax outPricing
gpt-5.51M128K$5$30
gpt-5.5-pro1M128K$30$180

API

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

gpt-5.5

GPT-5.5 is a flagship model for the most complex professional work. Learn more in our GPT-5.5 model guidance. Reasoning.effort supports: none, low, medium (default), high and xhigh.

Changes · 1 entries
openai/gpt-5.5createc8065d6Apr 25, 2026, 10:39 AM