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

Capabilities

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

Details

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

Pricing

Input
$30
Output
$180
Cache write
—
Cache read
$30
Batch in
—
Batch out
—

Family Comparison: gpt-5.5

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

API

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