What are the strengths of this model?

Extremely long context length Advanced reasoning capabilities provided Latest architecture from OpenAI

What are the weaknesses of this model?

Closed-source model Restricted use licensing Opaque internal model details

What are the best use cases?

Analysis and summarization of extensive documents Complex logical reasoning tasks Contextual processing of large-scale data

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OpenAIProprietary

GPT-5.5 Pro

Name: GPT-5.5 Pro
Price: 30 USD
Author: OpenAI

GPT-5.5 Pro, developed by OpenAI, is a foundation model with advanced reasoning capabilities. It supports an extremely long context window of 1000K tokens.

Parameters

Undisclosed

Context Window

1000K

License

Proprietary

Release Date

2026-04-23

API Pricing

Input Price (per 1M tokens)

$30

Output Price (per 1M tokens)

Billing Mode: standard

Strengths

・Extremely long context length
・Advanced reasoning capabilities provided
・Latest architecture from OpenAI

Weaknesses

・Closed-source model
・Restricted use licensing
・Opaque internal model details

Use Cases

・Analysis and summarization of extensive documents
・Complex logical reasoning tasks
・Contextual processing of large-scale data

Deep Analysis

Release Date

April 24, 2026

Overall Score

100 (provisional)

BrowseComp

90.1%

Context Window

1M tokens

Pricing

$30.00 / $180.00 per 1M tokens

Strengths

・Highest provisional score (100)
・Best agentic performance (BrowseComp 90.1%)
・1M context window

Weaknesses

・Extremely expensive at $30/$180
・Weaker on Knowledge than GPT-5.5

Competitor Comparison

Model	GPQA	Price
GPT-5.5	93.6%	$5/$30

Sources

GPT-5.5 Pro

Analysis generated: 2026-05-24