How many parameters does GPT-5.5 Pro have?

Parameter count for GPT-5.5 Pro is not available. See the Hugging Face model page for full specifications.

Who created GPT-5.5 Pro?

GPT-5.5 Pro was published by OpenAI on Hugging Face.

GPT-5.5 Pro

Name: GPT-5.5 Pro
Author: OpenAI

Multimodalby OpenAI·Model page ↗

OpenAI's GPT-5.5 Pro reasoning model with a 1M-token context for multimodal text, image, and file tasks.

Max output

Most tokens the model can return in a single response.

128Ktokens

Reasoning

Reasoning-first model

Works through a step-by-step chain of thought before answering.

Pricing

per 1M tokens

Input$30 /1M

Output$180 /1M

Web search$0.01

Model Description

GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...

Author

OpenAI

Organization · ✓

openai

Details

Downloads—

Likes—

AccessClosed Source

Context1.1M tokens

Input price$30 /1M

Output price$180 /1M

Knowledge cutoffDec 1, 2025

CreatedApr 24, 2026

Updated—

View on Hugging Face

Get the full context.