LLM ReferenceLLM Reference

GPT-5.5 Pro

ProprietaryMultimodal

About

GPT-5.5 Pro is OpenAI's premium variant of GPT-5.5, released April 23, 2026. Targets large quality gains for business, legal, education, and data science use cases. Scores 39.6% on FrontierMath Tier 4 (postdoctoral-level math problems), compared to 22.9% for Claude Opus 4.7. Priced at 6× the standard GPT-5.5 API rate. Available to ChatGPT subscribers and via API.

Capabilities

VisionMultimodalReasoningFunction CallingTool UseStructured OutputsCode Execution

Providers(1)

ProviderInput (per 1M)Output (per 1M)Type
OpenAI API$30$180Serverless

Rankings

Best LLMs for Code GenerationBest Multimodal / Vision LLMsBest LLMs for Reasoning & MathBest LLMs for Function Calling & Tool UseCheapest LLM APIsBest LLM APIsBest LLMs for EnterpriseBest LLMs for WritingBest LLMs for Customer Support

Compare

All comparisons →
GPT-5.5 Pro vs Claude Opus 4.7GPT-5.5 Pro vs GPT-5.5GPT-5.5 Pro vs GPT-5.4

Specifications

FamilyGPT-5.5
Released2026-04-23
Context1M
ArchitectureDecoder Only
Specializationgeneral
LicenseProprietary

Created by

OpenAIOpenAI

Cutting-edge research and development.

San Francisco, California, United States
Founded 2015
Website

Providers(1)

OpenAI API

Links

Website