GPT-5.5 Pro

Leads FrontierMath Tier 4 at 39.6% — best for hardest math and physics problems.

GPT-5.5 Pro is the highest-performance OpenAI model for quantitative reasoning, leading FrontierMath Tier 4 at 39.6% — the most difficult math and physics benchmark currently used for large model evaluation. It is the recommended model for research-grade mathematical problem solving, competitive math, and advanced physics simulations. The premium pricing reflects its high compute cost per inference.

GPT-5.5 Pro

Made by

OpenAI

Released

2026

Context Window

Large

Pricing

Premium / high-compute

Provider

OpenAI