Stone to Silicon

Artificial intelligence · April 2026

GPT-5.5

OpenAI pushes into research-level mathematics.

GPT-5.5 scored 82.7% on Terminal-Bench 2.0 and 35.4% on FrontierMath Tier 4, the hardest tier of a benchmark written by working mathematicians.

See it in the living treeWikipediaSource

Arcs above join it to what it stood on, arcs below to what it led to. The bar places this stretch on the tree's whole timeline.

What it built on 1

What it led to 2

Related measurements

The dashed line marks when it first worked.

Best AI score on GPQA Diamond Latest: 95.8 % correct (2026) Source: Epoch AI, Capabilities & benchmarking (benchmark_data.zip, gpqa_diamond.csv); Anthropic: Claude 3 public launch (March 4, 2024)

Training compute of notable AI models Source: Epoch AI, Notable AI Models (CC BY 4.0)