AI 23 Oct 2026

The two smartest AIs are 0.02 points apart

The top two AI models on Epoch's Capabilities Index are separated by just 0.02 points.

Epoch AI's Capabilities Index combines 50+ benchmarks into one scale. On its latest update (22 Oct 2026), Claude Opus 5.5 scores 168.83 and GPT-6 Astra 168.81 — a 0.02-point gap, with the top three within 0.46. For context, GPT-4 (Mar 2023) scores 125.74 and LLaMA-65B (Feb 2023) 109.97.

• Claude Opus 5.5: 168.83
• GPT-6 Astra: 168.81 (gap 0.02)
• Top three within 0.46
• GPT-4 (Mar 2023): 125.74

Benchmark scores carry uncertainty, so small gaps should not be over-read.