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anthropic's hle lead hits 16 points – and it's still accelerating

pulse Illustrated scientist at chalkboard with numbers 59, 16, and 43 beside a rising curve, representing HLE benchmark scores

fable 5 just put 16 points between anthropic and openai on hle

• anthropic fable 5: 59%
• openai gpt 5.5: 43.1%

that's a 15.9 point gap

since november, anthropic has gone 30.8 → 59, gaining roughly 4 points a month and still accelerating.
openai's last two releases moved 42.7 → 43.1, essentially flat.

closing a lead that size would take a single jump larger than anything either lab has posted so far – not the current trend

Line chart comparing Anthropic and OpenAI HLE accuracy from Aug 2025 to Jun 2026, Fable 5 reaching 59% while GPT 5.5 plateaus at 43.1%

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