Model Comparison

Fable 5.1 vs Opus 3

Fable 5.1 ranks #6 on the AI IQ leaderboard with an estimated IQ of 137, while Opus 3 ranks #175 on the AI IQ leaderboard with an estimated IQ of 80. The table below puts the two models side by side across the seven capability dimensions, emotional reasoning, cost, speed, and context window.

Fable 5.1 profile →Opus 3 profile →

First model Second model

Where They Sit on the IQ Bell Curve

Both models highlighted on the standard normal IQ distribution of every tracked model

IQ Dimensions Head to Head

The seven scored Composite IQ dimensions, side by side

Domains Head to Head

Applied domain composite scores where at least one model is measured

	Fable 5.1Anthropic	Opus 3Anthropic
Rank	#6	#175
IQ	137	80
Abstract Reasoning	124	75
Mathematical Reasoning	147	71
Academic Reasoning	136	92
Programmatic Reasoning	146	79
Computer Use	141	75
Reliability	135	86
Knowledge Work	132	79
Emotional Reasoning	—	—
Effective Cost / 1M Tokens	$91.05	$51.65
Sticker Price / 1M I/O Tokens	$60.00	$90.00
Speed	70 tok/s	—
Context Window	1M	—
Released	2026-09-01	2024-03-04
Open Weights	No	No

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