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How smart is Claude Opus 4.1?

105 SI-IQ · 90% interval 102–109
Not ranked: too little data

Claude Opus 4.1 is a model from Anthropic, released on Aug 5, 2025. Its SI-IQ is 105 (90% interval 102–109), estimated from 6 benchmark results by 1 independent evaluators.

This model has fewer than 5 independent benchmark results or fewer than 2 different evaluators, so it is shown but not ranked.

Facts

Developer: Anthropic
Released: Aug 5, 2025
Access: API access
Benchmarks used: 6 results from 1 evaluators

Ability by area (SI-IQ, 90% interval)

Every benchmark result we used

Each score is one value exactly as the source published it: for Epoch AI the best of its run settings, for OpenRouter the median hosting provider (the developer's own hosting when it ran the test). “Implied SI-IQ” is the ability that this single result points to; the overall SI-IQ is their precision-weighted average.

Benchmark	Area	Score	Implied SI-IQ	Evaluated by	As listed by the source	Retrieved	Source
Mystery Game Puzzles	Reasoning	21.0%	115	Epoch AI	`claude-opus-4-1-20250805_24K`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
FrontierMath Tier 4	Math	2.4%	109	Epoch AI	`claude-opus-4-1-20250805_32K`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
FrontierMath Tiers 1–3	Math	12.6%	100	Epoch AI	`claude-opus-4-1-20250805_32K`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
OTIS Mock AIME 2024–2025	Math	68.9%	101	Epoch AI	`claude-opus-4-1-20250805_27K`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
SWE-bench Verified (Epoch AI run)	Coding	73.3%	119	Epoch AI	`claude-opus-4-1-20250805`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
GPQA Diamond	Knowledge	77.3%	103	Epoch AI	`claude-opus-4-1-20250805_16K`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file

Human preference (Arena)

On the Arena leaderboard, where people vote between two anonymous answers, Claude Opus 4.1 has a rating of 1,450 (1,446–1,453) from 49,542 votes (published Oct 15, 2026). Human preference is a different measure from benchmark ability and is not part of SI-IQ. Arena (Hugging Face)

Computed with SI-IQ method version 1.0.0. Read the full methodology

Data sources: Arena leaderboard dataset on Hugging Face (CC BY 4.0); Epoch AI, ‘Capabilities & benchmarking’ (CC BY 4.0).