Development

Opus 5.5 leads the Artificial Analysis index

development2026-09-24benchmarks

Claim

The issue reports Opus 5.5 debuting first on the Artificial Analysis index while producing three times the median output length.

Reported metric: #1; thrice as wordy

Reporting date: 2026-09-24 (not necessarily the event date)

Sources

Attribution and reporting linked by this record; links do not imply independent verification.

Welcome to September 24, 2026 (theinnermostloop.substack.com)
Source linked by the September 24 issue (artificialanalysis.ai)

Indexed from the September 24 newsletter. Linked-source claims have not been independently verified.

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Reported in

Welcome to September 24, 2026

Actor

Artificial Analysis

Referenced by

Welcome to September 24, 2026

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Citation formatCitation text

Opus 5.5 leads the Artificial Analysis index
Innermost Loop KB — secondary record
Reporting date: 2026-09-24
KB permalink: https://nicholsn.github.io/innermost-loop-kb/developments/2026-09-24-opus-index
Claim: The issue reports Opus 5.5 debuting first on the Artificial Analysis index while producing three times the median output length.
Attributed sources:
- Welcome to September 24, 2026 — https://theinnermostloop.substack.com/p/welcome-to-september-24-2026
- Source linked by the September 24 issue — https://artificialanalysis.ai/models/claude-opus-5-5
This citation does not imply independent verification of linked-source claims.

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