Benchmark

CoBench 2.1

Sources

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

Welcome to September 29, 2026 (theinnermostloop.substack.com)
Source linked by the September 29 issue (x.com)

Evaluation referenced in a comparison between Opus 5.5 and Anthropic’s researcher-replacement threshold.

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2026-09-29: A commentator compares Opus with a researcher-replacement threshold

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Related to

CoBench v2

Referenced by

Claude Opus 5.5

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CoBench 2.1
Innermost Loop KB — secondary record
Reporting date: unknown
KB permalink: https://nicholsn.github.io/innermost-loop-kb/benchmarks/cobench-2-1
Attributed sources:
- Welcome to September 29, 2026 — https://theinnermostloop.substack.com/p/welcome-to-september-29-2026
- Source linked by the September 29 issue — https://x.com/chrisgpt/status/2104070917835927966
This citation does not imply independent verification of linked-source claims.

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