Benchmark

Autonomous time horizon

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Welcome to December 13, 2025 (theinnermostloop.substack.com)

A duration rather than a score, which is why the corpus can read a doubling time off it.

Development timeline

Newest reporting dates first. Reporting dates may differ from event dates.

2025-12-22: Autonomy horizons now correlate with reasoning benchmarks

2025-12-20: METR puts Opus 4.5 at a 4h49m autonomy horizon

2025-12-13: Gemini 3 Pro reaches a 4.9-hour autonomous horizon

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Epoch AI

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Autonomous time horizon
Innermost Loop KB — secondary record
Reporting date: unknown
KB permalink: https://nicholsn.github.io/innermost-loop-kb/benchmarks/autonomous-time-horizon
Attributed sources:
- Welcome to December 13, 2025 — https://theinnermostloop.substack.com/p/welcome-to-december-13-2025
This citation does not imply independent verification of linked-source claims.

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