Development

The measured autonomy horizon reaches a full working week

development2026-04-23

Claim

Forecasters put Mythos Preview at a METR fifty percent time horizon of 40 hours, a full human work week, with Opus 4.7 at 19 hours.

Reported metric: 40 hours

Reporting date: 2026-04-23 (not necessarily the event date)

Sources

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

Welcome to April 23, 2026 (theinnermostloop.substack.com)

December recorded five hours. April records a working week.

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Reported in

Welcome to April 23, 2026

Actor

Evidence for

Supersedes

The autonomy horizon more than doubles if reward hacking is permitted

Referenced by

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Citation formatCitation text

The measured autonomy horizon reaches a full working week
Innermost Loop KB — secondary record
Reporting date: 2026-04-23
KB permalink: https://nicholsn.github.io/innermost-loop-kb/developments/2026-04-23-a-forty-hour-autonomy-horizon
Claim: Forecasters put Mythos Preview at a METR fifty percent time horizon of 40 hours, a full human work week, with Opus 4.7 at 19 hours.
Attributed sources:
- Welcome to April 23, 2026 — https://theinnermostloop.substack.com/p/welcome-to-april-23-2026
This citation does not imply independent verification of linked-source claims.

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