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Code reasoning

Anthropic Claude Haiku 4.5

anthropic/claude-haiku-4.5

Open Opened 2026-08-05 17:39:04 UTC

Fixed public statement

Behavioral change evidence

Estimated effect size (frozen null floor minus observed panel mean): 0.700, with a 95% anytime-valid uncertainty interval [-0.161, 0.700]. statistically significant behavioral change detected. Methodology.

Observed via aggregator: through an aggregator serving layer, not a direct adapter.

Anytime-valid evidence

E-value trajectory

E-value at open
20.829
log₁₀ E at open
1.319
Onset estimate
5

The onset is a diagnostic estimate of the first affected post-calibration observation. Statistical validity attaches to the e-process alarm, not to this estimate.

E-value trajectoryBase-ten logarithm of the e-value after calibration. The red line marks the configured alarm threshold. log10 E Completed panel 0.0 1.0 2.0 3.0 0 2 4 6 8 10
The trajectory plots log₁₀ E through the incident epoch. The red line is the configured 1/α alarm threshold.

Audit trail

Epoch lineage

Incident epoch
5dad03b2-09b2-49a3-bdf7-ccfaf3543703
Pool version
code_reasoning-v4
Checker version
code_reasoning-v2
Previous epoch
a4d45cef-6c8c-4239-8d1f-35fc2033c630
Epoch transition
checker_refresh
View model status →

Citing this incident: link this page and name the UTC day. The register is append-only — corrections are published beside the entry, never over it — so a dated citation stays true. The evidence bundle above replays offline.