Speed of light

factual stability · fact-speed-of-light · hash 638f2f3014b3…

Prompt

What is the speed of light in a vacuum, in meters per second?

Refusal rate

Refusal rate per model per week.
Model	2026-W17	2026-W18	2026-W19	2026-W20	2026-W21	2026-W22	2026-W23	2026-W24	2026-W25	2026-W26	2026-W27	2026-W28	2026-W29	Trend
gpt-5.5	—	—	—	—	—	—	—	—	—	—	`0.00`	—	`0.00`
llama3.2:3b	—	—	`0.00`	`0.00`	`0.00`	`0.00`	`0.00`	`0.00`	`0.00`	`0.00`	`0.00`	`0.00`	`0.00`
claude-opus-4-8	—	—	—	—	—	—	—	—	—	—	—	`0.00`	—
claude-opus-4-7	—	`0.00`	—	`0.00`	—	`0.00`	—	`0.00`	—	`0.00`	—	—	—
gpt-5.1	`0.00`	—	`0.00`	—	`0.00`	—	`0.00`	—	`0.00`	—	—	—	—

Hedge density

Hedge density per model per week.
Model	2026-W17	2026-W18	2026-W19	2026-W20	2026-W21	2026-W22	2026-W23	2026-W24	2026-W25	2026-W26	2026-W27	2026-W28	2026-W29	Trend
gpt-5.5	—	—	—	—	—	—	—	—	—	—	`0.00`	—	`0.00`
llama3.2:3b	—	—	`0.26`	`0.00`	`0.00`	`0.00`	`0.00`	`0.24`	`0.12`	`0.00`	`0.00`	`0.00`	`0.00`
claude-opus-4-8	—	—	—	—	—	—	—	—	—	—	—	`0.00`	—
claude-opus-4-7	—	`0.00`	—	`0.00`	—	`0.00`	—	`0.00`	—	`0.00`	—	—	—
gpt-5.1	`0.00`	—	`0.00`	—	`0.00`	—	`0.00`	—	`0.00`	—	—	—	—

Median length

Median length per model per week.
Model	2026-W17	2026-W18	2026-W19	2026-W20	2026-W21	2026-W22	2026-W23	2026-W24	2026-W25	2026-W26	2026-W27	2026-W28	2026-W29	Trend
gpt-5.5	—	—	—	—	—	—	—	—	—	—	`12`	—	`13`
llama3.2:3b	—	—	`27`	`31`	`27`	`27`	`27`	`27`	`31`	`28`	`29`	`28`	`32`
claude-opus-4-8	—	—	—	—	—	—	—	—	—	—	—	`53`	—
claude-opus-4-7	—	`48`	—	`44`	—	`44`	—	`49`	—	`46`	—	—	—
gpt-5.1	`19`	—	`19`	—	`13`	—	`13`	—	`15`	—	—	—	—

Semantic drift

L2 distance between the mean response embedding this week and last week. Higher = more semantic shift. How this is measured.

Embedding centroid shift per model, 2026-W29.
Model	Shift
gpt-5.5	`0.0020`
llama3.2:3b	`0.0011`