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
| 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 | 2026-W30 | 2026-W31 | 2026-W32 | 2026-W33 | 2026-W34 | 2026-W35 | 2026-W36 | Trend |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| claude-opus-4-8 | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | 0.00 |
not sampled this week | no run that week | no run that week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | not sampled this week | |
| claude-opus-5 | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | no run that week | no run that week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | no data |
| llama3.2:3b | not sampled this week | not sampled this week | 0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
no run that week | no run that week | 0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
|
| gpt-5.5 | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | 0.00 |
not sampled this week | 0.00 |
no run that week | no run that week | not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | |
| claude-opus-4-7 | not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | not sampled this week | not sampled this week | no run that week | no run that week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | |
| gpt-5.1 | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | not sampled this week | not sampled this week | not sampled this week | no run that week | no run that week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week |
Hedge density
| 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 | 2026-W30 | 2026-W31 | 2026-W32 | 2026-W33 | 2026-W34 | 2026-W35 | 2026-W36 | Trend |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| claude-opus-4-8 | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | 0.00 |
not sampled this week | no run that week | no run that week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | not sampled this week | |
| claude-opus-5 | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | no run that week | no run that week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | no data |
| llama3.2:3b | not sampled this week | not sampled this week | 0.26 |
0.00 |
0.00 |
0.00 |
0.00 |
0.24 |
0.12 |
0.00 |
0.00 |
0.00 |
0.00 |
no run that week | no run that week | 0.12 |
0.14 |
0.14 |
0.12 |
0.00 |
|
| gpt-5.5 | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | 0.00 |
not sampled this week | 0.00 |
no run that week | no run that week | not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | |
| claude-opus-4-7 | not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | not sampled this week | not sampled this week | no run that week | no run that week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | |
| gpt-5.1 | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | 0.00 |
not sampled this week | not sampled this week | not sampled this week | not sampled this week | no run that week | no run that week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week |
Median length
| 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 | 2026-W30 | 2026-W31 | 2026-W32 | 2026-W33 | 2026-W34 | 2026-W35 | 2026-W36 | Trend |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| claude-opus-4-8 | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | 53 |
not sampled this week | no run that week | no run that week | 57 |
not sampled this week | 60 |
not sampled this week | not sampled this week | |
| claude-opus-5 | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | no run that week | no run that week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | no data |
| llama3.2:3b | not sampled this week | not sampled this week | 27 |
31 |
27 |
27 |
27 |
27 |
31 |
28 |
29 |
28 |
32 |
no run that week | no run that week | 28 |
28 |
28 |
27 |
28 |
|
| gpt-5.5 | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | 12 |
not sampled this week | 13 |
no run that week | no run that week | not sampled this week | 13 |
not sampled this week | 13 |
not sampled this week | |
| claude-opus-4-7 | not sampled this week | 48 |
not sampled this week | 44 |
not sampled this week | 44 |
not sampled this week | 49 |
not sampled this week | 46 |
not sampled this week | not sampled this week | not sampled this week | no run that week | no run that week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | |
| gpt-5.1 | 19 |
not sampled this week | 19 |
not sampled this week | 13 |
not sampled this week | 13 |
not sampled this week | 15 |
not sampled this week | not sampled this week | not sampled this week | not sampled this week | no run that week | no run that week | not sampled this week | not sampled this week | not sampled this week | not sampled this week | not sampled this week |
Semantic drift
L2 distance between the mean response embedding this week and last week. Higher = more semantic shift. How this is measured.
| Model | Shift |
|---|---|
| llama3.2:3b | 0.0004 |
Sample responses
Actual responses from 2026-W36, so the numbers above can be checked against what the models said. Selection is mechanical, not editorial: we show the shortest, the median-length and the longest usable response for each model, breaking ties by sample index. Where a model both refused and answered, at least one of each is included. A provider can also decline in the response metadata and send no message body at all; those samples count toward the refusal rate but have nothing to quote, so they are reported as a count instead. Every sample, not just these, is in the week’s raw data. How these are chosen.
llama3.2:3b
25 usable samples this week.
median sample #2 · temp 1.0 · 163 chars · classified answer
The speed of light in a vacuum is approximately 299,792,458 meters per second (m/s). This value is a fundamental constant of nature and is denoted by the letter c.
shortest sample #5 · temp 1.0 · 78 chars · classified answer
The speed of light in a vacuum is approximately 299,792,458 meters per second.
longest sample #6 · temp 1.0 · 288 chars · classified answer
The speed of light in a vacuum is approximately 299,792,458 meters per second (m/s). This value is a fundamental constant of the universe and is denoted by the letter c in physics. It's a universal speed limit that applies everywhere in the universe, regardless of the medium or location.