# Fable 5 low-effort run, 2026-06-10

## Two subsets

**`valid_cids.txt`** — 36,576 cells from the 6 envelopes that work for Fable's adaptive
thinking: english_strict, english_casual, python_typed, json_schema, french_casual,
chinese_casual. These use the same envelopes as Opus 4.8's 2026-05-29 run and are
apples-to-apples comparable.

**`hijack_cids.txt`** — 135,479 cells from the 23 bare-grammar envelopes that broke.
At adaptive thinking + effort=low, Fable interprets short ambiguous prompts (X | Y,
X / Y, X or Y, X ^ Y, single-character disjunction, etc.) as topic-comparison requests
and writes long essays — often inventing entirely different topic pairs. This is the
"Fable Hijack Corpus" — a research dataset on adaptive-thinking model behavior under
sub-instruction grammar.

## Costs (token-based, batch pricing)
- Valid subset:   $49.37  (3.2%)  — the SmokingMirror experiment
- Hijack corpus:  $1,487.37 (96.8%) — the unintended research artifact
- Total:          $1,536.74  (reported invoice: $1,563)

