Opus, Fable and Sonnet each spent an hour building the same RPG — play them blind
Miserable_Tiger_5742 · reddit · 2026-10-05
At readers' request, the author had Opus 5.5, Fable 5.1 and Sonnet 5.5 (all on Max effort) build a turn-based RPG from the same prompt: character creation, turn-based combat, leveling or loot, win and lose states, playable on a phone in 5 minutes.
- Build times ranged from just under an hour to about 90 minutes. 51 minutes in, the author's machine ran out of memory, so all three received the same "pick up where you left off" message and finished from there; files were otherwise untouched.
- Weird coincidence: all three independently worked the word "ember" into their games despite not seeing each other's folders.
The games are shuffled as A/B/C for blind play and voting before revealing which model made which: locust.lol/arena/rpg.
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