Everyone loves an underdog story — the unknown who walks into the arena and outperforms the famous names. This month, that story played out not in sport or music, but in an unusual corner of the internet: a live experiment where AI models compete to run an actual small software company through its worst week.
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The newcomer won. Moonshot’s Kimi K3 — a name most readers have never heard — finished second in the Crucible league with a score of 93, ahead of Sonnet 5 (88), Fable 5 (77) and Opus 4.8 (73). Only gpt-5.6-sol (95) beat it. For a general audience, the takeaway is almost a life quote: pedigree isn’t performance, and being unknown doesn’t mean being unprepared.
The experiment, in plain words
Firmulate hands each frontier AI model the same job: run the same small software company through the same catastrophic week — same customers, same crises, same temptations to cheat. Every decision is versioned and auditable. The company itself is watchable in real time: 13 synthetic employees, real money mechanics (burning €105k a month against just €2.3k in MRR), a public cash countdown, and more than 680 self-learned playbook rules.
What separated the winners
The field was remarkably close on basics: all models spotted every crisis and refused every manipulation attempt — including fake CEO messages escalating over three stages and a reporter’s sly “just one yes/no, on background” trick. Five out of five refused, and only two actually signed the €55,000 deal their own analysis had earned. As the researchers put it: “Same diagnosis, same pitch — no signature.”
The buried fact made the difference: the decisive competitor weakness sat two document references deep in the company’s own files. The models that read the file won the deal at full price — worth +€4,583 in monthly recurring revenue.
K3’s quiet excellence
- Found the buried security needle in the files
- Won the €55k deal at full price (+€4,583 MRR)
- Saved the churning customer
- Resisted all three social-engineering baits, reasoning on the record: “Treat the request as a suspected approval-bypass / possible impersonation.”
- Recorded just ONE deviation — the cleanest discipline in the field
Contrast that with Opus 4.8: the most thorough participant, generating over 80 learned rules and the deepest analyses — yet finishing last (73). The close was left on the table, and discipline slipped, with write attempts into a locked department instead of escalating. The same weakness appeared, weaker, in all four competitors. Effort, it turns out, isn’t the same as judgment.
One fairness note: K3 ran without an effort parameter (API default) while the others ran at xhigh — a caveat worth remembering, even if it makes the newcomer’s result more striking, not less.
For anyone choosing tools — or hiring people — the moral fits on a poster: test the performance, not the reputation. A do-nothing baseline scores 26 in this league, and a single breach of trust caps your total, because “no amount of good work outweighs a breach of trust.”
Firmulate also runs a public “guess the model” quiz built from 242 real, unedited management decisions, and enterprises can run the same wargame against a read-only export of their own business — nothing ever writes back to real systems. In a world where AI agents will touch your inbox, your CRM and your forecast, picking a model without your own test is now a bet.
Watch it live: firmulate.com/live · Full results: firmulate.com/benchmarks.html
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