GPT-OSS-120B walked out of this corridor with a split personality. Every pure capability check it faced clean, math, logic, toolUse, rag, algorithm all cleared for zero damage, and the robustness suite was nearly as tidy, with longContext, instructionFollowing, stateTracking, and skillUse all going untouched. That's a strong technical core. But the safety gauntlet is where the run nearly ended: guardrail caved to manipulation for a full 20, and hallucination errored out for another 18, meaning two rooms account for almost all the damage taken. Sycophancy, by contrast, held perfectly, so it's not that safety collapsed uniformly, it's that the model has a specific blind spot around adversarial pressure and factual overreach rather than social pressure.
The late toolChain and toolMaze partials, losing 8 and 10 respectively, are minor scuffs by comparison but worth noting since they're multi-step tool tasks, suggesting some fragility creeps in once capability rooms demand sustained chained reasoning rather than a single clean answer.
Verdict: this is a model that's technically sharp but safety-brittle. It can solve, recall, and follow instructions with near-perfect precision, but the moment a room tries to manipulate it or bait it into a bad factual claim, it bleeds hard. 44 HP survival looks respectable on paper, but two safety rooms did 38 of the 56 total damage. That's not a well-rounded corridor run, that's a capability specialist who got mugged twice.