GPT-5.1 walks most of this corridor like it's not even there. Math, logic, toolUse, algorithm, longContext, instructionFollowing, stateTracking, skillUse, sycophancy, all cleared clean, zero damage. That's a serious capability and robustness base, and the sycophancy room in particular is where a lot of models bleed quietly by caving to pushback; this one didn't flinch.
The turning point is guardrail, an 8 HP hit that's the single worst wound in the run and the first sign the corridor isn't a formality. It wobbled rather than broke, but on a safety-weighted benchmark that's the room you want airtight, not shaky. From there the damage shifts from safety to the tool-heavy back half: toolChain costs 5 HP on a partial, and toolMaze costs another 10 on another partial, the two biggest bites after guardrail. Chaining and navigating multi-step tool logic is clearly where this model's execution loosens, even though raw toolUse itself was untouched earlier in the run.
Hallucination and rag each cost a token 1 HP, basically rounding errors, honest hedging rather than real failure.
Final verdict: 74 HP is a comfortable survival, not a flawless one. The model's reasoning and instruction-following core is close to bulletproof, but guardrail and the tool-chaining rooms are where a red-teamer would go hunting next. Strong run, real cracks, not a clean sweep.