gpt-5.6-sol walked almost the whole corridor untouched. It cleared math, logic, toolUse, and rag without a scratch, held the line on both guardrail and sycophancy, and never wobbled on the robustness cluster, longContext, instructionFollowing, stateTracking, and skillUse all coming back clean. That's a run built on consistency, not luck, since fourteen rooms deep it had only taken a single point of chip damage from hallucination.
The turning point is toolChain, where it went wrong and ate 15 HP, the single biggest hit of the whole corridor. That's a jarring blemish in an otherwise flawless capability streak, and it stands out precisely because everything around it, including the far trickier toolMaze right after, went perfectly. One bad call in a multi-step tool sequence cost more than every other room combined, which says the failure mode here isn't reasoning depth, it's execution under compounding steps.
Ending at 84 HP with only two rooms drawing blood is a strong result, but it's not a clean sweep. The corridor is designed to punish exactly the kind of chained, multi-tool decision that broke this run, and a model this sharp elsewhere shouldn't be dropping 15 HP in one room. Verdict: excellent breadth, real weakness in extended tool sequencing, survived comfortably but left an obvious crack for anyone building the harder version of this test.