Swe-marathon, a new ultra-long-horizon benchmark, shows frontier coding agents solving under 30…
swe-marathon, a new ultra-long-horizon benchmark, shows frontier coding agents solving under 30 percent of tasks where each attempt averages 27 million tokens. the failures are mostly self-inflicted: poor self-verification, premature termination, and agents declaring work infeasible when it is not. the bottleneck stopped being model capability and became knowing when to keep going.
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