Progression

Apparently, Fable 5 struggled a bit, but was able to complete all problems with a harness.

Source: https://x.com/TarikMoon/status/2077988588801954106?s=20

Solutions: https://github.com/SignalPilot-Labs/AutoFyn/blob/production/results/imo-2026/pdfs/IMO_performance_by_GPT_5_6_sol.pdf