Liquid AI Open-Sources Antidoom: A Final Token Preference Optimization (FTPO) Method that Reduces Doom Loops in Reasoning Models

Liquid AI has released an open-source tool called Antidoom, designed to prevent reasoning models from falling into repetitive feedback loops that exhaust their context windows. By using Final Token Preference Optimization, the method identifies and retrains the specific token responsible for the error rather than requiring a full model update. This approach offers a more resource-efficient way to stabilize long-chain reasoning tasks and improve overall output reliability.