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Alexander Panfilov

Max Planck Institute for Intelligent Systems

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#artificial intelligence Preprint Sep 2026

Alignment via Training Against Probes Without Losing Monitorability

Models are usually aligned based on their observed outputs, using demonstrations, preference data, or reward signals. These objectives reward responses that look aligned. More capable models may learn to satisfy them without internalizing the intended behavior, for example by faking compliance during training. Such sup...

Lena Libon, Alexander Panfilov, Ben Rank et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Distillation Defenses Easily Break After Reinforcement Learning

It is argued that a more realistic threat model includes further training with reinforcement learning after distillation, and it is shown that simple attacks can steal reasoning capabilities from existing closed-source language models using data easily obtainable from current APIs, yielding reasoning improvements equiv...

Shidan Javaheri, Alexander Panfilov, O. Britton et al. · 0 citations
Preprint Aug 2026

Stealing Reasoning Traces from Proprietary LLM APIs

An architectural vulnerability is identified that circumvents anti-distillation mechanisms, allowing adversaries to extract a proprietary model's reasoning, as well as proposing concrete cryptographic and system-level mitigations to secure client-side reasoning.

Alexander Panfilov, David Schmotz, I. Shumailov et al. · 9 citations · ⚡3

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