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Security2026-08-11 · source-backed
arXiv 2608.09867, from a team including Ilia Shumailov, Jonas Geiping, and Maksym Andriushchenko, found the encrypted reasoning blocks Anthropic, OpenAI, and Google return via API are fully interchangeable across sessions, users, and models within each provider's ecosystem. Inject a trace from a capable model into a weaker, less-safeguarded variant, and it decodes to plaintext. They scraped the blocks from public GitHub repos. If you've ever committed a raw API response containing an encrypted reasoning block, you've leaked the chain of thought and whatever was in it.
Each link below shares sources, entities, or timing with this story.
Meta partners with Google / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Meta partners with Google); both cover Anthropic, GitHub, Google, OpenAI; overlapping topics (anthropic, credential).
Linked by a graph relationship (Meta partners with Google); both cover Anthropic, GitHub, Google, OpenAI; overlapping topics (anthropic, block).
Linked by a graph relationship (Meta partners with Google); both cover Anthropic, GitHub, Google, OpenAI; overlapping topics (anthropic, model).
Google partners with IBM / Shared entities / Earlier coverage / Tension
Linked by a graph relationship (Google partners with IBM); both cover Anthropic, GitHub, Google, OpenAI; earlier Anthropic coverage from 2026-06-27.
OpenAI partners with Google / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (OpenAI partners with Google); both cover Anthropic, Google, OpenAI; overlapping topics (anthropic, model).
Linked by a graph relationship (OpenAI partners with Google); both cover Anthropic, Google, OpenAI; overlapping topics (anthropic, chain).
Linked by a graph relationship (OpenAI partners with Google); both cover Anthropic, Google, OpenAI; overlapping topics (anthropic, model).
OpenAI partners with Google / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (OpenAI partners with Google); both cover Anthropic, GitHub, OpenAI; overlapping topics (anthropic, artifact, model).