[JamesSwift]

> all major vendors throw out the reasoning tokens between turns

That would be surprising to me. The reasoning _is_ the model intelligence in a lot of respects, and so dropping those from the context would affect its output pretty significantly.

I assume that instead they just have a lot of guardrails in place and multiple runtime environments that an individual turns ping-pong between in order to dehydrate/rehydrate the reasoning to keep it hidden from the end user.

[Roritharr]

Anthropic very explicitly says below their diagrams ( https://platform.claude.com/docs/en/build-with-claude/contex... ) on this:

"Stripping extended thinking: Extended thinking blocks (shown in dark gray) are generated during each turn's output phase, but are not carried forward as input tokens for subsequent turns. You do not need to strip the thinking blocks yourself. The Claude API automatically does this for you if you pass them back."

It's more nuanced in the various modes, but i haven't seen it boil down towards Thinking Tokens surviving more than two turns.

[JamesSwift]

Thats really surprising, I stand corrected. I have had a lot of issues with hallucinations I attributed to adaptive thinking, but I wonder if those were actually due to this behavior instead.

[irthomasthomas]

Yep they store them encrypted https://blog.cryptographyengineering.com/2026/05/29/fooling-...