To add to this: one of Anthropic's big quality problems this year was claude code began leaving out the reasoning when a chat was idle for X period of time and

To add to this: one of Anthropic's big quality problems this year was claude code began leaving out the reasoning when a chat was idle for X period of time and was revived. They said it was to avoid delay and make it feel better but it was during a huge capacity crunch so probably just something they felt compelled to do. Without the reasoning in the history model performance degraded greatly when the chat continued.