Hey, thanks for the report. I see the screenshot with the looping “thought” block, this is a known issue.
The team is aware: Endless thinking loop in Plan Mode subagent
Root cause is a bug in how Opus parses thinking tags. The model can’t exit the <think> block and gets stuck re-checking tasks that are already done. That explains the 3M+ token usage.
Workaround for now: Don’t use Plan mode with Opus 4.5 thinking for the moment. Or try another model (GPT, Gemini). Similar loop bugs can happen there too, but they’re usually not as bad with tokens.
Your request ID will help the team track the specific case.
About Chinese, it’s most likely not related. Other users hit the same thing in English too.