Claude Code returns blank thinking blocks, but reasoning still costs you
AI and ML
Developers report model thinking blocks being returned empty or truncated
Anthropic's Claude Code appears to be having trouble displaying summaries of its "thinking," according to several bug reports, while the underlying reasoning tokens still cost money. According to complaints, the API has been returning empty thinking blocks for Opus 4.8 and Sonnet 5 even when users explicitly request summarized thinking.
Models from several sources can display their "thinking," a process that gives models additional tokens to reason through complex problems before producing a response. Software with this capability delivers a summary that explains how it tackled a task. Some can also indulge in "extended thinking," though this capability is now deprecated.
Developers often enable "thinking" in the hope that it produces better results, at the cost of additional tokens and latency.
Developer Michael Hood has noticed that some of Anthropic's models are currently...
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