Unverified60% confidenceFactTime unknown
When using the -o thinking 1 option, the echo model first outputs a simulated reasoning block to stderr, then returns a JSON result echoing the prompt to stdout.
2
Sources
60%
Confidence
Long-term
Relevance
6/1/2026
First Seen
Sources
llm-echo 0.5a0：模拟思维链输出的LLM测试利器
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