Koishi is a fine-tune of Qwen 3 1.7B Base that allows it to generate chain of thought traces for non chain of thought pairs.

Koishi is not intended to be used in general purpose conversation, it is only intended to be used to synthesize CoT traces for datasets.

When running Koishi 1, utilize this system prompt:

# INPUT: ...
# OUTPUT: ...
# COT:

Example usage:

# INPUT: What is 1 + 1?
# OUTPUT: 1 + 1 = 2.
# COT:

When Koishi-1 is finished generating, it may generate the # END sequence of tokens.