May be I'm too old school, but imho if you need to call an LLM to write a commit message you're not committed enough! I think commits ought to be granular and cohesive enough that you can describe in a line or two. And taking time to summarize what you've done is only gonna help you in the future.
WDYT?
It allows me to commit rapidly while I'm working without losing my train of thought, making for embarrassingly more utile commits.
I'm not sure how summarizing things myself (and presumably, remembering) would help me in the future. And besides, it's what the commit message is for.