> For example, they seem to not care about instructions to only write a response and no explanation, thus making it impossible to use them in a pipeline
I was doing some local tidying up of recording transcripts, using a fairly long system prompt, and I saw the same behaviour you mention if the transcript I was passing in was too long -- batching it up to make sure to be under the max length prevented this.
Might not be what's happening in your case, but I mention it because it wasn't immediately obvious to me when I first saw the behaviour.
I was doing some local tidying up of recording transcripts, using a fairly long system prompt, and I saw the same behaviour you mention if the transcript I was passing in was too long -- batching it up to make sure to be under the max length prevented this.
Might not be what's happening in your case, but I mention it because it wasn't immediately obvious to me when I first saw the behaviour.