GLM-5.3-flash on ollama-cloud with reasoning_effort=high can spend the ENTIRE
output cap on reasoning delivered in a separate field and return
finish_reason=length with no visible content (verified live: max_tokens=4096,
completion_tokens=4096, content empty).
The length-continuation path handled that shape badly:
1. the empty response was appended as an interim assistant fragment,
poisoning the transcript until the pre-call sanitizer healed it
(observed 3+ healings per turn on the reporting user's session);
2. every continuation re-ran with thinking ON, re-deriving the whole
thinking budget against a growing context, so 4 attempts still produced
nothing and the turn died with 'Response remains truncated after 4
continuation attempts'.
Now:
- interim assistant fragments with no visible content are never appended
(whichever way they got empty);
- a thinking-only truncation sets a one-shot reasoning-off override that
build_api_kwargs consumes for the next request, so the continuation
writes the answer instead of re-thinking it;
- the ceiling exit clears a pending override and, when every fragment was
empty, returns an actionable final_response instead of an invisible None.
AlexGabbia
fb76fb0526