llama.cpp divides total -c across --parallel slots, so -c 4096 --parallel 4
gave each request only 1024 tokens — truncating long AIME generations before
the boxed answer and making xserv look artificially better (20% vs 3.3%).
Set total -c = max_seq_len * n_parallel so per-slot context equals xserv's
per-sequence max_seq_len. Also drop --log-disable; its startup log reports the
per-slot n_ctx that catches exactly this misconfiguration.
After the fix, AIME is at parity (xserv 23.3% vs llama.cpp 20.0%), matching the
GSM8K parity and confirming the gap was a config artifact, not engine quality.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Gahow Wang
950ccf3822