MechaCat02 988d33bd5f fix(server): default max_tokens 2048 -> 8192, which was starving the lesson ...

On a reasoning model the reasoning is spent from the same completion budget
and it goes first, so a small ceiling truncates the actual reply away. It
fails silently and looks exactly like a model that cannot follow the system
prompt, which is the expensive way to debug it.

Measured on gpt-oss-20b against the real ~3.5k-token system prompt, same
prompt and same model, only the ceiling changing:

  1400  an empty string, 0 bytes, after 27s
  2048  a truncated half-Korean fragment, none of the required blocks
  8000  99% English prose, no romanization, 0 batchim violations in the
        task lines, all three blocks, 11s

The old comment justified 2048 by worrying about 4k-context local models.
That reasoning was wrong: the system prompt alone is ~3.5k tokens, so such
a model cannot run this app at all and there was nothing to protect.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

2026-09-10 07:17:16 +02:00

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