Real gpt-5.4 agentic loop raised per-GPU TP1 0.123 -> TP2 0.2925 -> TP4 1.0012 (8.1x),
each a correctly-diagnosed real gain; then a TP4 runtime tweak measured 0.942 < 1.00
and was correctly rejected (no regression). With the 30B run (validator stop + LLM-stop
veto), all Stop-B behaviors are now validated end-to-end. The SIGTERM-teardown fix was
validated in practice (clean engine teardown, no GPU leak on stop). Efficiency finding:
at scale=1.0, infeasible high-theta probes burn the 900s elapsed cap, so a practical
loop needs a lower cap; this is why the run was stopped after iter-4 rather than driven
to an explicit Stop-B firing.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Gahow Wang
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