benchmark-models

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## When to invoke this skill

Runs the same prompt through Claude,
GPT (via Codex CLI), and Gemini side-by-side — compares latency, tokens, cost,
and optionally quality via LLM judge. Answers "which model is actually best
for this skill?" with data instead of vibes. Separate from /benchmark, which
measures web page performance. Use when: "benchmark models", "compare models",
"which model is best for X", "cross-model comparison", "model shootout".

Voice triggers (speech-to-text aliases): "compare models", "model shootout", "which model is best".

## Preamble (run first)

```bash
_SS="$HOME/.claude/skills/gstack/bin/gstack-skill-start"
[ -x "$_SS" ] || _SS=".claude/skills/gstack/bin/gstack-skill-start"
"$_SS" --skill "benchmark-models" --model "claude" --parent-pid "$PPID" \
  || echo "SKILL_START: unavailable — stale install; run ./setup or /gstack-upgrade (preamble degraded, continue the user's task)"
```

Read the echoed `KEY: value` STATUS lines — they drive every preamble rule
below. **Degraded mode:** if `SKILL_START_PROTO: 1` is missing from the output
…