The $18 Swap Kit — Run GLM-5.3 Inside the Claude Code You Already Use: the Exact Two-Line Config, My 5-Task Day-One Battery, the Off-Peak Half-Rate Trick, and the Should-You-Switch Checklist

The companion to the video. On August 14, 2026 Z.ai shipped GLM-5.3 — same base model as GLM-5.2, every gain from scaled post-training, and the strongest open-weights coding model on their published table — with no per-token API yet and the open weights held ~2 weeks for safety hardening. The $18/month Coding Plan is the only day-one door, and this kit is everything I verified swapping it into Claude Code the day it dropped. PAGE 2 — THE SWAP: the three steps (Lite plan → API key → the exact ANTHROPIC_BASE_URL / ANTHROPIC_AUTH_TOKEN / ANTHROPIC_MODEL block), the 10-second sanity check, and the two honest heads-ups (the unknown-model context note, and that thinking can no longer be disabled). PAGE 3 — THE RECEIPTS: my 5-task day-one battery, all five passed — the 3-bug fix in 34s, the multi-file TTL feature to a green acceptance suite in 100s, the 21-commit git-bisect regression hunt with the exact commit and root cause in 72s, the 600K-token repo trace with every citation verified, and the one-shot single-file web app in 95s — plus the Opus 5 control runs (same outcomes, ~1.5–2× faster) and the receipt that matters: the whole day used 187 of 10,000 weekly credits. PAGE 4 — THE FIVE PROMPTS VERBATIM so you can rerun the battery on your own repo in under an hour. PAGE 5 — the off-peak half-rate trick (peak is 2–6 AM Eastern, so the entire US workday bills at half rate), the three catches (slower; marathons still favor Opus on z.ai's own table; your code travels to z.ai servers in China — treat NDA work as a wall), and the 60-second should-you-switch checklist with the two dates to watch (open weights ~2 weeks out, per-token API 'coming soon'). Every claim verified against z.ai's announcement and docs plus live runs on my machine, August 14, 2026. Independent kit from Hyperautomation Labs — not affiliated with Z.ai or Anthropic.

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