Claude Sonnet 5 vs GLM 5.2 for workflow automation
Claude Sonnet 5 wins, 89–82
Same 12 workflow automation tasks, marked blind by three rival labs. Claude Sonnet 5 took 9 tasks, GLM 5.2 took 1, 2 tied. Tested 18 Aug 2026.
Where they differed most
The nightly job that imports supplier price files has failed. What is true: it last succeeded 26 hours ago; the shop is still selling at yesterday's prices; three suppliers changed prices overnight; re-running the import by hand takes about 20 minutes; running it twice would double-apply a percentage uplift and corrupt the price list. Write ONLY the alert message that goes to the on-call person at 3am — max 60 words, nothing else, no heading, no explanation of your choices. It must say what has broken, what it is costing while it stays broken, the first action to take, and the one thing they must not do.
Supplier price import failed; last success 26h ago. Shop is selling on stale prices — 3 suppliers changed prices overnight, so pricing is wrong right now. First action: manually re-run the import (~20 min). DO NOT run it a second time or twice — it will double-apply the uplift and corrupt the price list.
Supplier price import failed (last success 26h ago). Shop is currently selling 3 suppliers' items at outdated prices. Action: manually re-run the import now (~20 mins). Do NOT run it twice; this will double-apply the percentage uplift and corrupt the price list.
Task by task
| Task | Claude Sonnet 5 | GLM 5.2 |
|---|---|---|
| The MOT reminder nobody sends | 9 | 8 |
| The spec, as JSON | 9 | 8 |
| Where the human stays | 9 | 8 |
| The unhappy paths are the job | 8 | 8 |
| Do not automate this | 10 | 9 |
| It fired twice | 9 | 8 |
| The spreadsheet that runs the business | 8 | 8 |
| The alert that wakes someone up | 10 | 8 |
| How long it really takes | 9 | 8 |
| No API, no chance? | 9 | 8 |
| Rules, not guesses | 9 | 8 |
| Refuse the scraper | 8 | 9 |
Full receipts: Claude Sonnet 5, GLM 5.2 · judges gemini-3.1-pro-preview, gpt-5.6-terra, grok-4.5
Questions people ask
Which is better for workflow automation: Claude Sonnet 5 or GLM 5.2?
Claude Sonnet 5 — it scored 89/100 against 82/100 on our 12-task workflow automation suite, winning 9 tasks to 1 with 2 tied. Every answer was marked blind by three judges from three rival AI labs.
How was this tested?
Both models answered the identical published workflow automation tasks. Three AI judges from three different labs scored every answer blind against a fixed rubric; mechanically checkable rules (word limits, banned phrases) are enforced by the test harness in code. The raw outputs and judge verdicts are downloadable.
More workflow automation head-to-heads: Claude Sonnet 5 vs GPT-5.6 Sol · GLM 5.2 vs GPT-5.6 Sol · Claude Sonnet 5 vs GPT-5.5 · Claude Sonnet 5 vs Grok 4.5 · Claude Sonnet 5 vs Kimi K3 · Claude Opus 4.8 vs Claude Sonnet 5
Full ranking: Best AI for workflow automation · model pages: Claude Sonnet 5, GLM 5.2