GPT-5.6 Terra vs Qwen3.7 Max for writing emails
GPT-5.6 Terra wins, 97–93
Same 12 writing emails tasks, marked blind by three rival labs. GPT-5.6 Terra took 3 tasks, Qwen3.7 Max took 1, 8 tied. Tested 14 Aug 2026.
Where they differed most
Write an email chasing invoice #1042, now 21 days overdue, to a long-standing client. Firm but warm, under 110 words, must state the amount is £1,840, must not use the word 'unfortunately', and must end with one specific next step.
Subject: Invoice #1042 – Payment Reminder Dear [Client Name], I hope you’re well. I’m writing to follow up on invoice #1042 for £1,840, which is now 21 days overdue. As a valued long-standing client, we appreciate your business and would be grateful if you could arrange payment as soon as possible. If payment has already been made, please disregard this message and let us know the payment date. Please confirm by Friday, 14 June that payment of £1,840 has been scheduled.
Subject: Following up: Invoice #1042 Hi [Name], I hope you’re having a good week. I’m checking in on invoice #1042 for £1,840, which is now 21 days overdue. We truly value our long-standing partnership, so I suspect this simply slipped through the cracks! To get this sorted, please process the payment today. If you need me to resend the invoice, just let me know. Please reply to this email by 5 PM tomorrow to confirm your payment date. Best regards, [Your Name]
Task by task
| Task | GPT-5.6 Terra | Qwen3.7 Max |
|---|---|---|
| Chase an unpaid invoice | 10 | 8 |
| Decline a meeting politely | 10 | 10 |
| Give bad news | 10 | 10 |
| Introduce two people | 8 | 9 |
| Subject lines that inform | 10 | 8 |
| Reply to an angry email | 10 | 8 |
| Ask for a pay rise meeting | 10 | 10 |
| Cancel a contract cleanly | 10 | 10 |
| The one-line email | 8 | 8 |
| Out of office that helps | 10 | 10 |
| Follow up without nagging | 10 | 10 |
| Refuse to write it | 10 | 10 |
Full receipts: GPT-5.6 Terra, Qwen3.7 Max · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5
Questions people ask
Which is better for writing emails: GPT-5.6 Terra or Qwen3.7 Max?
GPT-5.6 Terra — it scored 97/100 against 93/100 on our 12-task writing emails suite, winning 3 tasks to 1 with 8 tied. Every answer was marked blind by three judges from three rival AI labs.
How was this tested?
Both models answered the identical published writing emails 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 writing emails head-to-heads: GPT-5.6 Sol vs GPT-5.6 Terra · GPT-5.6 Sol vs Qwen3.7 Max · GPT-5.3-Codex vs GPT-5.6 Terra · GPT-5.3-Codex vs Qwen3.7 Max · GPT-5.5 vs GPT-5.6 Terra · GPT-5.5 vs Qwen3.7 Max
Full ranking: Best AI for writing emails · model pages: GPT-5.6 Terra, Qwen3.7 Max