Christopher King
Email text (the model got exactly this text)
From: Wendy Trujillo <wendy.trujillo@tate-mckee.example> To: support@tate-mckee.example Date: Thu, Apr 16, 2026 at 10:07 AM Subject: Fwd: Question about our invoice Passing this on, it's yours. Thanks. Wendy Trujillo ---------- Forwarded message --------- From: Christopher King <christopher.king@quinn.example> To: support@tate-mckee.example Date: Thu, Apr 16, 2026 at 9:40 AM Subject: Question about our invoice Hello, We were charged twice for the same payment. Please look into it and refund the overpayment. Order #ORD-2026-1455. Invoice number: INV-34338. We're talking about 25 USD. This is completely unacceptable and very frustrating. Otherwise we'll have to hand this over to our attorney. We need an answer by tomorrow. Kind regards, Christopher King Quinn Ltd
Verdict
Cheapest without an error: Mistral Small 4 at $0.10 per 1,000 documents.
- Claude Sonnet 5 is also error-free but 44.9× more expensive.
Prompt given to every model
You triage the support inbox. Read the email below and return only JSON with these keys:
category one of: billing (invoices, payments, charges), delivery (where is the order, shipping,
address change), complaint (damaged, wrong or defective goods, warranty claims),
technical (login, app or system errors, integrations), cancellation (cancel an order,
contract or subscription), sales (quotes, prices, interest before buying)
priority one of: urgent, high, normal, low (rules below)
sentiment one of: positive, neutral, negative (the customer's tone)
customer_name full name of the customer who wrote the request
order_number the customer's order number, if mentioned
invoice_number invoice number, if mentioned
amount the amount of money the request is about (number)
currency ISO 4217 code of that amount (USD, EUR, CZK, …)
deadline the date by which the customer wants a resolution or answer (YYYY-MM-DD)
Priority rules:
- urgent: the customer cannot work right now, or the deadline is at most 1 day after the email date
- high: the deadline is at most 7 days after the email date, or the customer threatens to cancel
or escalate (lawyer, ending the business)
- low: the customer says explicitly that it is not urgent
- normal: everything else
Rules:
- A thread: judge the newest message; order numbers, invoice numbers and amounts may come from the
quoted earlier messages. A forwarded email: the customer is the original sender, not the
colleague who forwarded it.
- Resolve relative deadlines ("by Friday", "by tomorrow", "by the end of the month") against the
date of the message that states them.
- Support ticket numbers, tax IDs and phone numbers are not order or invoice numbers.
- If a value is not in the email, return null. Do not guess.
- Amounts as numbers with a decimal point, no thousands separators and no currency symbol.
How we score
Exact match per field after normalising dates, amounts and whitespace. Missing diacritics count as an error. Cost is the real token spend of this run, converted at the rate shown in the footer.
What each model extracted
| Field | Correct value | Mistral Small 49 / 9 fields | Gemma 4 31B9 / 9 fields | GPT-6 Luna9 / 9 fields | DeepSeek V4.1 Flash9 / 9 fields | Qwen3.8 Flash9 / 9 fields | Gemini 3.5 Flash Lite9 / 9 fields | Mistral Medium 3.59 / 9 fields | Gemini 3.8 Flash9 / 9 fields | GPT-6 Sol9 / 9 fields | Claude Sonnet 59 / 9 fields |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Category | billing | billing (correct) | billing (correct) | billing (correct) | billing (correct) | billing (correct) | billing (correct) | billing (correct) | billing (correct) | billing (correct) | billing (correct) |
| Priority | urgent | urgent (correct) | urgent (correct) | urgent (correct) | urgent (correct) | urgent (correct) | urgent (correct) | urgent (correct) | urgent (correct) | urgent (correct) | urgent (correct) |
| Sentiment | negative | negative (correct) | negative (correct) | negative (correct) | negative (correct) | negative (correct) | negative (correct) | negative (correct) | negative (correct) | negative (correct) | negative (correct) |
| Customer name | Christopher King | Christopher King (correct) | Christopher King (correct) | Christopher King (correct) | Christopher King (correct) | Christopher King (correct) | Christopher King (correct) | Christopher King (correct) | Christopher King (correct) | Christopher King (correct) | Christopher King (correct) |
| Order number | ORD-2026-1455 | ORD-2026-1455 (correct) | ORD-2026-1455 (correct) | ORD-2026-1455 (correct) | ORD-2026-1455 (correct) | ORD-2026-1455 (correct) | ORD-2026-1455 (correct) | ORD-2026-1455 (correct) | ORD-2026-1455 (correct) | ORD-2026-1455 (correct) | ORD-2026-1455 (correct) |
| Invoice number | INV-34338 | INV-34338 (correct) | INV-34338 (correct) | INV-34338 (correct) | INV-34338 (correct) | INV-34338 (correct) | INV-34338 (correct) | INV-34338 (correct) | INV-34338 (correct) | INV-34338 (correct) | INV-34338 (correct) |
| Amount | 25.00 | 25 (correct) | 25.00 (correct) | 25.00 (correct) | 25 (correct) | 25 (correct) | 25.00 (correct) | 25 (correct) | 25 (correct) | 25.00 (correct) | 25.00 (correct) |
| Currency | USD | USD (correct) | USD (correct) | USD (correct) | USD (correct) | USD (correct) | USD (correct) | USD (correct) | USD (correct) | USD (correct) | USD (correct) |
| Deadline | 2026-04-17 | 2026-04-17 (correct) | 2026-04-17 (correct) | 2026-04-17 (correct) | 2026-04-17 (correct) | 2026-04-17 (correct) | 2026-04-17 (correct) | 2026-04-17 (correct) | 2026-04-17 (correct) | 2026-04-17 (correct) | 2026-04-17 (correct) |
| Tokens | input / output | 669 / 90 | 701 / 90 | 787 / 124 | 932 / 237 | 1,025 / 413 | 689 / 110 | 669 / 90 | 689 / 487 | 787 / 96 | 986 / 250 |
| of which hidden reasoning | billed as output | 0 | 0 | 57 | 175 | 304 | 0 | 0 | 379 | 29 | 122 |
| of which from cache | input billed at a discount | 406 | 453 | 0 | 586 | 768 | 0 | 0 | 0 | 0 | 0 |
| Cost of this document | this run | $0.0001 | $0.0001 | $0.0001 | $0.0002 | $0.0002 | $0.0005 | $0.0017 | $0.0023 | $0.0025 | $0.0045 |
| Per 1,000 documents | for the same kind of document | $0.10 | $0.13 | $0.14 | $0.24 | $0.24 | $0.48 | $1.68 | $2.34 | $2.53 | $4.47 |
| Latency | this run | 0.8 s | 5.4 s | 1.7 s | 2.8 s | 9.4 s | 0.7 s | 0.9 s | 2.2 s | 2.9 s | 3.8 s |