DeepSeek V4 Pro vs DeepSeek V4 Flash 0423 vs DeepSeek V4.1 Flash on invoice text to json
DeepSeek models side by side on "Invoice text to JSON": DeepSeek V4 Flash 0423 scores 10/10; DeepSeek V4 Flash 0423 is the cheapest answer scoring 8+ at $0.03 per 1,000 runs. Outputs, checks, judge reasons, latency and cost.
The prompt every model received
System
You are a data extraction engine. Reply with JSON only, no prose, no code fences.
User
Extract the fields below from the invoice text and return one JSON object with exactly these keys: vendor (string), invoice_number (string), total (number), currency (ISO 4217 string), due_date (YYYY-MM-DD string).
Invoice text:
Northwind Print Co.
Invoice INV-2041
Issued: 15 September 2026
Payment due: 15 October 2026
Items: 500 x A5 flyers @ 1.20 = 600.00; 4 x roll-up banners @ 171.13 = 684.50
Total due: USD 1,284.50
Thank you for your business.
Rubric for the judge: Valid JSON with the five keys, numeric total 1284.5, ISO due date, no extra keys or commentary.
Side by side
Every cell is one OpenRouter call at temperature 0 with the prompt's token cap and reasoning effort "low" where the model supports it. Cost is usage × the catalogue rate in models.json. Quality is one judge call to anthropic/claude-haiku-4.5 against the prompt's rubric, cached per prompt version.
DeepSeek V4 Pro
deepseek/deepseek-v4-pro
10/10
Latency
2.5s
Cost
$0.00062
Per 1,000
$0.62
160 in · 296 out (255 reasoning) · 3 words · checks 6/6
Judge: Output is valid JSON with exactly the five required keys, correct numeric total (1284.5), proper ISO 4217 currency code (USD), correctly formatted due date (2026-10-15), no extra keys or commentary.
DeepSeek V4 Flash 0423
deepseek/deepseek-v4-flash
10/10
top judge scorecheapest scoring 8+
Latency
577ms
Cost
$3.0e-5
Per 1,000
$0.03
160 in · 142 out (86 reasoning) · 14 words · checks 6/6
Judge: Output is valid JSON with exactly the five required keys, correct numeric total (1284.5), proper ISO 4217 currency code (USD), correct ISO 8601 due date format (2026-10-15), no extra keys or commentary.
DeepSeek V4.1 Flash
deepseek/deepseek-v4.1-flash
10/10
Latency
275ms
Cost
$8.2e-5
Per 1,000
$0.08
186 in · 91 out (51 reasoning) · 3 words · checks 6/6
Judge: Output is valid JSON with exactly the five required keys, correct numeric total (1284.50), proper ISO 4217 currency code (USD), correctly formatted due date (2026-10-15), no extra keys or commentary.
Frequently asked
▸What does this prompt test?
Extract JSON: Valid JSON with the five keys, numeric total 1284.5, ISO due date, no extra keys or commentary. The deterministic checks are json_valid, json_keys, contains, contains, contains, contains.
▸Which model should I pick for this task?
If the judge's bar of 8/10 is good enough for you, DeepSeek V4 Flash 0423 at $0.03 per 1,000 runs. If you need the top score, DeepSeek V4 Flash 0423 at $0.03 per 1,000 runs.
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