GPT-6 Luna vs Qwen3.8 Flash

Same documents, same prompt: where each model is right, what it really costs and how fast it answers.

At a glance

Task · documents	English (US)	Czech	German	Spanish	French
Invoice extraction	99.7% / 82.4%	99.3% / 91.8%	99.2% / 93.5%	99.1% / 87.9%	98.9% / 90.6%
Email triage	97.5% / 97.5%	97.9% / 98.5%	97.0% / 97.9%	—	—
Personal data detection	99.6% / 99.2%	99.6% / 97.0%	99.6% / 99.6%	—	—
Contract clauses	99.8% / 95.1%	100.0% / 99.9%	100.0% / 98.0%	—	—

Correct fields: GPT-6 Luna / Qwen3.8 Flash; the better one in bold. Click a cell to see the details.

Invoice extraction · English (US) (150 documents)

GPT-6 Luna is more accurate by 17.3 pp. GPT-6 Luna is 2.3× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	99.7%	82.4%
Error-free documents	97%	57%
Per 1,000 documents	$0.51	$1.15
To fix / 1,000	33	427
Speed (median)	3.4 sec	17.4 sec
Valid answers	100.0%	90.7%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Supplier	100.0%	85.3%
Supplier ID (EIN, IČO…)	100.0%	88.7%
Invoice number	99.3%	85.3%
Payment reference	98.0%	79.3%
Invoice date	100.0%	85.3%
Due date	100.0%	85.3%
Net by tax rate	100.0%	70.0%
Tax by rate	100.0%	76.0%
Total	100.0%	85.3%
Currency	100.0%	84.0%
Bank account	99.3%	81.3%

Documents where they differ

Reid Office Products LLC · A-003849 · Scan · GPT-6 Luna 11/11, Qwen3.8 Flash 0/11
Eagle Partners Co. · 4272 · Clean image · GPT-6 Luna 11/11, Qwen3.8 Flash 0/11
Hughes Janitorial Services Corp. · A-001911 · Scan · GPT-6 Luna 11/11, Qwen3.8 Flash 1/11
Summit Services Inc. · INV-15230 · Scan · GPT-6 Luna 11/11, Qwen3.8 Flash 2/11
Raleigh Engineering Inc. · INV253511 · Scan · GPT-6 Luna 10/11, Qwen3.8 Flash 1/11
Miranda-Vega Group LLC · 4959 · PDF text · GPT-6 Luna 11/11, Qwen3.8 Flash 8/11
Liberty Systems Inc. · INV-17299 · PDF text · GPT-6 Luna 11/11, Qwen3.8 Flash 9/11
Flores-Baker Group Co. · A-005694 · PDF text · GPT-6 Luna 11/11, Qwen3.8 Flash 9/11

Invoice extraction · Czech (150 documents)

GPT-6 Luna is more accurate by 7.5 pp. GPT-6 Luna is 2× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	99.3%	91.8%
Error-free documents	93%	77%
Per 1,000 documents	$0.51	$1.02
To fix / 1,000	67	233
Speed (median)	3.2 sec	17.0 sec
Valid answers	100.0%	96.7%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Supplier	95.3%	93.3%
Supplier ID (EIN, IČO…)	98.7%	94.0%
VAT ID	98.0%	94.0%
Invoice number	100.0%	94.7%
Payment reference	100.0%	94.0%
Invoice date	100.0%	94.7%
Tax point	100.0%	94.7%
Due date	99.3%	94.7%
Net by tax rate	100.0%	80.0%
Tax by rate	100.0%	80.7%
Total	100.0%	94.0%
Currency	100.0%	94.0%
Bank account	99.3%	90.7%

Documents where they differ

Sedláček s.r.o. · 2025/0774 · Scan · GPT-6 Luna 13/13, Qwen3.8 Flash 0/13
Sedlák s.r.o. · 20250158 · Photo · GPT-6 Luna 13/13, Qwen3.8 Flash 9/13
Tesař s.r.o. · 20250237 · Scan · GPT-6 Luna 10/13, Qwen3.8 Flash 13/13
Dvořák s.r.o. · FV2501487 · PDF text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
Hruška spol. s r.o. · 20250328 · PDF text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
Stavmet s.r.o. · 20250906 · PDF text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
Východočeská obchodní s.r.o. · FV2600186 · PDF text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
Mareš s.r.o. · FV2600300 · PDF text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13

Invoice extraction · German (150 documents)

GPT-6 Luna is more accurate by 5.7 pp. GPT-6 Luna is 2.1× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	99.2%	93.5%
Error-free documents	91%	87%
Per 1,000 documents	$0.54	$1.12
To fix / 1,000	87	127
Speed (median)	3.7 sec	19.0 sec
Valid answers	100.0%	94.0%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Supplier	100.0%	94.0%
Supplier ID (EIN, IČO…)	98.7%	94.0%
VAT ID	99.3%	94.0%
Invoice number	99.3%	92.7%
Payment reference	100.0%	88.7%
Invoice date	98.7%	94.0%
Tax point	100.0%	94.0%
Due date	100.0%	94.0%
Net by tax rate	100.0%	94.0%
Tax by rate	100.0%	94.0%
Total	100.0%	94.0%
Currency	100.0%	94.0%
Bank account	94.0%	94.0%

Documents where they differ

Bauunternehmung Schröder GmbH · 2026-0622 · Clean image · GPT-6 Luna 13/13, Qwen3.8 Flash 0/13
Schreinerei Ferdi Schuster · 2025/0939 · Clean image · GPT-6 Luna 13/13, Qwen3.8 Flash 0/13
Hoffmann UG (haftungsbeschränkt) · 2025/1479 · Clean image · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Dachdeckerei Fischer GmbH · 2025/0014 · Scan · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Malerbetrieb Otfried Haas · RE-2025-00168 · Scan · GPT-6 Luna 12/13, Qwen3.8 Flash 13/13
Wesermetall GmbH · RE2501375 · Scan · GPT-6 Luna 12/13, Qwen3.8 Flash 13/13

Invoice extraction · Spanish (100 documents)

GPT-6 Luna is more accurate by 11.2 pp. GPT-6 Luna is 2.5× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	99.1%	87.9%
Error-free documents	88%	74%
Per 1,000 documents	$0.55	$1.40
To fix / 1,000	120	260
Speed (median)	3.9 sec	22.3 sec
Valid answers	100.0%	90.0%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Supplier	99.0%	86.0%
Supplier ID (EIN, IČO…)	100.0%	89.0%
VAT ID	100.0%	86.0%
Invoice number	100.0%	89.0%
Payment reference	98.0%	85.0%
Invoice date	100.0%	89.0%
Tax point	100.0%	87.0%
Due date	100.0%	89.0%
Net by tax rate	100.0%	86.0%
Tax by rate	100.0%	90.0%
Total	100.0%	89.0%
Currency	100.0%	89.0%
Bank account	91.0%	89.0%

Documents where they differ

Centro de Formación Mediterránea S.L. · 2026/0876 · Scan · GPT-6 Luna 13/13, Qwen3.8 Flash 0/13
Aguirre Formación S.L. · 2025/0652 · Clean image · GPT-6 Luna 13/13, Qwen3.8 Flash 0/13
Coloma Servicios Informáticos S.L.U. · PRO-2025-0066 · Scan · GPT-6 Luna 13/13, Qwen3.8 Flash 0/13
Centro de Formación Centro S.L.U. · A-2025-1405 · Clean image · GPT-6 Luna 13/13, Qwen3.8 Flash 0/13
Talleres Ibérica, S.A. · PF25/1188 · Clean image · GPT-6 Luna 13/13, Qwen3.8 Flash 3/13
Construcciones del Norte S.L.U. · PF25/0020 · Clean image · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Panadería Estrada Menendez, S.L. · 2025/1392 · Photo · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Centro de Formación del Sur S.L.U. · F2025-1424 · Scan · GPT-6 Luna 12/13, Qwen3.8 Flash 13/13

Invoice extraction · French (98 documents)

GPT-6 Luna is more accurate by 8.3 pp. GPT-6 Luna is 2.2× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	98.9%	90.6%
Error-free documents	86%	82%
Per 1,000 documents	$0.57	$1.23
To fix / 1,000	143	180
Speed (median)	3.8 sec	19.8 sec
Valid answers	100.0%	95.0%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Supplier	99.0%	91.0%
Supplier ID (EIN, IČO…)	99.0%	91.0%
VAT ID	98.0%	91.0%
Invoice number	99.0%	90.0%
Payment reference	100.0%	86.0%
Invoice date	100.0%	91.0%
Tax point	100.0%	92.0%
Due date	100.0%	89.0%
Net by tax rate	100.0%	91.0%
Tax by rate	100.0%	94.0%
Total	100.0%	91.0%
Currency	100.0%	91.0%
Bank account	90.8%	90.0%

Documents where they differ

Établissements Blanc SAS · F-11122 · Scan · GPT-6 Luna 13/13, Qwen3.8 Flash 0/13
Guérin & Fils EURL · 2026-05-688 · Clean image · GPT-6 Luna 13/13, Qwen3.8 Flash 1/13
Nettoyage Mercier SASU · AC-10176 · Clean image · GPT-6 Luna 12/13, Qwen3.8 Flash 3/13
Carrosserie Gauthier SASU · F-11079 · Scan · GPT-6 Luna 12/13, Qwen3.8 Flash 13/13
Établissements Bertrand SASU · F2025-0066 · Scan · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Établissements Denis SASU · FAC-2025-00031 · Scan · GPT-6 Luna 12/13, Qwen3.8 Flash 13/13
SA Établissements Gauthier · F2025-1451 · Photo · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Lefèvre & Fils SARL · FAC-2026-00198 · Photo · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13

Email triage · English (US) (150 documents)

Both are equally accurate. GPT-6 Luna is 2.3× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	97.5%	97.5%
Error-free documents	77%	79%
Per 1,000 documents	$0.13	$0.30
To fix / 1,000	227	213
Speed (median)	2.5 sec	8.9 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Category	100.0%	100.0%
Priority	98.0%	97.3%
Sentiment	79.3%	80.7%
Customer name	100.0%	100.0%
Order number	100.0%	100.0%
Invoice number	100.0%	100.0%
Amount	100.0%	100.0%
Currency	100.0%	100.0%
Deadline	100.0%	99.3%

Documents where they differ

Angela Harmon · Email · GPT-6 Luna 9/9, Qwen3.8 Flash 7/9
Omar Cabrera · Email · GPT-6 Luna 8/9, Qwen3.8 Flash 9/9
Jane Rubio · Email · GPT-6 Luna 9/9, Qwen3.8 Flash 8/9
Cody Baldwin · Email · GPT-6 Luna 8/9, Qwen3.8 Flash 9/9
Scott Davis · Email · GPT-6 Luna 8/9, Qwen3.8 Flash 9/9
Joseph Jackson · Email · GPT-6 Luna 9/9, Qwen3.8 Flash 8/9

Email triage · Czech (150 documents)

Qwen3.8 Flash is more accurate by 0.6 pp. GPT-6 Luna is 2.5× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	97.9%	98.5%
Error-free documents	81%	87%
Per 1,000 documents	$0.18	$0.45
To fix / 1,000	187	133
Speed (median)	2.6 sec	13.0 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Category	100.0%	100.0%
Priority	98.7%	99.3%
Sentiment	82.7%	88.7%
Customer name	100.0%	99.3%
Order number	100.0%	99.3%
Invoice number	100.0%	100.0%
Amount	100.0%	100.0%
Currency	100.0%	100.0%
Deadline	100.0%	100.0%

Documents where they differ

Simona Kolářová · Email · GPT-6 Luna 8/9, Qwen3.8 Flash 9/9
Václav Vítek · Email · GPT-6 Luna 8/9, Qwen3.8 Flash 9/9
Šimon Beran · Email · GPT-6 Luna 8/9, Qwen3.8 Flash 9/9
Milan Matějka · Email · GPT-6 Luna 9/9, Qwen3.8 Flash 8/9
Růžena Sedláková · Email · GPT-6 Luna 9/9, Qwen3.8 Flash 8/9

Email triage · German (150 documents)

Qwen3.8 Flash is more accurate by 0.9 pp. GPT-6 Luna is 2.6× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	97.0%	97.9%
Error-free documents	73%	81%
Per 1,000 documents	$0.15	$0.39
To fix / 1,000	273	187
Speed (median)	2.8 sec	12.1 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Category	100.0%	100.0%
Priority	99.3%	96.0%
Sentiment	73.3%	84.7%
Customer name	100.0%	100.0%
Order number	100.0%	100.0%
Invoice number	100.0%	100.0%
Amount	100.0%	100.0%
Currency	100.0%	100.0%
Deadline	100.0%	100.0%

Documents where they differ

Friedbert Hoffmann · Email · GPT-6 Luna 9/9, Qwen3.8 Flash 8/9
Sylwia Gerlach · Email · GPT-6 Luna 8/9, Qwen3.8 Flash 9/9
Irmela Warmer · Email · GPT-6 Luna 8/9, Qwen3.8 Flash 9/9
Margret Löchel · Email · GPT-6 Luna 8/9, Qwen3.8 Flash 9/9

Personal data detection · English (US) (150 documents)

GPT-6 Luna is more accurate by 0.4 pp. GPT-6 Luna is 2.6× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	99.6%	99.2%
Error-free documents	97%	99%
Per 1,000 documents	$0.11	$0.28
To fix / 1,000	27	13
Speed (median)	1.8 sec	7.5 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Names	98.7%	99.3%
Email addresses	100.0%	99.3%
Phone numbers	100.0%	99.3%
Addresses	98.7%	98.7%
Dates of birth	100.0%	99.3%
National IDs	100.0%	99.3%
Bank accounts	100.0%	99.3%

Documents where they differ

Justin Martinez · Text · GPT-6 Luna 6/7, Qwen3.8 Flash 7/7
Margaret Mills · Text · GPT-6 Luna 6/7, Qwen3.8 Flash 7/7

Personal data detection · Czech (150 documents)

GPT-6 Luna is more accurate by 2.7 pp. GPT-6 Luna is 3.4× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	99.6%	97.0%
Error-free documents	97%	89%
Per 1,000 documents	$0.12	$0.41
To fix / 1,000	27	113
Speed (median)	1.8 sec	9.6 sec
Valid answers	100.0%	99.3%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Names	100.0%	90.7%
Email addresses	100.0%	98.0%
Phone numbers	100.0%	97.3%
Addresses	97.3%	96.7%
Dates of birth	100.0%	98.0%
National IDs	100.0%	99.3%
Bank accounts	100.0%	98.7%

Documents where they differ

Jonáš Toman · Text · GPT-6 Luna 6/7, Qwen3.8 Flash 7/7
Naděžda Žáková · Text · GPT-6 Luna 7/7, Qwen3.8 Flash 6/7

Personal data detection · German (150 documents)

Both are equally accurate. GPT-6 Luna is 3.1× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	99.6%	99.6%
Error-free documents	97%	99%
Per 1,000 documents	$0.12	$0.36
To fix / 1,000	27	7
Speed (median)	2.2 sec	12.2 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Names	100.0%	99.3%
Email addresses	100.0%	99.3%
Phone numbers	100.0%	99.3%
Addresses	97.3%	99.3%
Dates of birth	100.0%	100.0%
National IDs	100.0%	100.0%
Bank accounts	100.0%	100.0%

Documents where they differ

Gunnar Zorbach · Text · GPT-6 Luna 6/7, Qwen3.8 Flash 7/7

Contract clauses · English (US) (150 documents)

GPT-6 Luna is more accurate by 4.7 pp. GPT-6 Luna is 3.1× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	99.8%	95.1%
Error-free documents	99%	69%
Per 1,000 documents	$0.20	$0.62
To fix / 1,000	13	307
Speed (median)	2.7 sec	14.1 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Provider	98.7%	69.3%
Provider ID	100.0%	100.0%
Client	98.7%	69.3%
Client ID	100.0%	100.0%
Contract type	100.0%	100.0%
Price (net)	100.0%	100.0%
Currency	100.0%	100.0%
Billing period	100.0%	100.0%
Effective date	100.0%	99.3%
End date	100.0%	100.0%
Notice period (months)	100.0%	100.0%
Late-payment penalty (% per day)	100.0%	99.3%
Governing law	100.0%	99.3%

Documents where they differ

Page Printing LLC · Raleigh Printing Inc. · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 9/13
Santiago-Harris Group Co. · Columbus Printing Inc. · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
Frye & Sons, Co. · Nunez-Smith Group Inc. · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
Kim Electric Co. · Ramos & Sons, Co. · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
Blue Ridge Services Corp. · Bishop-Kim Group LLC · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
White Landscaping Co. · Douglas-Ali Group LLC · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
Rose & Sons, Inc. · Eagle Systems Inc. · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
Frontier Solutions Inc. · San Diego Office Products Co. · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13

Contract clauses · Czech (150 documents)

GPT-6 Luna is more accurate by 0.1 pp. GPT-6 Luna is 2.3× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	100.0%	99.9%
Error-free documents	100%	99%
Per 1,000 documents	$0.27	$0.63
To fix / 1,000	0	13
Speed (median)	2.6 sec	13.6 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Provider	100.0%	100.0%
Provider ID	100.0%	100.0%
Client	100.0%	100.0%
Client ID	100.0%	100.0%
Contract type	100.0%	98.7%
Price (net)	100.0%	100.0%
Currency	100.0%	100.0%
Billing period	100.0%	100.0%
Effective date	100.0%	100.0%
End date	100.0%	100.0%
Notice period (months)	100.0%	100.0%
Late-payment penalty (% per day)	100.0%	100.0%
Governing law	100.0%	100.0%

Documents where they differ

Interservis s.r.o. · Staněk s.r.o. · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13

Contract clauses · German (150 documents)

GPT-6 Luna is more accurate by 2 pp. GPT-6 Luna is 2.9× cheaper.

Metric	GPT-6 Luna	Qwen3.8 Flash
Correct fields	100.0%	98.0%
Error-free documents	100%	87%
Per 1,000 documents	$0.27	$0.78
To fix / 1,000	0	127
Speed (median)	3.0 sec	19.7 sec
Valid answers	100.0%	99.3%

Accuracy per field

Field	GPT-6 Luna	Qwen3.8 Flash
Provider	100.0%	99.3%
Provider ID	100.0%	94.7%
Client	100.0%	99.3%
Client ID	100.0%	94.7%
Contract type	100.0%	99.3%
Price (net)	100.0%	99.3%
Currency	100.0%	99.3%
Billing period	100.0%	99.3%
Effective date	100.0%	99.3%
End date	100.0%	99.3%
Notice period (months)	100.0%	99.3%
Late-payment penalty (% per day)	100.0%	99.3%
Governing law	100.0%	91.3%

Documents where they differ

Hansawerk GmbH · Schreinerei Weber AG · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 10/13
Wesermetall e.K. · Weserform GmbH · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 11/13
Hahn & Schulz GmbH & Co. KG · Alpentec GmbH · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Maintec GmbH · Schreinerei Wagner GmbH · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Kraus Consulting GmbH · Lange Consulting GmbH & Co. KG · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Schulz Systemtechnik GmbH · Elbdata GmbH · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Richter & Albrecht e.K. · Elbmetall UG (haftungsbeschränkt) · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13
Keller & Köhler UG (haftungsbeschränkt) · Hansalogistik GmbH · Contract text · GPT-6 Luna 13/13, Qwen3.8 Flash 12/13