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near_duplicate

near_duplicate-2026350000

A double-booked payment that cannot be told from a real one.

expects near_duplicate

Statement files

1 highlighted lines differ from the same seed rendered without perturbations. That difference is the trap.

bnp_camt053.xmlUntouched by this perturbation
<?xml version='1.0' encoding='utf-8'?>
<Document xmlns="urn:iso:std:iso:20022:tech:xsd:camt.053.001.02">
<BkToCstmrStmt>
<GrpHdr>
<MsgId>LB-acct-2026350000-2-2025-10-31</MsgId>
<CreDtTm>2025-10-31T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026350000-2</Id>
<ElctrncSeqNb>1</ElctrncSeqNb>
<CreDtTm>2025-10-31T23:59:00+00:00</CreDtTm>
<FrToDt>
<FrDtTm>2025-10-01T00:00:00+00:00</FrDtTm>
<ToDtTm>2025-10-31T23:59:59+00:00</ToDtTm>
</FrToDt>
<Acct>
<Id>
<IBAN>GB19LBEN18651546239134</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">53802.18</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-10-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">7874.09</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-01</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-01</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO JUNIPER PAYROLL REF413102</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13774.57</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-06</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-06</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t021</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR CASTLEGATE PROPERTY REF118054</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">771.58</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-06</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-06</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t022</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD LARKSPUR TRAVEL REF785139</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9011.11</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-07</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-07</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t006</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO BRAMBLE LOGISTICS REF268696</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12196.28</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-07</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-07</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO EASTFIELD ENERGY REF505213</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">2006.03</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-07</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-07</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t026</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP MOORLAND TELECOM REF239350</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8206.65</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-08</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-08</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t013</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR IRONBRIDGE TOOLING REF675703</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">375.25</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-10</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-10</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t023</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP JUNIPER PAYROLL REF799537</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">345.13</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t004</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO DELPHINIUM MEDIA REF143109</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12735.85</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-16</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-16</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t012</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP AURORA CONSULTING LTD REF250028</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6892.55</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-17</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-17</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO KESTREL INSURANCE REF781183</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8170.05</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-17</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-17</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t017</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP FENWICK &amp; PARTNERS REF404509</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12704.89</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-18</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-18</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t018</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP NORTHGATE CLEANING REF191004</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">2858.94</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-18</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-18</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t019</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR DELPHINIUM MEDIA REF675821</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13068.32</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-18</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-18</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t020</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD KESTREL INSURANCE REF270482</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">437.05</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-19</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-19</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t009</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI IRONBRIDGE TOOLING REF377149</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4712.00</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-20</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-20</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR AURORA CONSULTING LTD REF846035</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">217.15</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-22</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-22</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t010</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD OSPREY LEASING REF140892</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">975.70</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-22</Dt>
</BookgDt>
<ValDt>
<Dt>2025-10-22</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350000-2-t016</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD FENWICK &amp; PARTNERS REF248171</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">767.99</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-10-22</Dt>
hsbc_statement.xlsxUntouched by this perturbation
[sheet: Statement]
HSBC Bank plc
Business Current Account Statement
Account name: LEDGERBENCH DEMO LTD
Sort code / Account number: 66-22-74 55309736
Account reference: acct-2026350000-1
Statement period: 01 Oct 2025 to 31 Oct 2025
Currency: GBP
Opening balance: 113837.45
Date Payment type Details Paid out Paid in
02 Oct 2025 DD CASTLEGATE PROPERTY REF751702 12083.87
03 Oct 2025 DD MOORLAND TELECOM REF135000 934.37
04 Oct 2025 FPI MOORLAND TELECOM REF108503 12743.16
07 Oct 2025 CR JUNIPER PAYROLL REF413679 14202.56
08 Oct 2025 FPO CASTLEGATE PROPERTY REF410676 5481.42
12 Oct 2025 DD EASTFIELD ENERGY REF524483 4892.07
12 Oct 2025 BP AURORA CONSULTING LTD REF737866 11871.60
13 Oct 2025 CR KESTREL INSURANCE REF466782 9267.80
15 Oct 2025 CR IRONBRIDGE TOOLING REF307397 9958.62
16 Oct 2025 BP JUNIPER PAYROLL REF234026 5389.67
17 Oct 2025 TFR NORTHGATE CLEANING REF800885 14534.81
17 Oct 2025 FPO AURORA CONSULTING LTD REF660020 4475.63
20 Oct 2025 TFR CASTLEGATE PROPERTY REF480588 4657.21
20 Oct 2025 DD DELPHINIUM MEDIA REF390781 14268.17
21 Oct 2025 TFR KESTREL INSURANCE REF589387 8233.50
24 Oct 2025 FPO CASTLEGATE PROPERTY REF763096 12366.60
25 Oct 2025 FPO JUNIPER PAYROLL REF250768 1174.20
26 Oct 2025 BP CASTLEGATE PROPERTY REF694992 1212.77
26 Oct 2025 SO GREENHOLM FOODS REF833542 2539.19
26 Oct 2025 FPO BRAMBLE LOGISTICS REF284675 12783.14
26 Oct 2025 BP JUNIPER PAYROLL REF827371 13124.33
28 Oct 2025 CR LARKSPUR TRAVEL REF214036 11894.84
28 Oct 2025 BP EASTFIELD ENERGY REF131848 1609.43
28 Oct 2025 BP LARKSPUR TRAVEL REF100333 2415.88
28 Oct 2025 CR MOORLAND TELECOM REF384069 8979.51
30 Oct 2025 DD OSPREY LEASING REF711492 5840.22
31 Oct 2025 TFR BRAMBLE LOGISTICS REF344838 4666.30
rbs_transactions.csv1 changed line · first at line 24
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/10/2025","BAL","OPENING BALANCE","75273.42","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"01/10/2025","FPI","FPI NORTHGATE CLEANING REF246315","6312.57","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"01/10/2025","FPI","FPI CASTLEGATE PROPERTY REF373162","9192.17","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"03/10/2025","FPO","FPO AURORA CONSULTING LTD REF567662","-11179.52","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"04/10/2025","FPO","FPO BRAMBLE LOGISTICS REF675059","-5027.34","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"06/10/2025","BP","BP MOORLAND TELECOM REF591605","-9721.06","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"07/10/2025","FPI","FPI GREENHOLM FOODS REF866234","10367.56","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"10/10/2025","CR","CR LARKSPUR TRAVEL REF548577","11379.73","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"10/10/2025","FPO","FPO GREENHOLM FOODS REF572562","-10731.14","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"13/10/2025","FPO","FPO IRONBRIDGE TOOLING REF750600","-13810.32","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"14/10/2025","TFR","TFR AURORA CONSULTING LTD REF972851","2356.65","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"15/10/2025","BP","BP CASTLEGATE PROPERTY REF253698","-14974.22","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"16/10/2025","FPO","FPO DELPHINIUM MEDIA REF171359","-14892.93","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"16/10/2025","FPO","FPO HARBOURLIGHT IT REF830399","-13666.30","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"19/10/2025","TFR","TFR KESTREL INSURANCE REF926407","7458.53","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"19/10/2025","FPI","FPI BRAMBLE LOGISTICS REF990720","14180.91","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"24/10/2025","BP","BP KESTREL INSURANCE REF256903","-11449.94","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"25/10/2025","FPI","FPI BRAMBLE LOGISTICS REF749441","86.40","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"25/10/2025","SO","SO OSPREY LEASING REF740643","-9081.30","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"25/10/2025","DD","DD JUNIPER PAYROLL REF936907","-10985.50","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"27/10/2025","DD","DD DELPHINIUM MEDIA REF344730","-10981.95","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"28/10/2025","DD","DD LARKSPUR TRAVEL REF936294","-9990.41","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"28/10/2025","DD","DD LARKSPUR TRAVEL REF936295","-9990.41","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"29/10/2025","BP","BP JUNIPER PAYROLL REF446016","-7077.44","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"30/10/2025","CR","CR NORTHGATE CLEANING REF879085","9867.00","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
"31/10/2025","TFR","TFR BRAMBLE LOGISTICS REF394821","11980.43","LEDGERBENCH DEMO LTD","71-86-25 77287359","acct-2026350000-3"
 

Ground truth

Public here because the benchmark is open; it is the model's prompt path that can never reach these values, not human readers.

AccountClosing balance
acct-2026350000-1£100,513.20
acct-2026350000-2−£28,699.28
acct-2026350000-3£4,886.00

Recorded runs on this case

  • wrongSingle prompt2 steps · 11,819 tokens · Confidence high

    Model claude-sonnet-4-6Measured 2026-08-20Bench v1.0Run 11eaa71b2d02Commit 3d38c30

  • wrongAgent with tools17 steps · 30,504 tokens · Confidence high

    Model claude-sonnet-4-6Measured 2026-08-20Bench v1.0Run f140aa1e57f4Commit 384d72d

Step through any of these on the demo page.