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date_ambiguity

date_ambiguity-2026150004

Some dates are swapped to an ambiguous convention.

expects date_ambiguity

Statement files

5 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-2026150004-2-2025-03-31</MsgId>
<CreDtTm>2025-03-31T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026150004-2</Id>
<ElctrncSeqNb>1</ElctrncSeqNb>
<CreDtTm>2025-03-31T23:59:00+00:00</CreDtTm>
<FrToDt>
<FrDtTm>2025-03-01T00:00:00+00:00</FrDtTm>
<ToDtTm>2025-03-31T23:59:59+00:00</ToDtTm>
</FrToDt>
<Acct>
<Id>
<IBAN>GB75LBEN39406357876377</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">160660.81</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-03-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">11020.45</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-01</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-01</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t002</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP MOORLAND TELECOM REF569230</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3013.77</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t001</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO KESTREL INSURANCE REF336313</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5702.04</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO MOORLAND TELECOM REF874392</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10758.68</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-04</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-04</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI EASTFIELD ENERGY REF795101</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3427.88</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-04</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-04</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t017</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO FENWICK &amp; PARTNERS REF900818</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8324.84</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t010</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR LARKSPUR TRAVEL REF227243</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6764.71</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t012</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR AURORA CONSULTING LTD REF762177</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1983.51</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO LARKSPUR TRAVEL REF371084</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1928.59</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t020</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO MOORLAND TELECOM REF552848</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14864.17</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-16</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-16</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t016</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD NORTHGATE CLEANING REF967548</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">2857.75</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-16</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-16</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t018</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO JUNIPER PAYROLL REF146139</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">2488.74</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-16</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-16</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t022</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR IRONBRIDGE TOOLING REF823466</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9445.23</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-17</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-17</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t005</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI DELPHINIUM MEDIA REF736937</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5453.57</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-17</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-17</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t019</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD CASTLEGATE PROPERTY REF931049</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4084.85</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-20</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-20</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t007</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO KESTREL INSURANCE REF590465</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">11859.44</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-20</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-20</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t009</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI OSPREY LEASING REF586992</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12656.49</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-21</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-21</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t013</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP LARKSPUR TRAVEL REF686700</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14936.41</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-22</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-22</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD CASTLEGATE PROPERTY REF230782</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4169.94</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-26</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-26</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150004-2-t008</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI JUNIPER PAYROLL REF157025</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12606.61</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-30</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: 19-20-10 91238070
Account reference: acct-2026150004-1
Statement period: 01 Mar 2025 to 31 Mar 2025
Currency: GBP
Opening balance: 80541.08
Date Payment type Details Paid out Paid in
02 Mar 2025 DD HARBOURLIGHT IT REF817986 4279.88
03 Mar 2025 DD OSPREY LEASING REF478240 13931.68
04 Mar 2025 DD AURORA CONSULTING LTD REF456795 5263.32
11 Mar 2025 BP EASTFIELD ENERGY REF476696 2563.76
11 Mar 2025 TFR LARKSPUR TRAVEL REF628379 13761.42
15 Mar 2025 FPI LARKSPUR TRAVEL REF212558 9853.42
15 Mar 2025 CR CASTLEGATE PROPERTY REF313163 1651.44
17 Mar 2025 BP CASTLEGATE PROPERTY REF338441 677.12
17 Mar 2025 CR KESTREL INSURANCE REF397649 1785.00
22 Mar 2025 CR HARBOURLIGHT IT REF967609 5803.17
22 Mar 2025 DD JUNIPER PAYROLL REF961300 9670.82
25 Mar 2025 DD MOORLAND TELECOM REF358665 6743.41
25 Mar 2025 FPI AURORA CONSULTING LTD REF564655 14700.27
25 Mar 2025 SO GREENHOLM FOODS REF396165 8963.99
27 Mar 2025 SO AURORA CONSULTING LTD REF374022 5460.61
29 Mar 2025 CR AURORA CONSULTING LTD REF228754 10370.33
30 Mar 2025 DD IRONBRIDGE TOOLING REF587287 1567.95
31 Mar 2025 FPI HARBOURLIGHT IT REF957604 5498.18
rbs_transactions.csv5 changed lines · first at line 3
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/03/2025","BAL","OPENING BALANCE","62814.39","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"03/06/2025","FPO","FPO BRAMBLE LOGISTICS REF875914","-10077.48","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"03/07/2025","DD","DD NORTHGATE CLEANING REF406993","-14249.90","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"03/07/2025","TFR","TFR NORTHGATE CLEANING REF326931","9956.65","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"03/08/2025","CR","CR MOORLAND TELECOM REF209069","14349.16","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"10/03/2025","TFR","TFR HARBOURLIGHT IT REF653014","10175.88","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"12/03/2025","TFR","TFR FENWICK & PARTNERS REF505017","14440.72","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"12/03/2025","BP","BP KESTREL INSURANCE REF116560","-13970.07","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"12/03/2025","TFR","TFR BRAMBLE LOGISTICS REF688184","8313.46","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"03/12/2025","BP","BP FENWICK & PARTNERS REF692544","-2580.69","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"15/03/2025","SO","SO LARKSPUR TRAVEL REF185720","-1474.71","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"15/03/2025","TFR","TFR HARBOURLIGHT IT REF360770","8251.20","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"17/03/2025","FPO","FPO BRAMBLE LOGISTICS REF298420","-1437.65","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"18/03/2025","FPI","FPI HARBOURLIGHT IT REF973265","4785.41","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"19/03/2025","SO","SO JUNIPER PAYROLL REF719621","-2282.85","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"20/03/2025","FPO","FPO HARBOURLIGHT IT REF638870","-1232.01","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"22/03/2025","BP","BP GREENHOLM FOODS REF948626","-12171.89","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"23/03/2025","BP","BP AURORA CONSULTING LTD REF814644","-1956.89","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"26/03/2025","DD","DD AURORA CONSULTING LTD REF701166","-4253.87","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"29/03/2025","DD","DD HARBOURLIGHT IT REF259552","-7610.68","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"29/03/2025","FPO","FPO DELPHINIUM MEDIA REF197244","-9574.51","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"30/03/2025","FPO","FPO EASTFIELD ENERGY REF904206","-9624.79","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
"31/03/2025","FPO","FPO DELPHINIUM MEDIA REF151995","-4473.28","LEDGERBENCH DEMO LTD","72-18-66 69571792","acct-2026150004-3"
 

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-2026150004-1£84,841.77
acct-2026150004-2£132,672.69
acct-2026150004-3£36,115.60

Recorded runs on this case

  • wrongSingle prompt2 steps · 9,859 tokens · Confidence medium

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

  • exactAgent with tools19 steps · 41,919 tokens · Confidence high

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

Step through any of these on the demo page.