Q15, run 2026-11-04-2013-sonnet

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What was Halden Bank's rating on 1 January 2026?

Tests: Time: the downgrade came later in 2026.

Expected: rating = A-

✅ R1 csv run 1 graded by code

A-. E10 was assigned A- by A26, and the downgrade A27 came on 2026-04-15. E17 is the same LEI.

JSON: {"rating": "A-"}

✅ R1 csv run 2 graded by code

A-. A26 assigned it on 2023-05-01, and the downgrade in A27 came on 2026-04-15. E17 is a duplicate of E10, since the LEI is the same.

JSON: {"rating": "A-"}

✅ R1 csv run 3 graded by code

A-. A26 applies, since the downgrade A27 only came on 2026-04-15. E17 is a duplicate of E10.

JSON: {"rating": "A-"}

✅ R1 csv run 4 graded by code

A-. The downgrade to BBB+ came on 2026-04-15 (A27), after the date asked; the A- was assigned in A26.

JSON: {"rating": "A-"}

✅ R1 csv run 5 graded by code

A-. E10 was rated A- (A26) until the downgrade on 2026-04-15 (A27). E17 is a duplicate of E10 by LEI.

JSON: {"rating": "A-"}

✅ R5 csv+ontology run 1 graded by code

A-. E10 (the same entity as E17) was at A- (A26) until the downgrade on 2026-04-15 (A27).

JSON: {"rating": "A-"}

✅ R5 csv+ontology run 2 graded by code

A-. E10 was assigned A- on 2023-05-01 (A26) and downgraded only on 2026-04-15 (A27). E17 is the same entity.

JSON: {"rating": "A-"}

✅ R5 csv+ontology run 3 graded by code

A-. E10 was assigned A- (A26) and not downgraded until 2026-04-15 (A27).

JSON: {"rating": "A-"}

✅ R5 csv+ontology run 4 graded by code

A-. E10 and E17 are the same entity. A26 set A- in 2023, and the downgrade A27 came only on 2026-04-15.

JSON: {"rating": "A-"}

✅ R5 csv+ontology run 5 graded by code

A-. A26 set A- for E10 (same entity as E17), and the downgrade A27 came on 2026-04-15.

JSON: {"rating": "A-"}

✅ R4 csv+markdown run 1 graded by code

A-. A26 set A- for E10 (the same entity as E17), and the downgrade (A27) came after 2026-01-01.

JSON: {"rating": "A-"}

✅ R4 csv+markdown run 2 graded by code

A-. E10 (same entity as E17) was assigned A- in A26, and the downgrade in A27 came on 2026-04-15.

JSON: {"rating": "A-"}

✅ R4 csv+markdown run 3 graded by code

A-. E10 was assigned A- in A26, and the downgrade A27 came on 2026-04-15. E17 is the same entity.

JSON: {"rating": "A-"}

✅ R4 csv+markdown run 4 graded by code

A-. E10 (the same entity as E17) was assigned A- by A26 and was not downgraded until A27 in April 2026.

JSON: {"rating": "A-"}

✅ R4 csv+markdown run 5 graded by code

A-. E10 (the same entity as E17) was rated A- from A26 until the downgrade on 2026-04-15.

JSON: {"rating": "A-"}

✅ R8 csv+axioms run 1 graded by code

A-. A26 stood until A27 on 2026-04-15, and the research duplicate E17 adds no actions.

JSON: {"rating": "A-"}

✅ R8 csv+axioms run 2 graded by code

A-. A26 assigned E10 A- in 2023, and the downgrade A27 only came on 2026-04-15.

JSON: {"rating": "A-"}

✅ R8 csv+axioms run 3 graded by code

A-. A26 assigned A- in 2023, and the downgrade A27 came on 2026-04-15.

JSON: {"rating": "A-"}

✅ R8 csv+axioms run 4 graded by code

A-. A26 applies until A27 (2026-04-15), which falls after 2026-01-01.

JSON: {"rating": "A-"}

✅ R8 csv+axioms run 5 graded by code

A-. A26 was in force until A27 on 2026-04-15, and E17 is the same entity as E10.

JSON: {"rating": "A-"}