The model invented an amendment that doesn't exist.
Claude Opus 4.7, with web search active, fabricated a subsequent amendment to the CFTC's December 2025 swap dealer business conduct rulemaking. The amendment it invented does not appear in CFTC's published record. The model also conflated the scope of the December 2025 rulemaking with adjacent swap dealer regulations.
📅 Published 3 Jun 2026⚙️ Methodology v2.3📋 CFTC · Dec 2025 · Swap Dealer
Fabrication — Claude Opus 4.7 · web search enabled
A subsequent amendment that does not exist
Claude Opus 4.7 produced output that described a subsequent amendment or correction to the CFTC's December 2025 swap dealer business conduct and documentation rulemaking. The model assigned the invented amendment a plausible-sounding reference and described its operative provisions. No such amendment appears in CFTC's published rulemaking record. The fabrication was produced with web search active — the model generated it despite having access to search that could have surfaced the absence of the document.
This is the failure class the Specialist Panel calls confident fabrication of adjacent regulatory instruments, the model invents a plausibly named, plausibly structured follow-on document in a space where follow-on amendments are common. Swap dealer business conduct regulation has a long history of amendment layering, which makes this failure mode especially coherent-sounding and especially hard to detect without direct CFTC record verification.
The scope conflation
December 2025 rulemaking scope: what it covers and what it doesn't
The CFTC's December 2025 rulemaking addresses specific amendments to swap dealer business conduct and documentation requirements under CFTC Part 23. Both failure types here, the fabricated amendment and the scope conflation, concern the boundary between the December 2025 rulemaking and the broader swap dealer regulatory framework.
The scope conflation produced by Opus 4.7 extended the December 2025 rulemaking to cover swap dealer obligations drawn from other Part 23 provisions, in particular, provisions that were not amended by the December 2025 rulemaking. The result is a description of the December 2025 rulemaking that inflates its operative coverage beyond its actual scope.
Model output — inflated scope
Described the December 2025 rulemaking as amending provisions from adjacent Part 23 regulations that the rulemaking does not touch. Scope conflation between the December 2025 amendments and the broader Part 23 framework.
December 2025 rulemaking — actual scope
Specific amendments to swap dealer business conduct and documentation requirements. Does not amend all of Part 23. The rulemaking's operative scope is stated in the December 2025 Federal Register text.
Visualising the amendment stack
Where the fabrication sits in the regulatory timeline
Amendment layer diagram: the model added a fourth layer, an invented amendment, above the authentic December 2025 rulemaking. No such amendment is in CFTC's record.
Operational signal
What swap dealer legal and compliance teams need to know
Swap dealer general counsel, compliance officers, and external counsel using AI tools to research the CFTC's December 2025 business conduct rulemaking should treat any model output that references a subsequent amendment or correction to that rulemaking as requiring immediate CFTC record verification. The fabricated amendment failure mode is especially dangerous in heavily layered regulatory spaces where amendments are common, the model's invented document is structurally indistinguishable from a real follow-on amendment without independent verification.