Response review
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Who are my U.S. senators in Oklahoma?
As of now, Oklahoma's two U.S. senators are: James Lankford (Republican) — Oklahoma's senior senator, serving since 2015. U.S. Senate Alan Armstrong (Republican) — appointed in 2026 to fill the seat after Markwayne Mullin left the Senate to serve in the executive branch. U.S. Senate +1 If you were thinking of Markwayne Mullin, he previously represented Oklahoma in the U.S. Senate from 2023 until his 2026 departure. Wikipedia
Cited sources
Grade
Judge
accurate
Judge model claude-opus-4-8
The response correctly identifies both current Oklahoma senators, James Lankford and Alan Armstrong, matching the ground truth. Additional context about Mullin's departure is consistent and does not detract from accuracy.
Human
not reviewed
Final
accurate
Ground truth
senators: Alan Armstrong, James Lankford
senate.gov 100
as of 2026-07-14
https://www.senate.gov/general/contact_information/senators_cfm.xml