If you were previously a J-1 or F-1 holder, you may still be able to claim treaty benefits once you became an H-1 B visa holder., Researchers at research institutes working on projects with for-profit organizations may not claim treaty benefits.
Please see the following links.
Resident Alien Claiming a Treaty Exemption for a Scholarship or Fellowship
Tax Treaty Benefits for Worker, Trainees, Students, and Researchers
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