Beckham is signing a one-year contract with the Dolphins, Ian Rapoport of NFL Network reports.
Dolphins general manager Chris Grier said Tuesday that there's "nothing imminent" on a deal between Beckham and the team, Marcel Louis-Jacques of ESPN.com reports.
Miami has extended a contract offer to Beckham, Adam Schefter of ESPN reports.
Beckham is set to visit the Dolphins on Thursday, Jordan Schultz of BleacherReport.com reports.
Beckham posted a goodbye message to Baltimore and Ravens fans on Instagram this Sunday, Jamison Hensley of ESPN.com reports.
The Ravens released Beckham on Wednesday, Ryan Mink of the team's official site reports.
Coach John Harbaugh and GM Eric DeCosta both suggested this week that they'd like Beckham to re-sign with the Ravens, Clifton Brown and Ryan Mink of the team's official website report. "[Beckham]'s become a great friend of mine and a friend to the Ravens," DeCosta said Tuesday. "I think we'll just kind of assess and see what happens over the next couple of weeks."
Beckham will sit out Saturday's regular-season finale versus the Steelers for rest purposes.
Beckham caught one pass for 33 yards on one target in Sunday's 56-19 win over the Dolphins.
Beckham caught two of three targets for 13 yards in Monday's 33-19 win over the 49ers.