Bloomberg reports that Apple’s two-year-old partnership with OpenAI “has become strained, according to people familiar with the matter.” Bloomberg describes OpenAI as “failing to see the expected benefits from the deal and now preparing possible legal action.” OpenAI lawyers are actively working with an outside legal firm on a range of options that could be formally executed in the near future, said the people, who asked not to be identified because the deliberations are private. That could include sending the iPhone maker a notice alleging breach of contract without necessarily filing a…