That sentence made me assume OpenAI leaked this story to WSJ as a negotiating tactic. You're right that leaking this indicates OpenAI's position is weak. The threat to make an antitrust complaint is also strange since 'going nuclear' like that probably wouldn't help OpenAI soon enough to matter. Antitrust action isn't fast. So all it would do is potentially hurt MSFT and prove OpenAI is a risky partner willing to torch one of their largest partner/investors.