*i would have come up with a similar list but i dont trust my own judgment here. maybe i'd sub in claude code vs codex but jury is a bit out still on that
Google seem to be making a lot of progress on agentic too, not only with Mariner, but with Project Astra, Call For Me, and their Agent2Agent protocol. There's probably much more to come here.
Oh and OpenAI is clearly willing to spend a lot of money to push this technology a bit further. If you look at the logs of Codex, it appears to be using a very strong (read: expensive) reasoning model to basically brute force the use of a VM. If you have a follow-up question in a Codex task, they just casually throw away the old VM and spin up a new one, running all setup again. If you compare this to e.g., Cursor, I'd wager Codex costs 5-10x more to perform a similarly sized task, though it's hard to tell for sure.