What are you surprised about? Yes, it's 5 versions younger, they're running a data flywheel, definitely scraping GPT-4 interactions when people use it through their website; v2 was just a shout-out to the community, to build goodwill and bring attention to their project. They've said on HN that they might release newer models – when they're no longer close to SoTA.
Thank you. Yes, it is the 7th iteration that started with our open-source models. We do plan to open source this model as well down the road, once we've released a few more generations.
It's business, not charity.