MiniMax is usually open source but I'm not able to find any hints that m2.7 is open source yet, looks like it's made to compete with claude sonnet and has good reasoning and coding capabilities too. The most interesting part is that it's self improving, I'm going to look further into this but that definitely is something fun to look out for, they might just be copying autoresearch though ( autoresearch is a framework that automatically runs tests and trains AI overnight).
Here's a pretty decent example I found, taking in the possibility of no extra help and simple prompts, it doesn't really look that vibe coded.