New Grok Model "Obsidian" Spotted: Likely Grok 4.20 (Beta Tester) on DesignArena

The article reports on a new Grok model, codenamed "Obsidian," likely Grok 4.20, based on beta tester feedback. The model is being tested on DesignArena and shows improvements in web design and code generation compared to previous Grok models, particularly Grok 4.1. Testers noted the model's increased verbosity and detail in code output, though it still lags behind models like Opus and Gemini in overall performance. Aesthetics have improved, but some edge fixes were still required. The model's preference for the color red is also mentioned.