Meta has introduced Muse Spark 1.2 and Muse Glimmer, with the ability to build and integrate with various Meta products. The model has an 8K context length and has been compared to other models like Gemini Pro 1.5 and Claude 3 Sonnet in benchmarks. The model can be used without logging in, but some features require a login. Meta plans to release longer context lengths in the future.