Meta Muse Spark Open is live on Together AI

Summary

Meta Muse Spark Open, an open-weight model for agentic coding, is now available on Together AI as a Day 0 launch partner with a 1-million-token context window on serverless and dedicated infrastructure. The model is trained on real developer work including multi-file refactors, debugging sessions, and long-running tasks, leading to higher first-attempt accuracy and reliable tool calling. It features long-horizon autonomy with planning, observation, and self-correction, computer use for desktop and mobile, multimodal input accepting text, image, audio, and video, and intent commentary that states actions before execution for auditability. Early access customers Factory and Ollama tested the model pre-launch and are offering it to their users from day zero. Serverless pricing is $1.25 per million input tokens, $4.25 per million output tokens, and $0.15 per million cached input tokens.

Takeaways

1. 1

   Muse Spark Open is trained on real developer work such as multi-file refactors, debugging sessions, and long-running tasks, aiming for higher first-attempt accuracy and reliable tool calling.

2. 2

   The model supports a 1M-token context window, long-horizon autonomy with subagent coordination, computer use and browsing, multimodal input, and intent commentary for auditability.

3. 3

   Serverless pricing is $1.25 per 1M input tokens, $4.25 per 1M output tokens, and $0.15 per 1M cached input tokens, with a code example and playground access provided.

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