Muse Glimmer

Muse Glimmer is developed and released by Meta Platforms, specifically its Meta Superintelligence Labs research organization. Meta has a long track record of open AI research and releasing model weights to the developer community, and Muse Glimmer extends that tradition into local, agentic AI. The launch accompanied broader open-source messaging from the company, including plans to open the weights of its more advanced Muse Spark 1.2 model.

Muse Glimmer sits within Meta's wider Muse model family (Muse Spark, Muse Code, Muse Image) and is distributed through Meta's AI Developer Center and Hugging Face. As a Meta product it is not a standalone commercial offering with its own revenue model; the weights are given away free to drive adoption of Meta's open AI ecosystem.

Muse Glimmer is a dense causal transformer of roughly 29.6B parameters (including a ~1.8B ViT-G/14 perception encoder), with 52 layers, a 131,072+ token context window and a January 4, 2026 knowledge cutoff. It accepts interleaved text and image input and produces text output, and is trained on data from more than 100 languages. Its capabilities center on agents: end-to-end task completion, reliable schema-based tool and function calling, long-horizon multi-step reasoning, failure recovery, and compatibility with agentic scaffolds.

For local deployment, Meta quantizes the weights to roughly 4-bit precision (under 20 GB) and ships a DFlash speculative-decoding drafter that yields up to 3.1x faster generation on an RTX 5090. Released artifacts include full-precision BF16 weights, two 4-bit quant variants for 24/32 GB hardware, the drafter head and the perception encoder, all under Apache 2.0, with integrations across Hugging Face, Ollama, LM Studio, llama.cpp, MLX, ExecuTorch, vLLM and SGLang.

The primary audience is developers and technical teams building local or on-device AI agents, especially those with privacy, offline-operation or cost constraints that make cloud APIs unattractive. It also serves researchers who want a free, permissively licensed, fine-tunable model, and builders of coding agents, tool-use pipelines and multimodal agentic apps who need capable inference on a single consumer GPU or Mac.

Not separately disclosed. Muse Glimmer is a product of Meta Platforms (via Meta Superintelligence Labs) and is funded as part of Meta's broader AI investment rather than as an independently financed entity.