Meta Superintelligence Lab released a new AI model on Monday called Muse Ember, describing it as the lab's lightest and most cost-efficient model to date. The model is aimed at the repetitive work AI agents perform continuously, including tool calls, coding subtasks, routing, extraction, and parsing of long documents, according to Meta. Meta said Ember was built for complex reasoning execution.
Meta put particular weight on Ember's cost per task, citing Artificial Analysis's composite benchmark score to present Ember as both cheaper and smarter than Anthropic's Haiku and OpenAI's Luna. At 10 cents per million input tokens, Ember undercuts those frontier competitors on price, according to the company. Meta also positioned Ember as cost-competitive with open source competitors DeepSeek V4.1 Flash and GLM 5.3 Flash.
The model is intended to be paired with a larger model such as Meta's Muse Wonder inside an agentic harness, a design that reflects Meta's emphasis on low cost and accuracy at scale. In a customer-support agent, for example, a heavier model could set rules for handling a particular issue while a lighter-weight model applies those rules across tens of thousands of cases. Meta summarized the division of labor by saying that Muse Wonder plans while Muse Ember handles the volume.
Meta also trained Ember to work across multiple types of media, including text, images, and audio, which the company said makes the model flexible in the inputs it can accept. According to Meta, agents can read screenshots, charts, and scanned documents, or work from voice memos, meeting recordings, and video without a separate model. The training reflects the volume-heavy use cases Meta is targeting with Ember.
Ember is the fourth model released under Meta's Muse brand. It follows the mid-weight Spark, released in April, Spark's open source twin Glimmer, released in August, and the Wonder frontier model, released in October. The flagship consumer AI product, the Muse Agent, was released in September to unexpected success, with new features including Spaces and video chat rolling out earlier this month.
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