Meta releases Muse Spark 1.3, a model for programming and agents that uses a quarter fewer tokens
Prepared by Sintelligent with the help of SI. Publication time restored from the build log. . Updated: .
The race is no longer only about a model's intelligence but also its economy: agents are getting cheaper and more careful, which means they can be entrusted with more work.
Compared with version 1.2, the model makes about 20% fewer tool calls and uses 25% fewer tokens, sustains multi-step work in a single conversation for longer, and more often asks clarifying questions instead of making up a result. In max mode it scores 75.4 on DeepSWE v1.1 (Claude Opus 5 scores 74.0) and 66.9 on OSWorld 2.0, but that mode is closed for now until safety testing finishes; developers get xhigh mode. The model runs in Muse Code and the Meta Model API at $1.25/$4.25 per million tokens; the weights are closed.
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