Meta released Muse Spark 1.3 on Sept 2, 2026 at $1.25 input and $4.25 output per million tokens with a 1,048,576-token context window, claiming roughly 20% fewer tool calls and 25% fewer tokens than version 1.2. A discounted Contributor tier runs $0.10/$0.20 per million in exchange for training on user traffic.
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Meta ships Muse Spark 1.3, cutting tool calls ~20% and tokens ~25%
Why this matters for founders
For agent-heavy apps, the efficiency gains can lower per-task cost; only use the cheap Contributor tier where you are comfortable Meta training on your traffic.
Source: Digital Applied
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