Meta is upgrading its Muse Spark family with a new model aimed at long-horizon coding tasks and agentic software development while keeping its standard API pricing unchanged, giving development teams access to improved capabilities without paying more per token.
The new Muse Spark 1.3 model claims to complete coding tasks using about 25% fewer tokens and 20% fewer tool calls than its predecessor, potentially giving development teams more efficient AI-assisted coding at the same per-token price, the company wrote in a blog post.
The efficiency gains come from Muse Spark 1.3 taking fewer turns when they aren’t needed and producing less verbose responses, while improving its ability to sustain longer-running tasks by generating its own context, correcting gaps in its plan, following complex instructions, managing multiple workflows and recognizing its limitations, it added.
Productivity and cost benefits
For developers, the combination of improved capabilities and unchanged pricing could boost productivity while encouraging teams to use AI for a broader range of coding tasks, said Pareekh Jain, principal analyst at Pareekh Consulting.









