Meta unveils Muse Spark 1.3 with coding improvements

Investing.com -- Meta Platforms (NASDAQ: META) released Muse Spark 1.3 today, with CEO Mark Zuckerberg announcing the update delivers frontier performance at low cost. The company said the release represents its largest improvement in coding and agentic work capabilities to date.

The model is now available through Muse Code and Meta's API. Zuckerberg said the company plans to release open weights versions in the near future.

Muse Spark 1.3 achieved a score of 98.5 on the MRCR 256K–512K benchmark and 98.1 on MRCR 512K–1M, the highest results in its comparison group for long-context understanding tests.

The model scored 75.4 on DeepSWE v1.1, 59.4 on SWEAtlas CodeBase QnA, and 88.8 on Terminal-Bench 2.1, leading in coding-related benchmarks. The Terminal-Bench score matched GPT-5.6's result.

In agent performance tests, Muse Spark 1.3 scored 1754 on GDPVal-AA v2, compared to Opus's 1824. The model achieved 64.9 on JobBench, 66.9 on OSWorld 2.0, and 49.4 on AutomationBench.

On DeepSearchQA, Muse Spark 1.3 scored 89.4 versus GPT-5.6's 93.0. The model's Agentic IF Index score reached 57.8, below GPT-5.6's 60.5.

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