Muse Spark 1.2
Muse Spark 1.2 is an AI model released by Meta on Wednesday, Aug 5 2026, 27 days after Muse Spark 1.1. It has a 1M token context window. Benchmark results (shown below) cover DeepSWE 1.1, and Terminal-Bench 2.1.
Benchmarks
About Muse Spark 1.2
Muse Spark 1.2, released August 5, 2026, was a coding-focused update to Muse Spark 1.1 that Meta shipped alongside Muse Code, its first coding agent — a terminal tool for macOS and Linux built around persistent background agents and parallel sub-agents in isolated git worktrees. Meta said the two were co-trained, which framed the release as an agent-plus-model product rather than a general model refresh: the pitch was repository-scale software engineering, with the model tuned for the harness it ships in.
The launch numbers were narrow and squarely on coding. Muse Spark 1.2 scored 82.9% on Terminal-Bench 2.1 and 59.3% on DeepSWE 1.1, in both cases the second-best figure on Meta's own comparison table behind Claude Opus 5 — a considerably tighter gap to the frontier than Muse Spark had managed at its April debut, when it posted 10.0% on DeepSWE 1.1. It carried a 1M-token context window and stayed proprietary, served through the Meta Model API at $1.25 per million input tokens against $4.25 per million output, roughly a third of what the flagship models it was benchmarked against charged at the time. Meta published the results as charts without a methodology write-up, so the comparison figures for rival models came from its own harness rather than each lab's.
Muse Spark 1.2 — frequently asked questions
- When was Muse Spark 1.2 released?
- Muse Spark 1.2 was released by Meta on Wednesday, Aug 5 2026.
- Who made Muse Spark 1.2?
- Muse Spark 1.2 was built by Meta. Develops the open-weight Llama series of models. Committed to open-source AI research.
- What benchmark scores did Muse Spark 1.2 get?
- Muse Spark 1.2 reports 2 tracked benchmark scores — DeepSWE 1.1: 59.3%; Terminal-Bench 2.1: 82.9%. Scores are the figures published at release by Meta.
- What is the context window of Muse Spark 1.2?
- Muse Spark 1.2 has a context window of 1M. That is the maximum amount of input plus output the model can hold in a single request.
- Is Muse Spark 1.2 open source?
- No. Muse Spark 1.2 is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
- What came before and after Muse Spark 1.2?
- Meta's previous tracked release was Muse Spark 1.1 on Jul 9 2026, 27 days earlier. It is the most recent Meta model tracked on AI Release Tracker.