# Muse Spark 1.2 Muse Spark 1.2 is an AI model released by Meta on Aug 5 2026. It has a 1M context window. At release it scored 82.9% on Terminal-Bench 2.1 and 59.3% on DeepSWE 1.1. ## Facts | Field | Value | | --- | --- | | Model | Muse Spark 1.2 | | Developer | Meta | | Release date | Wednesday, Aug 5 2026 | | Licensing | Proprietary | | Context window | 1M | ## Benchmark scores published at release | Benchmark | Score | What it measures | | --- | --- | --- | | DeepSWE 1.1 | 59.3% | Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. (Version 1.1 of the test.) Higher is better. | | Terminal-Bench 2.1 | 82.9% | Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | ## 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. ## Questions and answers ### 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. --- Canonical page: https://aireleasetracker.com/model/meta/muse-spark-1.2 Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json Source: AI Release Tracker (https://aireleasetracker.com). Benchmark scores are the figures published by the releasing lab at launch.