Meta Superintelligence Labs on August 5, 2026 released Muse Code, a terminal-based coding agent, along with Muse Spark 1.2, a coding-focused upgrade to the Muse Spark 1.1 model that shipped in July. The pair mark Meta's third major model release in four months and its most direct challenge yet to Anthropic's Claude Code and Google's Gemini coding stack.
What Muse Code Does
Muse Code takes on multi-step software tasks across large repositories: it plans changes, edits files, runs and validates tests, and can spin up multiple persistent subagents that stay alive across an entire session rather than being respawned for every task. Meta says the design cuts redundant context gathering and lets the agent survive crashes by replaying a local event log, resuming exactly where it left off on long-running jobs.
The client installs on macOS or Linux with a one-line curl command and ships with bundled skills — /plan, /grill, and /goal — that turn a task into an approval-gated plan, stress-test it, and drive it to completion.
Muse Spark 1.2 Under The Hood
Muse Spark 1.2 was co-trained with Muse Code so the model and its harness are tuned together, and Meta scaled up training compute on coding while expanding environment diversity. Independent benchmarks put Muse Spark 1.2 at 54 on the Artificial Analysis Intelligence Index, up three points from Muse Spark 1.1 and 11 points from the original April release. Meta also demoed 1,000-plus-tool-call kernel-optimization runs on NVIDIA Hopper GPUs, with the model iteratively rewriting Triton kernels to beat baseline implementations for KDA and MLA workloads.
Pricing And Availability
Standard API pricing is unchanged at $1.25 per million input tokens, $0.15 cached input, and $4.25 per million output tokens with a 1,048,576-token context. A new muse-spark-1.2-contributor tier offers a 12x-to-21x discount in exchange for permission to train future Meta models on the user's prompts and completions. Muse Spark 1.2 is live in Muse Code and available through the Meta Model API today.
The launch follows Meta's Muse Spark 1.1 breach disclosure the same day, and lands in a market where Anthropic, Alibaba, and enterprise coding startups are racing to own the agentic developer stack.
Reporting based on Meta AI Research, MarkTechPost and Artificial Analysis coverage.