# Muse Code + Muse Spark 1.2 — Meta ships a terminal coding agent

> Meta's new Muse Code coding agent lives in the terminal and ships with a co-trained Muse Spark 1.2 model.

- Org: Meta Superintelligence Labs
- Date: 2026-08-05
- Category: model, tool
- Source: https://research.meta.ai/blog/introducing-muse-code-and-muse-spark-1-2
- Canonical page: https://ai-tldr.dev/releases/meta-muse-code-spark-1-2/

## In short

Muse Code is Meta's new terminal coding agent, powered by a co-trained Muse Spark 1.2 model. It runs on macOS and Linux, keeps a local event log so long tasks survive crashes, and ships /plan, /grill, /goal skills at $1.25/$4.25 per million tokens.

## What it is

Muse Code is a new terminal-based coding agent from Meta Superintelligence Labs. It plans changes, writes code, and validates results across large repositories from a shell prompt on macOS and Linux, with no GUI. Muse Code installs with one curl command from dev.meta.ai and comes bundled with three built-in skills: /plan, /grill, and /goal.

## How it works

Muse Spark 1.2 was co-trained with Muse Code on long-horizon coding tasks, including whole-repository generation, so the model and the harness share one instruction format. The agent keeps a local event log for every tool call, which lets a crashed session replay to the exact same state and lets async background sub-agents run inside one session. Meta demonstrated the model optimizing GPU kernels over 1,000+ tool calls in a 24-hour run.

## Why it matters

Muse Code puts Meta directly against Claude Code and OpenAI Codex on the terminal-agent turf where coding customers live. Muse Spark 1.2 stays at $1.25 input and $4.25 output per million tokens on the Meta Model API, well under Claude Opus 5, and a contributor tier drops that price more than tenfold for developers willing to share session data.

## Who it's for

backend and infra developers who live in the terminal

## Try it

curl -fsSL https://dev.meta.ai/install.sh | bash

## Quick facts

- Maker: Meta Superintelligence Labs
- Products: Muse Code (terminal agent), Muse Spark 1.2 (model)
- Install: curl -fsSL https://dev.meta.ai/install.sh | bash
- Platforms: macOS and Linux (no Windows, no GUI)
- Availability: Public beta; Muse Spark 1.2 in Muse Code and Meta Model API
- Bundled skills: /plan, /grill, /goal
- Benchmarks reported: Terminal-Bench 2.1, DeepSWE 1.1, Meta Internal Coding Bench, GDPval

## FAQ

### How is Muse Code different from Claude Code and OpenAI Codex?

Muse Code is a terminal-only tool, with no GUI, that Meta co-trained end to end with Muse Spark 1.2 so the model and the harness share the same instruction format. It bundles /plan, /grill, and /goal skills, runs async background sub-agents, and installs with a single curl command on macOS or Linux.

### How much does Muse Spark 1.2 cost on the Meta Model API?

Muse Spark 1.2 stays at $1.25 per million input tokens and $4.25 per million output tokens on the pay-as-you-go tier — the same headline price as Muse Spark 1.1. A separate contributor tier is more than ten times cheaper for developers who agree to share their session data with Meta.

### Is Muse Spark 1.2 faster on coding than Muse Spark 1.1?

Meta reports gains for Muse Spark 1.2 on Terminal-Bench 2.1, DeepSWE 1.1, GDPval, and its internal coding benchmark, and highlights a 24-hour GPU-kernel-optimization run of 1,000+ tool calls. Meta explicitly says it is not claiming benchmark superiority over Claude Code or OpenAI Codex.

### Does Muse Code run on Windows?

Muse Code does not run on Windows at launch. The install script targets macOS and Linux, and there is no graphical application — the agent lives entirely in the terminal, which limits it to developers on those two operating systems for now.

### What happens if the terminal crashes mid-task?

Muse Code writes a local event log of every step, so a crashed or restarted session can replay to the same state without losing plan, tool calls, or intermediate reasoning. Meta says the same log lets async background sub-agents run alongside the main agent inside a single session.

## Links

- [Announcement](https://research.meta.ai/blog/introducing-muse-code-and-muse-spark-1-2)
- [Install page](https://dev.meta.ai)
- [9to5Mac coverage](https://9to5mac.com/2026/08/05/meta-launches-muse-code-ai-coding-agent-for-macos-and-linux/)
- [Unite.AI analysis](https://www.unite.ai/meta-ships-muse-code-coding-agent-with-co-trained-muse-spark-1-2-model/)