Simon Willison's Weblog·3 weeks ago·
48
● 6 sources
Meta released Muse Spark 1.2, a coding-focused language model update trained on long-horizon tasks, alongside the Muse Code tool for integrated development workflows. Pricing starts at $1.25/$4.25 per million input/output tokens, or $0.10/$0.20 if users consent to data collection. The model demonstrates improved code generation and debugging capabilities compared to its predecessor.
Meta released Muse Code, a terminal-based AI coding agent that can handle large software projects by splitting tasks across parallel sub-agents. The tool works with Meta's Muse Spark model and can simultaneously handle multiple features without conflicts, as demonstrated in testing where it built six game features at once. This positions Meta as a more affordable alternative to OpenAI's Codex and Anthropic's Claude Code for enterprise software engineering workflows.
Meta released Muse Code, a beta terminal coding agent powered by its new Muse Spark 1.2 model, designed to handle complex software engineering tasks across large repositories by planning changes, writing code, and validating results. The system uses persistent async background agents and a local event log that enables crash recovery, and was evaluated on Terminal-Bench 2.1 (89 tasks), DeepSWE v1.1 (113 tasks), and Meta's internal coding benchmark (440 tasks). Developers can now deploy long-running coding agents with session persistence and multi-step task coordination, with the tool available for macOS and Linux via curl installation.
Meta released Muse Code, a terminal agent designed to handle long-horizon coding tasks autonomously. The system can interact with command-line interfaces and files to complete multi-step programming workflows. This enables developers to delegate extended coding projects to AI agents rather than managing each step manually.
Meta is collecting code fixes from 7,000 engineers using its internal MetaCode AI tool to improve its AI coding models, with over 800 corrections already submitted to refine Muse Spark 1.1 and train a model called Watermelon. The company's Muse Spark 1.1 scored 53% on the DeepSWE leaderboard in July, trailing GPT-5.6 Sol at 73% and Claude Opus 5 at 74%, while Meta's pricing at $1.25 per million input tokens is cheaper than competitors but facing pressure from price cuts and open-weight rivals. By capturing real engineering workflows rather than synthetic benchmarks, Meta aims to close the performance gap with frontier models and reduce costs of running coding agents across thousands of employees.
Every AI story that matters,
in your inbox by 8am.
TLDRocket reads all relevant sources, removes duplicate coverage, and summarises the
day in two minutes. Follow companies and topics for alerts, or get the
briefing in Slack. Free, no spam, unsubscribe anytime.
Reading TLDRocket needs no cookies, and the readership counts we rely on come from
our own cookieless analytics. Google Analytics is the exception: it sets cookies and
reports to Google, so it stays switched off until you allow it. You can change your
mind any time from “Cookie settings” in the footer.
Strictly necessary
Session security and form protection (tldrocket-session,
XSRF-TOKEN, 2 hours). The site cannot work without them,
so they need no consent.
Always on
Google Analytics 4 (_ga,
_ga_<id>, up to 2 years). Measures which
stories and sections readers use. Google acts as a third-party processor and may
store the data outside the EU. No advertising, no profiling, no data sold.