Grok 4.6 launched August 12, 2026. Specs, the 200K pricing cliff, the Terminal-Bench version trap, and an honest read of where it beats and loses to Claude Opus 5 and Muse Spark 1.2.
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Five days after launching a closed paid coding agent, Meta shipped a 30B Apache-2.0 model and announced it will open-source Muse Spark 1.2. What changed, and what it means if you build on these models.
Meta released Muse Glimmer on August 10, 2026: 30B parameters, Apache 2.0, 128K context, runs under 20GB at 4-bit. Specs, honest benchmarks and how it compares to Qwen 3.6 and Gemma 4.
A verified setup guide for Meta's Muse Code: install, device-code auth, AGENTS.md, MCP, sandbox flags, CI runs and the errors people hit in the first 48 hours.
Meta published a benchmark chart where its own model loses to Claude Opus 5 -- and independent harnesses rank Muse Spark 1.2 lower still. A close read of the launch numbers.
Meta's contributor tier is 12-21x cheaper because it trains on your code -- and it's selected by a single config string. What engineering leaders should do about it.
Meta's Muse Code launched August 5, 2026. A head-to-head against Claude Code on benchmarks, pricing, parallel agents, sandboxing and ecosystem -- including why Meta's own numbers favour Anthropic.
Meta launched Muse Code on August 5, 2026. What it is, how to install it, what Muse Spark 1.2 costs, how the sandbox and subagents work, and whether the benchmarks hold up.