Summary
Vercel added Meta's Muse Spark 1.2 to AI Gateway with bring-your-own-key support and no markup. The 1.2 update focuses on code generation, complex debugging, codebase understanding, and long-horizon developer workflows such as generating whole repositories.
What changed
On August 5, 2026 Vercel made Meta's Muse Spark 1.2 available on AI Gateway. The release keeps general capabilities while improving code generation, debugging, codebase understanding, and end-to-end developer workflows, and supports bring-your-own-key with no markup.
Why it matters
Gateways compete on breadth of first-class model coverage. Adding a fresh Meta coding model with BYOK and no markup keeps AI Gateway attractive as a neutral routing layer and gives builders another frontier coding option without committing to a single provider's stack.
Evidence excerpt
While keeping its general capabilities, 1.2 ships with improvements in code generation, complex debugging, codebase understanding, and end-to-end developer workflows.