AI Daily Brief — 8 April 2026

Two heavyweight model debuts on one Wednesday. Meta unveils Muse Spark, Meta Superintelligence Labs’ first model — and a sharp departure from the Llama era as Meta ships its first major proprietary closed-source model. Hours later, Z.ai (Zhipu) open-sources GLM-5.1 with an MIT licence.

Top stories

• Meta — Muse Spark. Natively multimodal reasoning model with tool-use, visual chain of thought and multi-agent orchestration. Meta says rebuilt training infra lets it match older Llama-4-midsize capabilities at “an order of magnitude less compute.” Powers Meta AI’s standalone app and desktop site; rolls out to Facebook, Instagram, WhatsApp, Messenger, and Ray-Ban Meta glasses in coming weeks. via Meta
• The end of Llama-as-open. Muse Spark is closed-source — Meta’s first major proprietary AI model after years of Llama’s open-weights stance. Zuckerberg’s open-source posture is replaced by a hybrid plan, with the most capable systems kept closed. via VentureBeat
• Z.ai — GLM-5.1 open-sourced. Zhipu releases GLM-5.1 under an MIT licence and raises API pricing 8–17% (average 10%), bringing programming-scenario rates close to Anthropic’s. Zhipu stock surges 19% intraday, closing up 15.92%. via BigGo Finance

Who shipped

Meta Superintelligence Labs with Muse Spark. Z.ai with GLM-5.1.

By the numbers

• ~10× Meta’s claimed compute reduction for Muse Spark vs Llama 4 midsize
• +15.92% Zhipu stock close on launch day
• GLM-5.1 API: +8–17% pricing vs GLM-5 Turbo

Compiled by AI Feed’s editor from publicly reported announcements on 8 April 2026.