xAI released Grok 4.6 with a 500K context window and a $2/$6 per-million-token API price. It improved on Terminal-Bench, APEX-Agents, CursorBench and DeepSWE after a longer supplemental training run using model-generated reasoning data and agentic RL.

It is live in Cursor, Grok Build, OpenRouter, Vercel and Cloudflare — a distribution advantage that matters as much as the score.

xAI opened Grok Bot in beta on 11 August for SuperGrok subscribers on desktop and iOS, with Windows and Linux builds out and Android promised. The framing is deliberately not a chatbot: each Bot gets its own cloud computer, signs into the tools and sites you already use, and carries a job to the end, returning only when something needs approval. The launch post's own line is that there is a huge difference between 90% done and 100% done.

It arrives through an unusual corporate route — a SpaceX rollup that folded xAI and Cursor into one company — and rides distribution rather than novelty: Grok was already reported at roughly 117 million monthly active users in March 2026.

Meta released Muse Glimmer under Apache 2.0, optimized for always-on local agents, function calling, coding and judge workflows. The three-phase recipe used teacher-logit distillation, longer-context agent data, SFT, on-policy distillation and RL.

Weights landed with developer docs and integrations for llama.cpp, MLX and ExecuTorch. A 30B agent model that runs locally changes the privacy and latency calculus for personal tooling.

Anthropic reported an unreleased Claude combining results from separate papers to raise the proven lower bound on zeta zeros on the critical line from 41.6% to 67.2%. Claude also produced a publicly checkable Lean 4 proof; it did not prove the Riemann hypothesis.

Secondary reporting described roughly 36 hours of autonomous work across 60 subagents and 650 failed ideas. The important artifact is not the number, it is the formalization.