AI Engineering Digest

xAI ships Grok 4.7 on the API.

Tuesday, September 22, 2026
Issue 22 · sourced briefing
Sources: xAI · Xiaomi · vLLM · mlx-vlm · Hugging Face · PyTorch · llama.cpp
Breaking Grok 4.7 public API id grok-4.7 — the frontier model id Issue 21 said was missing
Lead Story

xAI ships Grok 4.7 on the API — same list price as 4.6, encrypted reasoning on Responses

On Sep 21, SpaceXAI / xAI published Grok 4.7 with public API id grok-4.7 — the frontier model id Issue 21 explicitly noted as absent. 500k context; text+image in / text out; effort ladder includes xhigh.

Docs pricing: $2 / $0.50 / $6 per 1M tokens (input / cached input / output) below 200k prompt tokens, and $4 / $1 / $12 above. Announcement starts at $2/$6 in the same class as 4.6. Responses always returns encrypted reasoning content that clients must pass back unchanged.

Fast is Cursor + Grok Build only — not on the public xAI API. Availability spans the API, Cursor, Grok Build, Office add-ins, and gateways; consumer Grok surfaces later. Model card: pretrain cutoff June 2026; supplemental data through August 2026.

Why it matters: operators finally get the API id prior briefings watched for — pin grok-4.7, budget the context-tier price jump, and treat announcement / model-card benches as vendor / partner evals.

Sources: announcement · release notes · model card PDF

By the Numbers
$2/$6
Grok 4.7 starting list (in/out per 1M)
500k
Context window (docs)
v0.30.0
vLLM GA (~1:20 AM ET Sep 22)
0.7.2
mlx-vlm (~1:15 PM ET Sep 21)

Quiet lanes

Ollama still 0.34.3-rc1 · SGLang 0.5.20 · mlx 0.32.2 / mlx-lm 0.31.3


Today’s Stories
OSS models

Xiaomi opens MiMo-V2.6 Pro + Flash under MIT

Docs dated Sep 22 (HF weights ~11:39 AM ET Sep 21). Omnimodal MoE with 1M context: Pro 1.02T / 42B active; Flash 309B / 15B active. Also Distill-Qwen-9B + RL stack. Flag: vendor AA / DeepSWE claims.

Sources: Xiaomi · HF Pro · HF Flash

OSS tools

vLLM v0.30.0 ships day-0 DeepSeek-V4.1-Flash

~1:20 AM ET Sep 22: Fast Start ipc_cache, watermarking, HiSparse host-tier KV, plus DSv4.1-Flash / GLM-5.3-Flash / K2-Horizon paths. Breaking: scale-out needs --enable-scale-out.

Source: v0.30.0

MLX

mlx-vlm 0.7.2 adds Qwen-Image-2.1 + Mistral Large 3 VLM

~1:15 PM ET Sep 21: APC / DeepSeek-V4 fixes; new ports include Qwen-Image-2.1 (T2I + edit) and Mistral Large 3 (675B VLM). Core mlx / mlx-lm still quiet.

Source: v0.7.2

ML practice

Transformers loads GGUF / llama.cpp quants on Apple Silicon

Sep 22 HF blog: gguf_file= + ggml Metal via kernels; Qwen3.5 first. Needs Apple Silicon, recent PyTorch, transformers main. Laptop eval loop without a separate llama.cpp binary.

Source: HF blog

ML practice

PyTorch 2.14 — NVGEMM, NCCL rewrite, Apple Silicon linalg

Blog last-updated Sep 17 (missed Issues 19–21). NVGEMM for Inductor; nccl2 preview; native Apple Silicon linalg + MPS→Metal work; declarative dynamic shapes. Many APIs marked unstable.

Source: PyTorch blog

Local

llama.cpp tip b11101; Metal FA mask fix in b11093

Tip b11101 ~8:25 AM ET Sep 22. Metal flash-attention mask bounds fix in b11093 (~8:31 PM ET Sep 21). Snapdragon Hexagon NPU release assets landed in b11099 — see signal table.

Sources: b11101 · b11093


Other news in AI

None this window. NDCA slowdown suit already covered in Issue 21; no new court primary.


Signal Tables
Model / packageOrgNotes
Grok 4.7 (grok-4.7)
Sep 21
xAI API 500k · $2/$6 start · Fast not public
MiMo-V2.6 Pro / Flash
Sep 21–22
Xiaomi MIT omnimodal MoE · 1M ctx
vLLM v0.30.0
~1:20 AM ET Sep 22
vLLM GA DSv4.1-Flash day-0 · ipc_cache
mlx-vlm 0.7.2
~1:15 PM ET Sep 21
MLX GA Qwen-Image-2.1 · Mistral Large 3
llama.cpp tip b11101
~8:25 AM ET Sep 22
ggml Tip after Metal FA fix b11093
Snapdragon Hexagon NPU assets
b11099 ~3:59 AM ET Sep 22
ggml On-device Linux/Android release binaries
ItemBeatStatus
Claude Managed Agents auto permissions
Sep 10
Server evaluates agent / MCP tool calls Watch
Bedrock KB auto sync + Marengo 3.0
Sep 4 / Sep 11
Scheduled connector sync · multimodal embeddings Active
EU AI Board 9th meeting
Met Sep 17 · published Sep 18
Transparency rules · cyber/AI action plan Policy

Industry Shorts

Critical · Grok vendor evals + Fast not public

Pin API id grok-4.7; treat CursorBench / DeepSWE / Terminal-Bench / HealthBench figures as vendor / partner evals. Do not assume Fast is on the public xAI API — docs limit Fast to Cursor + Grok Build.

Watch · Claude auto permissions / EU transparency

Managed Agents auto moves production harnesses from always-ask toward server-evaluated policy. EU AI Board 9th meeting keeps transparency rules (applicable 2 Aug) and the cyber/AI action plan on the deployer checklist.

Opportunity · vLLM 0.30 · mlx-vlm 0.7.2 · MiMo Distill

Upgrade vLLM for DSv4.1-Flash day-0 + Fast Start cache. On Mac Studio: pip install -U mlx-vlm==0.7.2 and smoke mlx-community MiMo Distill OptiQ-4bit or Qwen-Image-2.1-MLX-4bit. Salesforce×GCP Dreamforce agent/infra (Sep 15) is partnership timing — Hyperforce migrations planned Q4 / NA GA Nov.


Try This

Upgrade mlx-vlm 0.7.2; smoke MiMo Distill or Qwen-Image-2.1

pip install -U mlx-vlm==0.7.2 then pull mlx-community/MiMo-V2.6-Distill-Qwen-9B-OptiQ-4bit or mlx-community/Qwen-Image-2.1-MLX-4bit on Mac Studio. Community quants — not Xiaomi-official MLX.

mlx-vlm 0.7.2 studio

Transformers GGUF path on Apple Silicon

On transformers main + kernels, load a Hub GGUF with gguf_file= and compare decode vs llama.cpp on the same Qwen3.5 quant. MPS packed path only for now.

transformers gguf metal

Issue 22 · Tuesday, September 22, 2026 · Not investment advice · Sources cited inline · Other news: none this window · Issue 21 Anthropic R&D pace / Accenture / Ollama RC / SGLang 0.5.20 / Speakeasy / NDCA suit not re-led