Added Grok 4.7 and MiMo-V2.6 (Pro and Flash)

Grok 4.7 — xAI flagship (Sept 21, 2026) for coding and knowledge work. Larger than 4.6, better on long tasks and self-checks, same price/speed. $2 / $6 per M tokens.

MiMo-V2.6-Pro — Xiaomi open-weight flagship (MIT). 1.02T MoE / 42B active, 1M context, text+image+video+audio. Top-tier open model. API ~$0.44 / $0.87 per M tokens.

MiMo-V2.6-Flash — Cheaper Xiaomi twin. 309B / 15B active, same 1M context and modalities. Close to Pro on many agent tasks. API $0.14 / $0.28 per M tokens.