Biggest Vendor Pricing Moves in Week 6 of Sep 2026: DeepSeek V4.1 Flash, GLM-5.3-Flash, Anthropic

Deep dive into the three biggest vendor pricing moves in week 6 of Sep 2026: (1) DeepSeek V4.1 Flash valley pricing (¥1/M off-peak) takes effect 9/10 — first Chinese model with time-of-use pricing, (2) GLM-5.3-Flash 5-fold promo ended 9/9 — reverts to ¥0.8/M, (3) Anthropic Sonnet 5 / Opus 5 9/1 price hike cancelled. Includes work-hour arbitrage playbook, batch-job scheduling tips, and Sep 30 tokenrhythm ¥500 credit extension.