FULL STORY
DeepSeek V4.1-Flash: Launch and Real-World Tests
DeepSeek launched V4.1-Flash, a 552B MoE model with million-token context aimed at long-horizon agents. Developers then reported cutting AI costs by 90% after large-scale testing.
2026-09-18 ~ 2026-09-19 · 2 episodes · 6 posts
Episode 1 · DeepSeek Flash Becomes Default Workhorse, Cutting AI Costs 90% (2026-09-18, 2 posts)
Developer @btsouth pushed billions of tokens through DeepSeek V4.1 Flash in agent workflows and now treats it as a default workhorse for coding and debugging, cutting AI spend from about $300 to $30 per month.
- After pushing 2B tokens through DeepSeek V4.1 Flash, dev cuts AI bill from $300 to $30/month — gaganghotra_ · 2026-09-18
- After 7B+ tokens, developer says DeepSeek V4.1 Flash is his default workhorse — gaganghotra_ · 2026-09-19
Episode 2 · DeepSeek Launches V4.1-Flash with 1M-Token Context (2026-09-18, 4 posts)
DeepSeek released V4.1-Flash, a 552B-parameter multimodal MoE (8B active) with native vision and 1M-token context, compressing KV cache to 890 bytes per token; it is now live on Inco (topping speed charts at 532 tokens/s) and Nebius Token Factory.
- DeepSeek-V4.1-Flash lands on Nebius: 552B MoE activating 8B with 1M context — Arindam_1729 · 2026-09-18
- DeepSeek releases V4.1-Flash: smallest model in new family with native vision, $0.15/M tokens — aziz4ai · 2026-09-18
- DeepSeek V4.1 Flash hits 532 tokens/s on Inco, fastest output on Artificial Analysis — songhan_mit · 2026-09-18
- DeepSeek releases V4.1-Flash: 552B MoE with 1M context, KV cache cut to 890 bytes/token — deepseek-ai · 2026-09-18