# DeepSeek — DeepSeek-V4.1-Flash Release 2026/09/10

- Company: DeepSeek (deepseek.com)
- Announced: 2026-09-10
- Category: new-model
- Coverage: 6 outlets
- Announcement: yes
- Group: models
- Source: https://www.deepseek.com/en/news/deepseek-v4-1-flash
- Record: https://forck.live/items/9775-deepseek-v4-1-flash-release-2026-09-10
- Subject: DeepSeek models
- Models affected: DeepSeek-V4.1-Flash, V4-Flash, V4-Flash-Vision-Exp, V4-Pro
- Pricing: Peak/off-peak pricing continues to balance demand. Off-peak rates are 50% of peak rates.

DeepSeek released V4.1-Flash, a 552B-parameter MoE model with a new Causal Encoder–Decoder architecture (8B active input, 16B active output parameters) and native visual understanding. The model is now live on the DeepSeek API, with V4-Flash and V4-Flash-Vision-Exp retired and V4-Pro being phased out. New pricing takes effect at 04:00 UTC on Sept 10, 2026.

## Evidence

Verbatim from https://www.deepseek.com/en/news/deepseek-v4-1-flash:

> 🔹 Introducing DeepSeek-V4.1-Flash: smarter, faster, more efficient.
> 🔹 552B-parameter MoE.
> 🔹 New Causal Encoder–Decoder architecture: just 8B active parameters for input, 16B for output.
> 🔹 V4.1-Flash is now live on the DeepSeek API with native multimodal support.
> 🔹 V4-Flash & V4-Flash-Vision-Exp are retired.
> 🔹 We're phasing out V4-Pro.
> 🔹 New pricing takes effect at 04:00 UTC on Sept 10, 2026.

## Around this story

Outlets this record can name and link:

- Reuters: https://reuters.com/world/asia-pacific/chinas-deepseek-launches-v41-flash-model-2026-09-10
- Bloomberg: https://bloomberg.com/news/articles/2026-09-10/deepseek-s-new-low-cost-model-deals-a-fresh-blow-to-openai-z-ai
- Caixin Global — China’s DeepSeek Launches Smaller, Faster AI Model: https://caixinglobal.com/2026-09-10/chinas-deepseek-launches-smaller-faster-ai-model-102483601.html
- The Decoder — New Deepseek model V4.1-Flash cuts memory needs for AI agents: https://the-decoder.com/new-deepseek-model-v4-1-flash-cuts-memory-needs-for-ai-agents
- Tech Times — DeepSeek V4.1-Flash Cuts Agent Memory Costs Fourfold With New Architecture: https://techtimes.com/articles/327163/20260910/deepseek-v41-flash-cuts-agent-memory-costs-fourfold-new-architecture.htm
- Techstrong.ai — DeepSeek Unveils V4.1-Flash Model with Architectural Upgrades, Price Cuts Ahead of Shanghai IPO: https://techstrong.ai/articles/deepseek-unveils-v4-1-flash-model-with-architectural-upgrades-price-cuts-ahead-of-shanghai-ipo

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