# DeepSeek-V4.1-Flash

DeepSeek-V4.1-Flash is a DeepSeek language model released Sep 10, 2026; DeepSeek's newest language model in our dataset is DeepSeek-V4.1-Flash-1017. Open weights (MIT). DeepSeek's MIT-licensed V4.1 Flash model with a 1M-token context, released Sep 10, 2026 and updated to the 1017 version on Oct 17, 2026. Verified against vendor sources on Oct 26, 2026.

Last verified: 2026-10-26 · Evidence: Reported · Canonical: https://theagenticweekly.com/models/deepseek-v4-1-flash · JSON: https://theagenticweekly.com/api/models/deepseek-v4-1-flash

## Key facts

| Fact | Value | Source |
|---|---|---|
| Vendor | DeepSeek |  |
| Released | Sep 10, 2026 | https://api-docs.deepseek.com/updates/ |
| Latest update | Oct 17, 2026 | https://api-docs.deepseek.com/updates/ |
| API id | `deepseek-flash` | https://api-docs.deepseek.com/zh-cn/quick_start/pricing |
| Context window | 1,000,000 tokens (1M) | https://api-docs.deepseek.com/zh-cn/quick_start/pricing |
| Max output | 384,000 tokens | https://api-docs.deepseek.com/zh-cn/quick_start/pricing |
| Input | text, image | https://api-docs.deepseek.com/zh-cn/quick_start/pricing |
| Output | text | https://api-docs.deepseek.com/zh-cn/quick_start/pricing |
| Licence | MIT (open weights). License as listed on the Hugging Face model repository. | https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash-1017 |
| Pricing | ¥1 in / ¥4 out per 1M tokens; peak: ¥2 / ¥8. Official price list is in CNY. Off-peak shown; peak (Beijing time Mon-Fri 09-12 and 14-18) is double. We do not convert currencies because the USD table was not readable without JavaScript. | https://api-docs.deepseek.com/zh-cn/quick_start/pricing |

## Notes

- Superseded behind the deepseek-flash API name by DeepSeek-V4.1-Flash-1017 (Oct 17, 2026); see /models/deepseek-v4-1-flash-1017.

## What we tested

Nothing yet. We have not run DeepSeek-V4.1-Flash ourselves, so every fact here is Reported from the sources below.

## Sources

- [DeepSeek API updates](https://api-docs.deepseek.com/updates/)
- [DeepSeek pricing (zh-CN)](https://api-docs.deepseek.com/zh-cn/quick_start/pricing)
- [Hugging Face](https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash-1017)

Data licence: CC BY 4.0. Data: Agentic Weekly (https://theagenticweekly.com), CC BY 4.0.