---
title: "DeepSeek API deepseek-flash now serves DeepSeek-V4.1-Flash-1017: 2026-10-17 | Harbyn"
description: "DeepSeek API deepseek-flash now serves DeepSeek-V4.1-Flash-1017, announced Oct 17, 2026."
canonical: "https://harbyn.com/changes/deepseek/2026-10-17-deepseek-v4-1-flash-1017-update"
last-updated: 2026-10-17
---

# DeepSeek API deepseek-flash now serves DeepSeek-V4.1-Flash-1017

Markdown version of <https://harbyn.com/changes/deepseek/2026-10-17-deepseek-v4-1-flash-1017-update>.

Behavior change - DeepSeek API. low severity. In effect.

The deepseek-flash model name now points to DeepSeek-V4.1-Flash-1017, so callers get the new model without changing code; calling method and pricing are unchanged. DeepSeek says it shortens task runtime and output length. The weights are also published on Hugging Face as deepseek-ai/DeepSeek-V4.1-Flash-1017.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [DeepSeek API](https://harbyn.com/vendors/deepseek.md) |
| Kind | Behavior change |
| Severity | low |
| Status | In effect |
| Announced | Oct 17, 2026 |
| Added to Harbyn | Oct 17, 2026 |
| Lead time | No dated deadline |
| Model IDs | `deepseek-flash` |
| Review | Reviewed by a person, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

The scanner reads your repository on your machine and reports every file and line that uses the identifiers above. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://api-docs.deepseek.com/updates/> (changelog, fetched 2026-10-17 13:00 UTC, sha256 `44aa1245d5d65d5fc54c8f47a9a3d3235e1ab064a8fc64d6a6e57f570ec8c99c`)

## Related changes

### More from DeepSeek API

- [Previous-generation V4 Flash models retired](https://harbyn.com/changes/deepseek/2026-09-10-previous-generation-v4-flash-models-retired.md) (Retirement, effective Sep 10, 2026)

### Changes at other vendors

- [Amazon Selling Partner API: ORDER\_CHANGE notifications add PreFulfillmentStatusChange for Amazon Autos](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-3.md) (effective Oct 28, 2026)
- [BigCommerce: 301 redirects will apply only to storefront channels](https://harbyn.com/changes/bigcommerce/2026-10-07-301-redirects-now-apply-to-storefront-channels-only.md) (effective Nov 10, 2026)
- [GitHub: Secret scanning audit log business field changes to enterprise slug](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-7.md) (effective Nov 12, 2026)
- [Jira / Atlassian Cloud: New IP address ranges in use from January 1, 2027](https://harbyn.com/changes/atlassian-jira/2026-10-16-atlassian-cloud-adds-new-ip-address-ranges.md) (effective Jan 1, 2027)

[All upcoming deadlines](https://harbyn.com/deadlines.md)