---
title: "DeepSeek API Previous-generation V4 Flash models retired: 2026-09-10 | Harbyn"
description: "DeepSeek API Previous-generation V4 Flash models retired, effective Sep 10, 2026; replacement: deepseek-flash."
canonical: "https://harbyn.com/changes/deepseek/2026-09-10-previous-generation-v4-flash-models-retired"
last-updated: 2026-09-29
---

# DeepSeek API Previous-generation V4 Flash models retired

Markdown version of <https://harbyn.com/changes/deepseek/2026-09-10-previous-generation-v4-flash-models-retired>.

Retirement - DeepSeek API. high severity. In effect. History: recorded after the fact.

V4 Flash and V4 Flash Vision Exp have been retired. For compatibility, their model names are temporarily routed to V4.1 Flash.

The deadline passed on Sep 10, 2026.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [DeepSeek API](https://harbyn.com/vendors/deepseek.md) |
| Kind | Retirement |
| Severity | high |
| Status | In effect |
| Announced | Sep 10, 2026 |
| Effective | Sep 10, 2026 |
| Added to Harbyn | Sep 29, 2026 |
| Lead time | Recorded after the fact: added 19 days after the deadline |
| Model IDs | `deepseek-v4-flash`, `deepseek-v4-flash-vision-exp` |
| Replacement | `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, with the replacement. 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 2026-09-29 02:31 UTC, sha256 `2922113bc4e0e970fa6d3c4065c3cff3ec661a4db03d671cc2310545c5b5bb71`)

## Related changes

### More from DeepSeek API

- [deepseek-flash now serves DeepSeek-V4.1-Flash-1017](https://harbyn.com/changes/deepseek/2026-10-17-deepseek-v4-1-flash-1017-update.md) (Behavior change, announced Oct 17, 2026)

### Changes at other vendors

- [OpenRouter: arcee-ai/trinity-large-thinking expire 2026-10-26](https://harbyn.com/changes/openrouter/2026-10-23-arcee-ai-trinity-large-thinking-expires-2026-10-26.md) (effective Oct 26, 2026)
- [Google Cloud Run and Functions: Node.js 20 runtime decommission](https://harbyn.com/changes/google-cloud/2026-10-08-node-js-20-runtime-decommission.md) (effective Oct 30, 2026)
- [Mistral AI: Z.ai GLM 5.2 (zai-glm-5-2) retires on Mistral on October 31, 2026](https://harbyn.com/changes/mistral/2026-09-29-z-ai-glm-5-2-deprecated-and-scheduled-for-retirement.md) (effective Oct 31, 2026)
- [Fireworks AI: DeepSeek V4 Flash 0731 retires from Serverless Training November 2](https://harbyn.com/changes/fireworks/2026-10-18-upcoming-serverless-training-deprecation-deepseek-v4-flash-0731.md) (effective Nov 2, 2026)

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