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Bytedesk Now Supports DeepSeek-V4 with deepseek-v4-flash and deepseek-v4-pro

· 4 min read
Jack Ning
Jack Ning
Maintainer of Bytedesk

DeepSeek released the DeepSeek-V4 preview in April 2026 with two new model identifiers: deepseek-v4-flash and deepseek-v4-pro. The current version of Bytedesk already supports both models, so teams can switch to the latest DeepSeek generation directly from the admin console without changing their embedding flow.

What DeepSeek-V4 Changes​

According to the official DeepSeek announcement, the V4 preview brings several practical upgrades:

  • 1M context support for long documents, larger knowledge bases, and longer multi-turn sessions
  • stronger Agent performance for coding, document generation, and tool-driven workflows
  • clearer model positioning: deepseek-v4-pro for higher-end reasoning and agent tasks, deepseek-v4-flash for lower latency and better cost efficiency

For customer service, knowledge retrieval, and AI workflow automation, those improvements matter because the model can keep more context in memory and handle longer task chains more consistently.

DeepSeek Models Already Available in Bytedesk​

Under the DeepSeek provider, Bytedesk now exposes the following model options:

ModelPositioningTypical use case
deepseek-v4-flashFaster and more cost-efficientonline support bots, FAQ, high-volume chat
deepseek-v4-proStronger reasoning and agent capabilitycomplex business flows, deeper knowledge tasks, copilots
deepseek-chatLegacy model name, deprecated on 2026-07-24compatibility only
deepseek-reasonerLegacy model name, deprecated on 2026-07-24compatibility only

That means existing DeepSeek users can move to the new generation by updating the selected model in the AI model configuration page.

Deprecation of Legacy Model Names​

DeepSeek has announced that these legacy model names will stop working on 2026-07-24:

  • deepseek-chat
  • deepseek-reasoner

During the transition period, they remain available for backward compatibility:

  • deepseek-chat currently points to the non-thinking mode of deepseek-v4-flash
  • deepseek-reasoner currently points to the thinking mode of deepseek-v4-flash

For any new robot, workspace, or tenant-level AI setup, it is better to use deepseek-v4-flash or deepseek-v4-pro directly instead of continuing with the legacy names.

If you already run DeepSeek in production, use this migration path:

1. Replace Legacy Model Names​

Update your default model selection as follows:

  • deepseek-chat -> deepseek-v4-flash
  • deepseek-reasoner -> deepseek-v4-pro or deepseek-v4-flash

Choose deepseek-v4-flash when you want faster responses and lower cost. Choose deepseek-v4-pro when you want stronger reasoning, more complex agent behavior, or better long-chain task quality.

2. Keep the Same Base URL​

The DeepSeek API endpoint does not change:

https://api.deepseek.com

The migration is mainly about updating the model value, not the endpoint.

3. Switch Models in the Admin Console​

In Bytedesk, the migration can be completed from the admin UI:

  1. Sign in to the admin console
  2. Open AI model settings
  3. Choose DeepSeek as the provider
  4. Change the default model to deepseek-v4-flash or deepseek-v4-pro
  5. Save and verify the result with a chat test

This does not require reinserting chat code or changing the website integration path.

Practical Selection Advice​

  • Use deepseek-v4-flash as the default choice for standard customer-service bots
  • Use deepseek-v4-pro for harder knowledge tasks, AI assistants, and workflow copilots
  • Keep deepseek-chat and deepseek-reasoner only as a short-term compatibility bridge, then migrate before the shutdown date

Summary​

Bytedesk already supports the latest DeepSeek-V4 models, including deepseek-v4-flash and deepseek-v4-pro. If your team depends on long context, stronger reasoning, and better agent execution, this is the right time to move off the old model names and standardize on the V4 identifiers.