Language model
DeepSeek V4.1 Flash
DeepSeek's fast open model for everyday chat, tool use, and coding.
- Status
- Available
- Parameters
- 552B backbone
- Context
- 1M
- Best for
- Everyday chat, tool use, and coding inside applications
Model IDs
| Model ID | Use |
|---|---|
deepseek-v4.1-flash | Fast general-purpose chat, tool use, and coding |
deepseek-v4.1-flash-eu | European provider endpoint |
Use one of the model IDs above with Chat Completions or Responses at https://tarka.rest/v1.
Pricing
deepseek-v4.1-flash: $0.33 input · $0.0066 cached input · $1.32 output per million tokens
deepseek-v4.1-flash-eu: $0.33 input · $0.0066 cached input · $1.32 output per million tokens
Overview
DeepSeek V4.1 Flash is DeepSeek’s open-weight model for fast, general-purpose work, released under the MIT license. It has 552 billion backbone parameters, activates 16 billion of them for each token it generates, and takes a context of about a million tokens.
When to pick it
- Chat and assistant features inside an application
- Agents that call tools many times in one task
- Coding help where response time matters
When to look elsewhere
- The hardest coding and agent work: try Kimi K3
- The highest volumes of simple requests: compare GLM-5.3 Flash
In a tool loop
When a response carries reasoning_content, send it back with that assistant
message in the next request. DeepSeek’s own API rejects tool requests that
drop it, so keep it in every turn.