Using DeepSeek V4.1 Flash on DeepSeek Platform

Implementation guide · DeepSeek V4.1 · DeepSeek

DeprecatedRetired October 17, 2026
Open Source

DeepSeek Platform exposes DeepSeek V4.1 Flash through model ID deepseek-flash. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-10-17. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at DeepSeek Platform and generate an API key.
  2. 2
    Use the DeepSeek Platform SDK or REST API to call deepseek-flash — see the documentation for request format.
  3. 3
    You'll be billed $0.30/1M input, $1.20/1M output tokens. See full pricing.
API PortalDocumentationPricing

Code Examples

See DeepSeek Platform documentation for integration details.

Pricing on DeepSeek Platform

TypePrice (per 1M)
Input tokens$0.30
Output tokens$1.20

Capabilities

VisionMultimodalReasoningJSON / Tool useStructured OutputsPrompt Caching

About DeepSeek V4.1 Flash

DeepSeek V4.1 Flash is a 552B-parameter (8B prefill / 16B decode activated) mixture-of-experts model with Compressed Expert Dispatch (CED), released September 10, 2026 under the MIT license. It supports 1M-token context, up to 384K output tokens, multimodal vision input, reasoning, function calling, tool use, structured outputs, and prompt caching. Weights are available on Hugging Face. On October 17, 2026 DeepSeek replaced it on its API, web and app with DeepSeek V4.1 Flash 1017; the API name deepseek-flash now serves the 1017 version. The September weights remain on Hugging Face and third-party hosts still serve them.

Full model details →

Model Specs

Released2026-09-10
Parameters552B
Context1M
ArchitectureMixture of Experts

More Models on DeepSeek Platform

DeepSeek V4.1 Flash 1017
All models on DeepSeek Platform →

Also available on(1)

OpenRouter$0.30/1M
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Provider

DeepSeek Platform

DeepSeek

Herzliya, Tel Aviv District, Israel