LLM Reference
OpenRouter

Using DeepSeek V4.1 Flash on OpenRouter

Implementation guide · DeepSeek V4.1 · DeepSeek

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OpenRouter exposes DeepSeek V4.1 Flash through model ID deepseek/deepseek-v4.1-flash. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-09-10. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at OpenRouter and generate an API key.
  2. 2
    Use the OpenRouter SDK or REST API to call deepseek/deepseek-v4.1-flash — see the documentation for request format.
  3. 3
    You'll be billed $0.15/1M input, $0.60/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

See OpenRouter documentation for integration details.

Pricing on OpenRouter

TypePrice (per 1M)
Input tokens$0.15
Output tokens$0.60

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. The DeepSeek API serves it as deepseek-flash; legacy API aliases deepseek-v4-flash and deepseek-v4-flash-vision-exp route to this model. Off-peak API pricing: $0.15/1M input, $0.60/1M output (cache read: $0.003/1M); peak hours are 2×.

Full model details →

Model Specs

Released2026-09-10
Parameters552B
Context1m
ArchitectureMixture of Experts

Also available on(1)

DeepSeek Platform$0.15/1M
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Provider

OpenRouter
OpenRouter

OpenRouter, Inc.

New York, NY, USA