DeepSeek V4.1 Flash
DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture.
Model by DeepSeek
Install
Pick your client. Read the repository before you give any tool access to your data.
{
"model": "deepseek/deepseek-v4.1-flash",
"baseURL": "https://openrouter.ai/api/v1"
}OpenAI-compatible API: point any OpenAI SDK at the base URL and use this model id.
Settings it needs
OPENROUTER_API_KEYrequiredsecret
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About
Use cases: model-inference
Reviews
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Price and limits
| Variant | Input $/M tokens | Output $/M tokens | Cached input $/M |
|---|---|---|---|
| Standard | $0.02 | $1 | $0.015 |
Batch API deepseek/deepseek-v4.1-flash:batch | $0.05 | $0.15 | — |
Price as of Oct 26, 2026 from OpenRouter · provider's own prices: api-docs.deepseek.com. Prices change often; check before you rely on one.
- Provider
- DeepSeek
- Model id
deepseek/deepseek-v4.1-flash- Context window
- 1,048,576 tokens (1M)
- Max output
- 943,718 tokens
- Input
- text, image
- Output
- text
- Tool calling
- Yes
- Structured outputs
- Yes
- Reasoning
- Yes
- Weights
- Open: deepseek-ai/DeepSeek-V4.1-Flash
- Released
- Sep 10, 2026
Details
- Auth
- API key
- License
- License unknown
- Website
- www.deepseek.com
- First seen
- Oct 24, 2026
- Last checked
- Oct 26, 2026
- Source
- OpenRouter
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Cite this page
DeepSeek V4.1 Flash: price, context window, tool use. Agent Mart. https://agentmart.dev/models/deepseek-deepseek-v4-1-flash (last updated 2026-10-26)