DeepSeek
DeepSeek V4.1 Flash
deepseek/deepseek-v4.1-flash-1017
The October 17, 2026 snapshot of DeepSeek V4.1 Flash, a sparse mixture-of-experts model with open weights on Hugging Face. Built for volume when price per token decides.
RoleThe low-cost open-weight worker
$0.150
In / M
$0.600
Out / M
1.0M
Context
- AA intelligence index
- 28.6
- Inputs
- text, image
- Outputs
- text
- Tools
- Listed
- Structured output
- Listed
- Reasoning
- Listed
- Weights
- Open · deepseek-ai/DeepSeek-V4.1-Flash-1017
- Listed
- Oct 17, 2026
01 · What it's good at
Use it for this.
Three jobs this model is built for, and the ones to give to something else.
01
Bulk jobs where price per token decides
02
Reproducible runs: a dated snapshot with published weights
03
Tool calling, including parallel tool calls on the listing
Skip it for
- The hardest agent turns in your pipeline
02 · Example tasks
What you'd actually send it.
Real inputs, not a benchmark. Paste one into the snippet below to try it.
You send
Translate these 5,000 product titles to Spanish. Keep brand names and sizes unchanged.
Why this model
Volume work where cost per token adds up.
03 · Your stack
Where it sits: Do the volume.
Use it as the bulk worker or subagent when cost matters most, especially if you may self-host later.
Layer 01
Retrieve
Layer 02
Plan & reason
Layer 03 · this model
Do the volume
Layer 04
Gate & route
Layer 05
Draw, speak, listen
04 · Wire it up
One request. Paste and run.
Uses OpenRouter, so one key works for every model on this site. Set OPENROUTER_API_KEY and swap the prompt for one of the tasks above.
// OpenRouter speaks the OpenAI Chat Completions format.
const res = await fetch("https://openrouter.ai/api/v1/chat/completions", {
method: "POST",
headers: {
Authorization: `Bearer ${process.env.OPENROUTER_API_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
"model": "deepseek/deepseek-v4.1-flash-1017",
"messages": [
{
"role": "user",
"content": "Translate to Spanish, keep brand names unchanged: Acme UltraGrip Gloves, Size L"
}
],
"reasoning": {
"effort": "none"
}
}),
});
const data = await res.json();
console.log(data.choices[0].message.content);
05 · Watch out for
Gotchas.
Pin the dated id (-1017) when you need reproducible behavior. The undated V4.1 Flash listing is separate, with its own price.
Reasoning is on by default here; effort
noneturns it off.
Sources
Lessons are written from each model's listing and the linked docs. We don't publish our own benchmark numbers; the index above is Artificial Analysis, as shown on OpenRouter.
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