DeepSeek V4.1 Flash

Name: DeepSeek: DeepSeek V4.1 Flash
Brand: deepseek
SKU: deepseek/deepseek-v4.1-flash
Price: 0.05577 USD
Availability: InStock

deepseek/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.

$0.05577 in · $0.22308 out per 1M tokens1M contextSep 10, 2026

about 0.01¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with DeepSeek V4.1 Flash

Call it from code Lock this price

Also:latest 1017 1017 batch batch

Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens: $0.05577provider $0.0507
Output, per 1M tokens: $0.22308provider $0.2028
Cached input, per 1M: $0.0011154provider $0.001014
Margin: +10%

Context and formats

Context window: 1,048,576 tokens
Longest answer: 393,216 tokens
Reads: text and images
Makes: text
First listed: 2026-09-10

Measured here, last 7 days

First token, median: not measured
Answered without error: not measured

Tools and JSON

Tool calling: declaredthe provider's claim, not yet measured here
JSON output: declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=deepseek/deepseek-v4.1-flash.

About

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. It activates 8B parameters on input and 16B on...

In DeepSeek's words.

Try it here

Cmd+Enter sends

The answer appears here.

Measured here

We could not load the measurements. Try again.

Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

curl https://useantimatter.com/v1/chat/completions \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "deepseek/deepseek-v4.1-flash", "messages": [{"role": "user", "content": "Hello"}]}'

Everything else is in the docs.

Embed this

A badge showing this model's live price per million tokens, as billed here, for a README or a site. It links back to this page.

<a href="https://useantimatter.com/planet/deepseek/deepseek-v4.1-flash"><img src="https://useantimatter.com/api/badge/price?id=deepseek%2Fdeepseek-v4.1-flash" alt="DeepSeek V4.1 Flash price on Antimatter" height="28"></a>

Similar models from other labs

Closest in price and memory, from other labs.

Go back to the map, or take this model into a chat.