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DeepSeek V4.1 Flash API

$0.3/Mtok in

DeepSeek · text

DeepSeek's cheapest current model, a million-token window at flash rates.

Open playgroundView API docs

Overview

About DeepSeek V4.1 Flash

DeepSeek's cheapest current model, a million-token window at flash rates. Every model on CompanyFabric shares the same API key, billing balance, and rate-limit envelope, one integration covers the entire library.

Facts

At a glance

Availability

Live

Pricing

$0.3/Mtok in

Metered exactly per call

Context window

1,000k tokens

Commercial use

See license

Commercial output use permitted per DeepSeek terms.

Variants

All endpoints

DeepSeek V4

Retired$0.3/Mtok in

Open-weight frontier-adjacent reasoning at commodity prices.

Chat Completions

DeepSeek V4.1 Flash

$0.3/Mtok in

DeepSeek's cheapest current model, a million-token window at flash rates.

Chat Completions

DeepSeek V4 Pro

Retiring$1.32/Mtok in

Retired by DeepSeek on 14 Sep 2026. Requests are served by V4.1 Flash from then, and billed at Flash's rate.

Chat Completions

DeepSeek V4 Flash

Retired$0.44/Mtok in

The V4 family's speed tier, near-V4 quality on everyday calls at the lowest price in the family.

Chat Completions

Quickstart

How to use the DeepSeek V4.1 Flash API

  1. 1

    Create a free CompanyFabric account, starter credits are included, no card required.

  2. 2

    Copy your API key from the dashboard. One key covers every model in the library.

  3. 3

    Point any OpenAI SDK at api.companyfabric.com/v1 and set model to "deepseek/deepseek-v4-1-flash".

  4. 4

    Read the exact metered cost of the call from the response, the same number shown in the playground.

Use cases

What teams build with it

Agents & copilots

Drive agent loops, tool calls, and user-facing assistants over the OpenAI-compatible endpoint.

agentstool useassistants

Content pipelines

Summarization, rewriting, and structured generation at metered per-token cost.

contentsummarization

Extraction & classification

Turn unstructured input into typed JSON with schema-constrained output.

extractionjson mode

Get better output

Prompting tips

  • State the output format before the task, models follow contracts declared early.
  • Few-shot beats description: two worked examples outperform a paragraph of rules.
  • Cap output length explicitly when cost matters; output tokens dominate most bills.

Exact, metered, prepaid

DeepSeek V4.1 Flash pricing

DeepSeek V4.1 Flash pricing is per token: $0.3 / M input · $1.2 / M output. Output tokens cost 4× input tokens, so long generations, not long prompts, are what actually drive most bills. A typical call with a 2k-token prompt and a 1k-token answer costs about $0.0018.

Every call is metered exactly and attributed to your key, the dashboard, the API usage response, and your invoice all read from the same ledger row. Cap any key's monthly spend with a budget cap, and bring your own provider key (BYOK) at 0% platform fee if you already have a direct contract.

EndpointTypePrice
DeepSeek V4Chat$0.3 / M input · $0.9 / M output
DeepSeek V4.1 FlashChat$0.3 / M input · $1.2 / M output
DeepSeek V4 ProChat$1.32 / M input · $3.96 / M output
DeepSeek V4 FlashChat$0.44 / M input · $1.32 / M output

Starter credits

Use DeepSeek V4.1 Flash free

Your CompanyFabric starter credits cover your first DeepSeek V4.1 Flash calls at no cost, create a free account, no card required, and the credits apply to DeepSeek V4.1 Flash and every other model on the key. When they run out, prepaid credits or BYOK (0% fee) take over with no plan to pick.

All ways to use AI models free →

Production-grade

Code samples

import OpenAI from "openai"

const client = new OpenAI({
  baseURL: "https://api.companyfabric.com/v1",
  apiKey: process.env.COMPANYFABRIC_API_KEY,
})

const res = await client.chat.completions.create({
  model: "deepseek/deepseek-v4-1-flash",
  max_tokens: 1024,
  temperature: 0.7,
  messages: [{ role: "user", content: "Say hello from the fabric." }],
})

console.log(res.choices[0].message.content)

Playground

Try it in the browser

Playground$0.3 in / $1.2 out per 1M tokens

Comparisons

DeepSeek V4.1 Flash vs the alternatives

DeepSeek V4.1 Flash vs Gemini 3.7 Flash

DeepSeek V4.1 Flash and Gemini 3.7 Flash compete for the same text workloads. Both run behind the same CompanyFabric key at exact metered prices, A/B them on your real prompts and let the outputs decide, then switch with a one-line change.

DeepSeek V4.1 Flash vs Claude Haiku 4.5

DeepSeek V4.1 Flash and Claude Haiku 4.5 compete for the same text workloads. Both run behind the same CompanyFabric key at exact metered prices, A/B them on your real prompts and let the outputs decide, then switch with a one-line change.

FAQ

Frequently asked questions

How much does the DeepSeek V4.1 Flash API cost?

$0.3 / M input · $1.2 / M output. Every call is metered exactly and shown before you run it.

How do I get a DeepSeek V4.1 Flash API key?

Create a CompanyFabric account, and one key unlocks DeepSeek V4.1 Flash and every other model in the library. Free starter credits are included, no subscription, no card required to try it.

Why use DeepSeek V4.1 Flash on CompanyFabric instead of going direct?

One key, one prepaid balance, and one rate-limit envelope across the whole library, at pricing at parity with or below the direct API. Model switching is a one-line change, and BYOK routing is 0% fee.

Is the API OpenAI-compatible?

Yes, point any OpenAI SDK at api.companyfabric.com/v1 and set model to "deepseek/deepseek-v4-1-flash".

Can I use the output commercially?

Commercial output use permitted per DeepSeek terms.

How does billing work?

Prepaid credits via card, or BYOK with your own provider keys at 0% platform fee. No subscription required; balances never expire.

Provider

About DeepSeek

DeepSeek publishes the deepseek family. Also in this family: DeepSeek V4, DeepSeek V4 Pro, DeepSeek V4 Flash. License: Commercial output use permitted per DeepSeek terms.

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One key. Every model. Exact prices.

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