Long context

deepseek-v4.1-flash API pricing

DeepSeek's models — cost-efficient reasoning and coding.

Model IDdeepseek-v4.1-flash

ChatStreamingTool callingVision

Get API Key Run your first request

Call summary

Input

$0.18/ 1M tokens

Cache write $0.18

Output

$0.72/ 1M tokens

Cache read $0.0036

Context Window

API Endpoints

Available Configurations

deepseek-v4.1-flash API endpoints

One API key — call this model through any of the 3 endpoints below.

POST/v1/chat/completionsOpenAI-compatible · Works for every model

Docs

POST/v1/messagesAnthropic-native · Native for Claude Code

Docs

POST/v1/responsesResponses API · Native for Codex CLI

Docs

Production reliability

Privacy-safe aggregates from real Router One model calls, so you can assess stability and response latency before integrating.

Not enough production samples yet

This window needs at least 100 eligible requests across 5 independent principals. Metrics appear automatically after that threshold is met.

More DeepSeek models on Router One

1 other DeepSeek model on the same gateway and API key — its page lists endpoints, posted price, and context window.

deepseek-v4-flash$0.18 in / $0.72 out per 1M1M context

Call deepseek-v4.1-flash from your code

The same API key works across all 3 endpoints below.

Endpoint

/v1/chat/completions

Model ID

deepseek-v4.1-flash

Routing mode

auto

Request example

bash

curl -X POST \
  https://api.router.one/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "deepseek-v4.1-flash",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'

Get API Key

deepseek-v4.1-flash at a glance

deepseek-v4.1-flash is a DeepSeek-series text model on Router One. Posted rate: $0.18 in / $0.72 out per 1M tokens. Context window: 1M tokens. Accepts text, image; returns text. Endpoints: POST /v1/chat/completions (OpenAI-compatible), POST /v1/messages (Anthropic-native, the Claude Code path), POST /v1/responses (Responses API, the Codex CLI path).

deepseek-v4.1-flash FAQ

How much does deepseek-v4.1-flash cost on Router One?

deepseek-v4.1-flash is billed per token on Router One: $0.18 in / $0.72 out per 1M tokens, pay as you go.

Which endpoints serve deepseek-v4.1-flash?

deepseek-v4.1-flash is served on 3 endpoints — POST /v1/chat/completions (OpenAI-compatible), POST /v1/messages (Anthropic-native, the Claude Code path), POST /v1/responses (Responses API, the Codex CLI path). The same Router One API key works on each.

What is deepseek-v4.1-flash's context window?

deepseek-v4.1-flash accepts up to 1M tokens of context per request on Router One.

Start using deepseek-v4.1-flash

Create an API key and call deepseek-v4.1-flash at $0.18 in / $0.72 out per 1M tokens on Router One — pay as you go, with per-request cost and latency visibility.

Get API Key Plans & pay-as-you-go pricing Compare models side by side Quickstart guide