DeepSeek V4.1 Flash

Official

deepseek/deepseek-v4.1-flash

DeepSeek V4.1 Flash — DeepSeek's newest Flash model, with native image input and a 1M-token context.

Get an API key View code sample

Context window: 1M
Max output: 384K
Input modalities: text · image
Output modalities: text
Capabilities: Vision · Reasoning · Tool calling · JSON mode · Coding · Prompt cache
Upstream release: 2026-09-10
RouteMux name: deepseek/deepseek-v4.1-flash
Official ID: deepseek-flash

Live model playground

Try DeepSeek V4.1 Flash here

Tune the request, see the current price ceiling, and inspect the real response without leaving this model page.

streamchat

1Configure input

Prompt

0 / 20,000

Add images

Maximum estimated cost—

2Live result

Your result will appear here

Enter an input on the left. The same RouteMux Playground execution and billing path powers this embedded test.

DeepSeek V4.1 Flash API pricing

Source: deepseek_official_usd_2026-10-06_peak · Verified 2026-10-06

InputOfficial $0.3 / M tokens

$0.3/ M tokens

OutputOfficial $1.2 / M tokens

$1.2/ M tokens

Cache read $0.006/M · Cache write —/M

Estimate cost

Input tokensOutput tokens

Estimated cost$0.0042

Limited time20% extra Credits on your first top-up — up to 200 bonus Credits

Applies to your first top-up within 72 hours of signing up. Minimum $20, once per account.

Key capabilities

VisionReasoningTool callingJSON modeCodingPrompt cache

Interface and protocols

OpenAI Chat CompletionsStreamingOpenAI ResponsesStreamingAnthropic MessagesStreaming

Use any of these IDs to call this model via the API.

RouteMux namedeepseek/deepseek-v4.1-flash

Official IDdeepseek-flash

Replace the ROUTEMUX_KEY placeholder with your API key. Create one →

from openai import OpenAI

client = OpenAI(
    base_url="https://api.routemux.com/v1",
    api_key="<ROUTEMUX_KEY>",
)

completion = client.chat.completions.create(
    model="deepseek/deepseek-v4.1-flash",
    messages=[{"role": "user", "content": "What is the meaning of life?"}],
)
print(completion.choices[0].message.content)

base_url: https://api.routemux.com/v1

Performance (last 30 days)

0 requests · last 30 days

Total usage—

P50 first-token latencyInsufficient data (0 requests)

Avg throughputInsufficient data (0 requests)

Success rate100.0%

Uptime · 24htested via openai_chat

100.00%

DeepSeek V4.1 Flash FAQ

›What is DeepSeek V4.1 Flash?

DeepSeek V4.1 Flash — DeepSeek's newest Flash model, with native image input and a 1M-token context.

›How large is the context window of DeepSeek V4.1 Flash?

DeepSeek V4.1 Flash supports a context window of up to 1M tokens, with up to 384K output tokens per request.

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

Through RouteMux, DeepSeek V4.1 Flash costs $0.3 for input and $1.2 for output (USD per 1M tokens), below the official list price.

›How do I call DeepSeek V4.1 Flash via API?

DeepSeek V4.1 Flash is OpenAI-compatible: point your base URL at RouteMux and set the model field to deepseek/deepseek-v4.1-flash — no code changes needed.

›Which input and output modalities does DeepSeek V4.1 Flash support?

DeepSeek V4.1 Flash accepts text, image as input and produces text as output.

›When was DeepSeek V4.1 Flash released?

DeepSeek V4.1 Flash was released on September 10, 2026.

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