DeepSeek V4.1 Flash API

deepseek/deepseek-v4.1-flash

Use DeepSeek V4.1 Flash by DeepSeek through the Solo Router API: 1M-token context, reasoning and streaming. $0.39 per million input tokens and $1.56 per million output tokens, billed from prepaid credit.

Input

$0.39

per 1M tokens

Output

$1.56

per 1M tokens

Cached input

$0.008

per 1M tokens

Context window

tokens

Get an API key Try in chat

Example request

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

More from DeepSeek

Model	Context	Input / 1M	Output / 1M	Cached / 1M
DeepSeek V4.1 Flash (1017) deepseek/deepseek-v4.1-flash-1017	1M	$0.39	$1.56	$0.008
DeepSeek V4 Pro deepseek/deepseek-v4-pro	1M	$2.262	$4.524	$0.452
DeepSeek V4 Pro (0813) deepseek/deepseek-v4-pro-0813	1M	$1.716	$5.148	$0.057
DeepSeek V4 Flash deepseek/deepseek-v4-flash	1M	$0.182	$0.364	$0.036
DeepSeek V4 Flash (0731) deepseek/deepseek-v4-flash-0731	1M	$0.182	$0.364	$0.036
DeepSeek V3.2 deepseek/deepseek-v3.2	164K	$0.65	$2.08	$0.195

Frequently asked questions

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

$0.39 per million input tokens and $1.56 per million output tokens, and $0.008 per million cached input tokens. You pay from prepaid credit with no monthly fee.

How do I get DeepSeek V4.1 Flash API access?

Sign in to Solo Router with Google, create an API key and set "model": "deepseek/deepseek-v4.1-flash" in a chat-completions request to https://solorouter.ai/api/v1.

What is the context window of DeepSeek V4.1 Flash?

1,048,576 tokens.

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