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DeepSeek: DeepSeek V4 Flash

deepseek-v4-flash

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DeepSeek V4 Flash costs $0.182 per million input tokens and $0.364 per million output tokens, supports 1.05M context, and is available through the OpenAI-compatible API.

DeepSeek V4 Flash is an efficiency-optimized Mixture-of-Experts model from DeepSeek with a 1M-token context window, built for fast inference, high-throughput workloads, reasoning, coding, and agent workflows.

Modalities

Text → Text

Input / output price

$0.182 / $0.364 per 1M

Context

1.05M · max output 384K

Capabilities

ReasoningTool callingLong contextOpen weights

Pricing

Billed per token actually used and deducted from your credits.

ItemUSD per 1M tokens
Input$0.182
Output$0.364
Cached input$0.0364

Calculator

Drag the sliders to estimate what this model will cost.

Per request
$0.00084
Per day
$0.4186
Per month (30 days)
$12.56

DeepSeek V4 Flash: input $0.182/M · output $0.364/M · cached input $0.0364/M

Request with these settings
curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "deepseek-v4-flash", "max_tokens": 800,
       "messages": [{"role": "user", "content": "…"}]}'

Code samples

OpenAI-compatible. Set the base URL to https://api.geniusrelaygpt.com/v1 and the model to deepseek-v4-flash.

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

Use it in a client: Cursor · Cline · SillyTavern · Codex

Parameters

Common OpenAI parameters can be passed as-is.

temperaturetop_pmax_tokensstreamstoppresence_penaltyfrequency_penaltyseed

FAQ

How is DeepSeek V4 Flash billed?
Input is $0.182 and output is $0.364 per million tokens; cached input is $0.0364. The charge for every request is listed in Usage Logs in the console.
How long is the context window?
1.05M tokens. In a long conversation every turn is billed for the full input, so keep the history under control.
Does it support streaming?
Yes. Add "stream": true to the request to receive server-sent events in the OpenAI format.
DeepSeek V4 Flash API pricing · GeniusRelay