DeepSeek V4.1 Flash - Unifically

DeepSeek V4.1 Flash is DeepSeek’s September 2026 Flash model for agentic coding and long-context work, with a 1M-token context window, 384K max output, and thinking on by default. The deepseek/deepseek-flash ID always points at DeepSeek’s latest Flash model.

Model

deepseek/deepseek-flash


Provider	DeepSeek
Name	DeepSeek V4.1 Flash

Supported Endpoints

All three API formats are supported:

Chat Completions — POST /v1/chat/completions
Responses — POST /v1/responses
Messages — POST /v1/messages

DeepSeek models bill at 2x during peak hours: Monday to Friday, 01:00–04:00 and 06:00–10:00 UTC. The rate is fixed when the request starts. See pricing for current rates.

Example

curl -X POST https://api.unifically.com/v1/chat/completions   -H "Content-Type: application/json"   -H "Authorization: Bearer YOUR_API_KEY"   -d '{
    "model": "deepseek/deepseek-flash",
    "messages": [
      {"role": "user", "content": "Refactor this function to be more testable."}
    ]
  }'

Volume discounts are available for almost all models. Reach out at contact@unifically.com to discuss custom pricing.