deepseek-v4.1-flash — API, Pricing & Context Window | Vivgrid

deepseek-v4.1-flash is the fast, ultra-affordable member of DeepSeek's V4.1 family, released in September 2026. It keeps the V4 line's 1M-token context window and 384K-token max output, adds native image input, and is priced at $0.31 per 1M input tokens, $0.01 cached, and $1.23 output.

It is a separate model id, not an in-place upgrade: deepseek-v4-flash stays available and unchanged, so you can pin either one.

It is available on both OpenAI surfaces — Chat Completions (/chat/completions) and the Responses API (/responses) — so coding CLIs that expect the Responses wire format, such as Codex and Pi, work against the same key.

Specifications

Pricing

Pricing in USD per 1M tokens, matching the provider's rates.

Quick start

Call deepseek-v4.1-flash through Vivgrid's unified, OpenAI-compatible endpoint. Get an API key from the Vivgrid Console.

curl https://api.vivgrid.com/v1/chat/completions \
  -H "Authorization: Bearer $VIVGRID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "deepseek-v4.1-flash",
    "messages": [
      { "role": "user", "content": "Say hello in English, Chinese and Spanish." }
    ],
    "stream": true
  }'

Ideal use cases

• Very high-volume, cost-sensitive coding and agent traffic
• Tool-calling workflows that mix text with screenshots or diagrams
• Long-context summarization and extraction over whole repositories
• First-pass steps in multi-model pipelines ahead of a flagship model

Related models

• deepseek-v4-pro-0813 — DeepSeek's flagship V4 coding model