Cheap DeepSeek V4.1 Flash API

What a top-up buys on DeepSeek V4.1 Flash

Output-token count only; input tokens are cheaper. First top-up is at least 2.5×.

When to pick DeepSeek V4.1 Flash

DeepSeek V4.1 Flash costs $0.0005 per 1,500-in/500-out request at list price, $0.0003 effective. It is one of the lowest-priced models available, ideal for high-volume work.

DeepSeek V4.1 Flash vs similarly priced models

Nearest models to DeepSeek V4.1 Flash by blended price (3 input : 1 output). All run on one Somnus key.

Getting the most out of DeepSeek V4.1 Flash for less

• Input is 4.0× cheaper than output on DeepSeek V4.1 Flash, so long context with short answers is the cheapest pattern.
• A $200 top-up gives $500 credit — about 1905M blended DeepSeek V4.1 Flash tokens.
• Mix models: send easy steps to Claude Haiku 5.5 and keep DeepSeek V4.1 Flash for the steps that need it.

Other DeepSeek models on Somnus

Every DeepSeek model shares the same key and balance.

Use DeepSeek V4.1 Flash

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.SOMNUS_API_KEY,
  baseURL: "https://somnus.world/api/public/gateway/v1",
});

const resp = await client.chat.completions.create({
  model: "claude-sonnet-5",
  messages: [
    {"role": "user", "content": "Summarise this in one line"}
  ],
});
console.log(resp.choices[0].message.content);

Model id: "deepseek-v4.1-flash".

Questions

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