Cheap Claude Haiku 4.5 API

What a top-up buys on Claude Haiku 4.5

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

When to pick Claude Haiku 4.5

Claude Haiku 4.5 costs $0.0040 per 1,500-in/500-out request at list price, $0.0020 effective. It is one of the lowest-priced models available, ideal for high-volume work.

Claude Haiku 4.5 vs similarly priced models

Nearest models to Claude Haiku 4.5 by blended price (3 input : 1 output). All run on one Somnus key.

Getting the most out of Claude Haiku 4.5 for less

• Input is 5.0× cheaper than output on Claude Haiku 4.5, so long context with short answers is the cheapest pattern.
• A $200 top-up gives $500 credit — about 250M blended Claude Haiku 4.5 tokens.
• Mix models: send easy steps to DeepSeek V4 Flash and keep Claude Haiku 4.5 for the steps that need it.

Other Claude models on Somnus

Every Anthropic model shares the same key and balance.

Use Claude Haiku 4.5

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.SOMNUS_API_KEY,
  baseURL: "https://gateway-production-c837.up.railway.app/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);

Copy the exact model id from your dashboard.

Questions

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