Cheap Claude Opus 5.5 API

What a top-up buys on Claude Opus 5.5

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

When to pick Claude Opus 5.5

Claude Opus 5.5 costs $0.02 per 1,500-in/500-out request at list price, $0.0080 effective. It sits in the mid price range — a good default for production apps.

Claude Opus 5.5 vs similarly priced models

Nearest models to Claude Opus 5.5 by blended price (3 input : 1 output). All run on one Somnus key.

Getting the most out of Claude Opus 5.5 for less

• Input is 5.0× cheaper than output on Claude Opus 5.5, so long context with short answers is the cheapest pattern.
• A $200 top-up gives $500 credit — about 63M blended Claude Opus 5.5 tokens.
• Mix models: send easy steps to DeepSeek V4 Flash and keep Claude Opus 5.5 for the steps that need it.

Other Claude models on Somnus

Every Anthropic model shares the same key and balance.

Use Claude Opus 5.5

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);

Model id: "claude-opus-5-5".

Questions

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