KeyoAPI

Claude Opus 5.5 API on KeyoAPI — Hard Agents

Claude Opus 5.5 on KeyoAPI is an Opus-class chat and agent model for hard coding and multi-step tool loops.

Listed price: ~$1.76 / $8.82 per 1M in/out · Confirm live rates on interactive pricing.

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Overview

Claude Opus 5.5 on KeyoAPI is an Opus-class chat and agent model for hard coding and multi-step tool loops. Indicative rates are about $1.76 / $8.82 per 1M in/out — confirm live on /pricing/claude-opus-5-5. Reserve it for escalations; keep Sonnet or cheaper chat IDs on the hot path. Same OpenAI-compatible gateway as other Keyo chat models.

Quick start

Base URL: https://www.keyoapi.xyz/v1

Endpoint: POST /v1/chat/completions

Model: model=claude-opus-5-5

curl https://www.keyoapi.xyz/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-opus-5-5","messages":[{"role":"user","content":"Hello from Claude Opus 5.5"}]}'

Auth uses the same Bearer API key as chat. Full notes: Keyo docs.

FAQ

Opus 5.5 vs Opus 5?

claude-opus-5-5 is the newer Opus-class ID (~$1.76/$8.82). claude-opus-5 remains available at a lower indicative band (~$1.10/$5.52). Confirm live on /pricing.

How do I integrate?

Keep your OpenAI SDK, set baseURL to https://www.keyoapi.xyz/v1, and use model=claude-opus-5-5.

Related models

Claude Opus 5 API Claude Sonnet 5 API Claude Fable 5 API

Guide for claude-opus-5-5. Try/buy: /pricing/claude-opus-5-5 · Catalog: /pricing.