Claude Opus 4.8

by Anthropic

claude-opus-4-8

Overview

Claude Opus 4.8 is Anthropic's most capable model — built for the hardest reasoning, long agentic runs, and the most demanding coding and analysis. It plans, uses tools such as browsers and terminals, and operates autonomously over long horizons. On Kumo it runs on the same balance as every other model, billed below list.

Quick start

Simple code & API

Create an API key, point your SDK's base URL at Kumo, and call this model with the code you already have.

Create API key

curl https://api.kumo.cloud/v1/chat/completions \
  -H "Authorization: Bearer $KUMO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-opus-4-8",
    "messages": [{ "role": "user", "content": "Hello from Kumo" }]
  }'

OpenAI-compatible — base URL https://api.kumo.cloud/v1. Your KUMO_API_KEY is read from the environment.