Skip to content
APMIX.AI
EN

Anthropic · Model

Claude Opus 5 API

Claude Opus 5 answers at api.apmix.ai under the id below — one key and one monthly plan, on the OpenAI and Anthropic wire formats your tools already speak. No separate Anthropic account, no per-provider bill.

Model idanthropic/claude-opus-5Max
Get an API key

At a glance

Provider
Anthropic
Included in
Max — from $29.99/month
Weighted-token cost
4× — a 1,000-token exchange costs 4K weighted tokens
Context window
1M tokens
Reasoning
Yes — thinks before it answers
Free tier
Paid plans only — the free models are the place to start
See what each plan buys on Claude Opus 5

Call Claude Opus 5

Set the model to claude-opus-5 in any OpenAI- or Anthropic-compatible client. Both base URLs accept the same apmix key.

OpenAI-compatible · Chat Completions
curl https://api.apmix.ai/v1/chat/completions \
  -H "Authorization: Bearer apx_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "claude-opus-5", "messages": [{"role": "user", "content": "Hello"}]}'
Anthropic-compatible · Messages
curl https://api.apmix.ai/v1/messages \
  -H "x-api-key: apx_live_YOUR_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{"model": "claude-opus-5", "max_tokens": 1024, "messages": [{"role": "user", "content": "Hello"}]}'
Setup guides for Claude Code, Codex CLI, Cursor and more

Questions about Claude Opus 5

Is Claude Opus 5 free on apmix?
Not on the free tier. Claude Opus 5 is included from the Max plan ($29.99/month), with one monthly allowance shared across every model in the plan. You can still start free on the free models.
Which plan includes Claude Opus 5?
Max. Each plan is a monthly allowance of weighted tokens shared across every model and every key; Claude Opus 5 counts at 4× per token.
How do I use Claude Opus 5 in Claude Code, Codex CLI or Cursor?
Point the tool at apmix — https://api.apmix.ai/v1 for OpenAI-compatible clients, https://api.apmix.ai for Anthropic-compatible ones — with your apmix key, and set the model to claude-opus-5. The Docs page has copy-paste setup for each tool.

More Anthropic models