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Anthropic · Model

Claude Opus 5.5 API

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Claude Opus 5.5 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-5-5Max
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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 5.5

Call Claude Opus 5.5

Set the model to claude-opus-5-5 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-5-5", "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-5-5", "max_tokens": 1024, "messages": [{"role": "user", "content": "Hello"}]}'
Setup guides for Claude Code, Codex CLI, Cursor and more

Questions about Claude Opus 5.5

Is Claude Opus 5.5 free on apmix?
Not on the free tier. Claude Opus 5.5 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 5.5?
Max. Each plan is a monthly allowance of weighted tokens shared across every model and every key; Claude Opus 5.5 counts at 4× per token.
How do I use Claude Opus 5.5 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-5-5. The Docs page has copy-paste setup for each tool.

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