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Anthropic · Model

Claude Opus 5 Free API

FreeNew

Claude Opus 5 Free 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-freeStarterProMax
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At a glance

Provider
Anthropic
Included in
Starter, Pro, Max — from $4.99/month
Weighted-token cost
0.7× — a 1,000-token exchange costs 700 weighted tokens
Context window
1M tokens
Free trial
Yes — the 25M free tokens every new account gets can be spent here

Call Claude Opus 5 Free

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

Questions about Claude Opus 5 Free

Is Claude Opus 5 Free free on apmix?
Yes. Every new account gets 25M free tokens that can be spent on Claude Opus 5 Free (claude-opus-5-free) and the other free models, with no daily limit and no expiry date. No card needed.
Which plan includes Claude Opus 5 Free?
Starter, Pro, Max. Each plan is a monthly allowance of weighted tokens shared across every model and every key; Claude Opus 5 Free counts at 0.7× per token.
How do I use Claude Opus 5 Free 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-free. The Docs page has copy-paste setup for each tool.

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