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Cursor · Model

Composer 2.5 Fast API

Composer 2.5 Fast 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 Cursor account, no per-provider bill.

Model idcursor/composer-2.5-fastStarterProMax
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At a glance

Provider
Cursor
Included in
Starter, Pro, Max — from $4.99/month
Weighted-token cost
0.3× — a 1,000-token exchange costs 300 weighted tokens
Context window
200K tokens
Free trial
Paid plans only — the free models are the place to start

Call Composer 2.5 Fast

Set the model to composer-2.5-fast 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": "composer-2.5-fast", "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": "composer-2.5-fast", "max_tokens": 1024, "messages": [{"role": "user", "content": "Hello"}]}'
Setup guides for Claude Code, Codex CLI, Cursor and more

Questions about Composer 2.5 Fast

Is Composer 2.5 Fast free on apmix?
Not on the free trial. Composer 2.5 Fast is included from the Starter plan ($4.99/month), which covers every model in the catalog with one monthly allowance. You can still start free on the free Claude models.
Which plan includes Composer 2.5 Fast?
Starter, Pro, Max. Each plan is a monthly allowance of weighted tokens shared across every model and every key; Composer 2.5 Fast counts at 0.3× per token.
How do I use Composer 2.5 Fast 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 composer-2.5-fast. The Docs page has copy-paste setup for each tool.