Claude Opus 5 Fast

Pay per token. Cached input is billed at 10% of the input rate.

Against the peers people actually weigh it against.

Up and running in under two minutes.

1. 1

   Create an API key

   Sign up and grab a key from the dashboard — $0.50 free credit, no card required.

   Get API key →
2. 2

   Make your first request

   Drop in your key and send a chat completion — fully OpenAI-compatible.

   cURLPythonTypeScript

   Copy

   curl https://kymaapi.com/v1/chat/completions \
     -H "Authorization: Bearer YOUR_API_KEY" \
     -H "Content-Type: application/json" \
     -d '{
       "model": "claude-opus-5-fast",
       "messages": [
         {"role": "user", "content": "Explain prompt caching in one paragraph."}
       ]
     }'

3. 3

   Stream responses

   Add "stream": true to receive tokens as they arrive.

   cURL

   Copy

   curl https://kymaapi.com/v1/chat/completions \
     -H "Authorization: Bearer YOUR_API_KEY" \
     -H "Content-Type: application/json" \
     -d '{
       "model": "claude-opus-5-fast",
       "stream": true,
       "messages": [{"role": "user", "content": "Hello!"}]
     }'