Claude Opus 4 (2025-05-14) API

Language model · model id claude-opus-4-20250514

Claude Opus 4 (2025-05-14) is available through G0I — call it with a standard OpenAI-compatible request, the same way you call every other model on the platform.

How to call Claude Opus 4 (2025-05-14)

G0I is OpenAI-compatible. Point your client at https://g0i.ai/v1, set the model field to claude-opus-4-20250514, and send a chat completion via /v1/chat/completions:

curl https://g0i.ai/v1/chat/completions \
  -H "Authorization: Bearer $G0I_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-opus-4-20250514","messages":[{"role":"user","content":"Hello"}]}'

Why use Claude Opus 4 (2025-05-14) through G0I

One API key — Claude Opus 4 (2025-05-14) plus 470+ other models, no separate provider account.
OpenAI-compatible — works with the OpenAI SDK and any compatible tooling.
Switch freely — change the model field to compare Claude Opus 4 (2025-05-14) against other models with zero code changes.
Start free — create an account and test with a free token quota.

Get an API key — use Claude Opus 4 (2025-05-14) now →

Browse the full model catalog, read the quickstart, or see pricing. Looking for an OpenAI API alternative or a unified AI API? G0I covers it.