provider-fireworks (Fireworks AI)

You can run this example with:

npx promptfoo@latest init --example provider-fireworks
cd provider-fireworks

Usage

Set your FIREWORKS_API_KEY environment variable. You can get a key from fireworks.ai, sign in, open Settings -> API Keys, and create one.

Then run:

promptfoo eval

View the results with promptfoo view.

What this shows

• Three Fireworks serverless chat models (gpt-oss-120b, deepseek-v4-pro, kimi-k2p6) compared on a summarisation task. These are reasoning models, so max_tokens is set high enough to leave room for hidden reasoning tokens plus the visible answer.
• A similar assertion graded by a Fireworks embedding model via the fireworks:embedding: prefix.

Models rotate in and out of the serverless tier — if a model 404s, pick a current one from the serverless catalogue.