Fireworks AI
Production inference for open-source LLMs — function calling, structured output, fine-tuning.
Visit Fireworks AI Free $1 credit, then $0.20-$5/M tokens
What is Fireworks AI?
Fireworks AI is a production inference platform for open-source LLMs. Strong on function calling and structured output (JSON mode) — distinct from Together AI which focuses on raw speed. Used by enterprises building agentic workflows on open models.
Key features
- Strong function-calling support
- Structured output (JSON mode)
- Llama 4, Qwen3, DeepSeek, Mixtral
- Fine-tuning + LoRAs
- OpenAI-compatible API
- Enterprise SLAs
Pros
- Best open-model function calling
- JSON mode genuinely reliable
- Strong enterprise reliability
Cons
- Slightly slower than Together AI on raw throughput
- Smaller model catalog than OpenRouter
- Pricing parity with Together — not the cheapest
Best for
Agentic workflows on open modelsEnterprises needing reliable JSON outputTeams switching from closed to open modelsProduction AI apps
Alternatives to Fireworks AI
Coding
Together AI
Fastest inference for open-source models — Llama 4, Qwen3, DeepSeek V3 at low cost.
Open-model inference
FreemiumFree credits, then $0.20-$5/M tokens
Released June 2022
Coding
Modal
Serverless GPUs for AI — deploy any Python function at scale, pay per second.
Serverless GPU
Freemium$30/mo free credits, then pay-per-second
Released October 2021
Productivity
OpenRouter
One API for 300+ AI models — switch providers without rewriting code.
Multi-model gateway
FreemiumFree credits, then pay-per-token
Released May 2023