Fireworks AI

New

Run Llama, Mixtral, and 50+ open-source models at production speed — 3–5x cheaper than OpenAI-equivalent APIs with the same SDK you're already using.

Models

★ 4.6(2,800 reviews)freemium

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Overview

Fireworks AI is a fast inference platform for open-source models — Llama, Mixtral, Mistral, Gemma, and custom fine-tunes — with production-grade reliability. Latency benchmarks consistently outperform cloud providers for equivalent model quality, and pricing is 3–5x cheaper than OpenAI API equivalents at scale. Supports function calling, JSON mode, streaming, and fine-tuning via a fully OpenAI-compatible API.

Key Features

OpenAI-compatible API for instant drop-in replacement
50+ open-source models including Llama, Mixtral, and Gemma
Compound AI system deployment (multiple models in one call)
Function calling and JSON mode across all supported models
Fine-tuning API for custom model specialization
Sub-100ms time-to-first-token on most models

Pros

• Best-in-class latency for open-source model inference
• Significantly cheaper than OpenAI at scale
• OpenAI-compatible API means zero migration effort

Cons

• Smaller model selection than OpenRouter
• Fine-tuning has limited base model options vs dedicated platforms
• Free credit is small — production workloads require billing setup