Fireworks AI LLM Provider

The Fireworks AI provider connects Beluga AI to Fireworks’ inference platform, which specializes in fast, cost-effective serving of open-source models. Fireworks exposes an OpenAI-compatible API, so this provider supports all standard features including streaming, tool calling, and structured output.

Choose Fireworks AI when you need fast inference for open-source models with competitive per-token pricing. Fireworks supports custom model deployments and fine-tuned models alongside its hosted catalog, making it suitable for production workloads that require both speed and cost efficiency.

Installation

go get github.com/lookatitude/beluga-ai/llm/providers/fireworks

Configuration

Field	Required	Default	Description
Model	No	"accounts/fireworks/models/llama-v3p1-70b-instruct"	Model ID
APIKey	Yes	—	Fireworks API key (fw_...)
BaseURL	No	https://api.fireworks.ai/inference/v1	Override API endpoint
Timeout	No	30s	Request timeout

Environment variables:

Variable	Maps to
FIREWORKS_API_KEY	APIKey

Basic Usage

package main

import (
    "context"
    "fmt"
    "log"
    "os"

    "github.com/lookatitude/beluga-ai/config"
    "github.com/lookatitude/beluga-ai/llm"
    "github.com/lookatitude/beluga-ai/schema"
    _ "github.com/lookatitude/beluga-ai/llm/providers/fireworks"
)

func main() {
    model, err := llm.New("fireworks", config.ProviderConfig{
        Model:  "accounts/fireworks/models/llama-v3p1-70b-instruct",
        APIKey: os.Getenv("FIREWORKS_API_KEY"),
    })
    if err != nil {
        log.Fatal(err)
    }

    msgs := []schema.Message{
        schema.NewSystemMessage("You are a helpful assistant."),
        schema.NewHumanMessage("What is the capital of France?"),
    }

    resp, err := model.Generate(context.Background(), msgs)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Println(resp.Text())
}

Streaming

for chunk, err := range model.Stream(context.Background(), msgs) {
    if err != nil {
        log.Fatal(err)
    }
    fmt.Print(chunk.Delta)
}
fmt.Println()

Advanced Features

Tool Calling

modelWithTools := model.BindTools(tools)
resp, err := modelWithTools.Generate(ctx, msgs, llm.WithToolChoice(llm.ToolChoiceAuto))

Structured Output

resp, err := model.Generate(ctx, msgs,
    llm.WithResponseFormat(llm.ResponseFormat{Type: "json_object"}),
)

Generation Options

resp, err := model.Generate(ctx, msgs,
    llm.WithTemperature(0.7),
    llm.WithMaxTokens(2048),
    llm.WithTopP(0.9),
    llm.WithStopSequences("END"),
)

Error Handling

resp, err := model.Generate(ctx, msgs)
if err != nil {
    log.Fatal(err)
}

Direct Construction

import "github.com/lookatitude/beluga-ai/llm/providers/fireworks"

model, err := fireworks.New(config.ProviderConfig{
    Model:  "accounts/fireworks/models/llama-v3p1-70b-instruct",
    APIKey: os.Getenv("FIREWORKS_API_KEY"),
})

Available Models

Model ID	Description
accounts/fireworks/models/llama-v3p1-70b-instruct	Llama 3.1 70B
accounts/fireworks/models/llama-v3p1-8b-instruct	Llama 3.1 8B
accounts/fireworks/models/mixtral-8x7b-instruct	Mixtral 8x7B
accounts/fireworks/models/qwen2p5-72b-instruct	Qwen 2.5 72B

Refer to Fireworks AI’s documentation for the full model catalog.