DeepSeek LLM Provider

The DeepSeek provider connects Beluga AI to DeepSeek’s inference platform. DeepSeek exposes an OpenAI-compatible API, so this provider supports all standard features including streaming, tool calling, and structured output. DeepSeek is known for its DeepSeek-V3 and DeepSeek-R1 reasoning models.

Choose DeepSeek for strong reasoning and coding tasks at competitive prices. The DeepSeek-R1 model provides chain-of-thought reasoning similar to OpenAI’s o-series, while DeepSeek-V3 offers general-purpose chat with strong benchmark performance relative to its cost.

Installation

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

Configuration

Field	Required	Default	Description
Model	No	"deepseek-chat"	Model ID
APIKey	Yes	—	DeepSeek API key (sk-...)
BaseURL	No	https://api.deepseek.com/v1	Override API endpoint
Timeout	No	30s	Request timeout

Environment variables:

Variable	Maps to
DEEPSEEK_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/deepseek"
)

func main() {
    model, err := llm.New("deepseek", config.ProviderConfig{
        Model:  "deepseek-chat",
        APIKey: os.Getenv("DEEPSEEK_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(4096),
    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/deepseek"

model, err := deepseek.New(config.ProviderConfig{
    Model:  "deepseek-chat",
    APIKey: os.Getenv("DEEPSEEK_API_KEY"),
})

Available Models

Model ID	Description
deepseek-chat	DeepSeek V3 — general chat, strong coding
deepseek-reasoner	DeepSeek R1 — chain-of-thought reasoning model

Refer to DeepSeek’s documentation for the latest model list.