Anthropic Plugin

The Anthropic plugin provides access to Claude models through OpenAI-compatible endpoints in Go.

Configuration

import "github.com/firebase/genkit/go/plugins/compat_oai/anthropic"

g := genkit.Init(context.Background(), genkit.WithPlugins(&anthropic.Anthropic{
    Opts: []option.RequestOption{
        option.WithAPIKey("YOUR_ANTHROPIC_API_KEY"),
    },
}))

You must provide an API key from Anthropic. You can get an API key from the Anthropic Console.

Supported Models

claude-3-7-sonnet-20250219 - Latest Claude 3.7 Sonnet with advanced capabilities
claude-3-5-haiku-20241022 - Fast and efficient Claude 3.5 Haiku
claude-3-5-sonnet-20240620 - Balanced Claude 3.5 Sonnet
claude-3-opus-20240229 - Most capable Claude 3 model
claude-3-haiku-20240307 - Fastest Claude 3 model

Usage Example

import (
    "github.com/firebase/genkit/go/plugins/compat_oai/anthropic"
    "github.com/openai/openai-go/option"
)

// Initialize Anthropic plugin
claude := &anthropic.Anthropic{
    Opts: []option.RequestOption{
        option.WithAPIKey("YOUR_ANTHROPIC_API_KEY"),
    },
}
g, err := genkit.Init(ctx, genkit.WithPlugins(claude))

// Use Claude for tasks requiring reasoning
model := claude.Model(g, "claude-3-7-sonnet-20250219")
resp, err := genkit.Generate(ctx, g,
    ai.WithModel(model),
    ai.WithPrompt("Analyze this complex problem step by step."),
)

Using Multiple Providers

You can use both OpenAI and Anthropic providers in the same application:

import (
    "github.com/firebase/genkit/go/plugins/compat_oai/openai"
    "github.com/firebase/genkit/go/plugins/compat_oai/anthropic"
)

oai := &openai.OpenAI{APIKey: "YOUR_OPENAI_KEY"}
claude := &anthropic.Anthropic{
    Opts: []option.RequestOption{
        option.WithAPIKey("YOUR_ANTHROPIC_KEY"),
    },
}

g, err := genkit.Init(ctx, genkit.WithPlugins(oai, claude))

// Use OpenAI for embeddings and tool-heavy tasks
openaiModel := oai.Model(g, "gpt-4o")
embedder := oai.Embedder(g, "text-embedding-3-large")

// Use Anthropic for reasoning and analysis
claudeModel := claude.Model(g, "claude-3-7-sonnet-20250219")

Advanced Features

Multimodal Support

Claude models support vision capabilities:

// Works with Claude models
resp, err := genkit.Generate(ctx, g,
    ai.WithModel(model),
    ai.WithMessages(
        ai.NewUserMessage(
            ai.NewTextPart("What do you see in this image?"),
            ai.NewMediaPart("image/jpeg", imageData),
        ),
    ),
)

Streaming

Claude models support streaming responses:

resp, err := genkit.Generate(ctx, g,
    ai.WithModel(model),
    ai.WithPrompt("Write a long explanation."),
    ai.WithStreaming(func(ctx context.Context, chunk *ai.ModelResponseChunk) error {
        for _, content := range chunk.Content {
            fmt.Print(content.Text)
        }
        return nil
    }),
)

Configuration

Anthropic models support OpenAI-compatible configuration:

import "github.com/firebase/genkit/go/plugins/compat_oai"

config := &compat_oai.OpenAIConfig{
    Temperature:     0.7,
    MaxOutputTokens: 1000,
    TopP:            0.9,
    StopSequences:   []string{"END"},
}

resp, err := genkit.Generate(ctx, g,
    ai.WithModel(model),
    ai.WithPrompt("Your prompt here"),
    ai.WithConfig(config),
)