Omni-OpenRouter

OpenRouter thick provider for omnillm, providing access to 300+ AI models through the unified omnillm interface.

Installation

go get github.com/plexusone/omni-openrouter

Usage

As an omnillm Provider

Import the package for side effects to register the OpenRouter provider:

package main

import (
    "context"
    "os"

    _ "github.com/plexusone/omni-openrouter/omnillm"
    "github.com/plexusone/omnillm"
)

func main() {
    client, err := omnillm.NewChatClient(omnillm.Config{
        Provider: "openrouter",
        APIKey:   os.Getenv("OPENROUTER_API_KEY"),
        Model:    "anthropic/claude-3.5-sonnet",
    })
    if err != nil {
        panic(err)
    }
    defer client.Close()

    // Use the client as usual
    resp, err := client.CreateChatCompletion(context.Background(), &omnillm.ChatCompletionRequest{
        Model: "anthropic/claude-3.5-sonnet",
        Messages: []omnillm.Message{
            {Role: omnillm.RoleUser, Content: "Hello!"},
        },
    })
    // ...
}

OAuth PKCE Authentication

For interactive applications, you can use OAuth to authenticate:

package main

import (
    "context"
    "fmt"

    "github.com/plexusone/omni-openrouter/auth"
)

func main() {
    ctx := context.Background()

    // Perform OAuth login (opens browser)
    apiKey, err := auth.Login(ctx)
    if err != nil {
        panic(err)
    }

    fmt.Printf("API key obtained: %s...\n", apiKey[:10])

    // Later, retrieve the stored key
    storedKey, err := auth.LoadAPIKey(ctx)
    if err != nil {
        panic(err)
    }
    // ...
}

Supported Models

OpenRouter provides access to models from:

• Anthropic: Claude 4 Opus, Claude 4 Sonnet, Claude 3.5 Sonnet, etc.
• OpenAI: GPT-4 Turbo, GPT-4, GPT-3.5 Turbo, etc.
• Google: Gemini Pro, Gemini Ultra, etc.
• Meta: Llama 3, Llama 2, etc.
• Mistral: Mixtral, Mistral Large, etc.
• And 300+ more models

Model identifiers follow the format provider/model-name, for example:

• anthropic/claude-opus-4-20250514
• openai/gpt-4-turbo
• google/gemini-pro
• meta-llama/llama-3-70b-instruct

Features

• Full tool/function calling support
• Streaming completions
• Vision support (for compatible models)
• JSON mode (for compatible models)
• Automatic error classification for intelligent fallback

Configuration

The provider accepts the following configuration:

Field	Description
APIKey	OpenRouter API key (required)
BaseURL	Custom API endpoint (optional)
SiteURL	Your application URL for attribution (optional)
SiteName	Your application name for attribution (optional)

License

MIT