language-models

language-models

Stop memorizing model IDs. Start shipping.

You're building AI-powered applications, but every provider has different naming conventions. Is it claude-opus-4-5-20251101 or anthropic/claude-opus-4.5? Was it gpt-4o or openai/gpt-4o? You shouldn't have to care.

The Problem

// Without language-models: fragile, provider-specific, constantly breaking
const model = 'anthropic/claude-3-opus-20240229' // Wait, is this still current?
const model = 'claude-opus-4-5-20251101'         // Or was it this format?
const model = 'anthropic/claude-opus-4.5'        // Which one does OpenRouter want?

The Solution

// With language-models: simple, memorable, always resolves correctly
import { resolve } from 'language-models'

resolve('opus')   // 'anthropic/claude-opus-4.5'
resolve('sonnet') // 'anthropic/claude-sonnet-4.5'
resolve('gpt')    // 'openai/gpt-4o'
resolve('llama')  // 'meta-llama/llama-4-maverick'

Quick Start

1. Install

npm install language-models

2. Import

import { resolve, list, search } from 'language-models'

3. Use

// Resolve human-friendly aliases to full model IDs
const modelId = resolve('opus')

// Search across 200+ models
const claudeModels = search('claude')

// Get full model catalog with pricing and context info
const allModels = list()

API Reference

resolve(input: string): string

Resolve an alias or partial name to a full OpenRouter model ID.

resolve('opus')                      // 'anthropic/claude-opus-4.5'
resolve('sonnet')                    // 'anthropic/claude-sonnet-4.5'
resolve('gpt')                       // 'openai/gpt-4o'
resolve('llama')                     // 'meta-llama/llama-4-maverick'
resolve('anthropic/claude-opus-4.5') // Pass-through for full IDs

resolveWithProvider(input: string): ResolvedModel

Get full routing information including provider details for direct SDK access.

const info = resolveWithProvider('opus')
// {
//   id: 'anthropic/claude-opus-4.5',
//   provider: 'anthropic',
//   providerModelId: 'claude-opus-4-5-20251101',
//   supportsDirectRouting: true,
//   model: { name, pricing, context_length, ... }
// }

list(): ModelInfo[]

Get the complete model catalog with pricing, context lengths, and capabilities.

get(id: string): ModelInfo | undefined

Fetch a specific model by exact ID.

search(query: string): ModelInfo[]

Find models matching a search query across IDs and names.

Supported Aliases

You type	You get
opus	anthropic/claude-opus-4.5
sonnet	anthropic/claude-sonnet-4.5
haiku	anthropic/claude-haiku-4.5
gpt, gpt-4o, 4o	openai/gpt-4o
o1, o3, o3-mini	openai/o1, openai/o3, openai/o3-mini
gemini, flash	google/gemini-2.5-flash
gemini-pro	google/gemini-2.5-pro
llama, llama-4	meta-llama/llama-4-maverick
llama-70b	meta-llama/llama-3.3-70b-instruct
mistral	mistralai/mistral-large-2411
codestral	mistralai/codestral-2501
deepseek	deepseek/deepseek-chat
r1	deepseek/deepseek-r1
qwen	qwen/qwen3-235b-a22b
grok	x-ai/grok-3
sonar	perplexity/sonar-pro

Direct Provider Routing

For providers that support direct SDK access (Anthropic, OpenAI, Google), use resolveWithProvider to get the native model ID:

import { resolveWithProvider, DIRECT_PROVIDERS } from 'language-models'

const { provider, providerModelId, supportsDirectRouting } = resolveWithProvider('opus')

if (supportsDirectRouting) {
  // Use native SDK with providerModelId
} else {
  // Route through OpenRouter
}

Updating the Model Catalog

pnpm fetch-models

Fetches the latest models from OpenRouter and updates data/models.json.

License

MIT