Index9 MCP Server
The Index9 MCP Server provides up-to-date information and live testing capabilities for 300+ AI models from OpenRouter, helping you discover, compare, and evaluate models with current pricing, specifications, and performance data.
Key Capabilities:
Search and Filter Models: Use natural language queries or specific filters (provider, context window, price, capabilities) to discover relevant models from 300+ options
Get Detailed Specifications: Retrieve comprehensive technical details including pricing (input/output per million tokens), context window limits, capabilities (vision, audio, tool_calling, JSON mode, video), architecture, and per-request limits
Live Model Testing: Execute actual API calls to 1-5 models simultaneously using preset scenarios (quick math, code generation, reasoning, instruction following, tool calling) or custom prompts, measuring output quality, latency, token usage, and costs
Semantic Search: Find models using natural language descriptions with relevance scoring that combines semantic similarity, capability matching, and quality signals
Cost Analysis: Access current pricing and estimate costs for model usage, including extended pricing for image processing, audio, web search, and caching
Compare Models Side-by-Side: View pricing, release dates, architecture details (tokenizer, instruct type), moderation status, and performance metrics
Capability Filtering: Filter models by specific capabilities using AND logic to find models meeting multiple requirements
Pagination and Sorting: Browse results with pagination support and sort by relevance, price, release date, or context window size
Stay Current: Access regularly updated model information, solving the problem of outdated AI assistant knowledge
Note: Live testing requires an OpenRouter API key for billing purposes.
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@Index9 MCP Serverfind models with 128k context under $0.50 per million tokens"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
@index9/mcp
Discover, shortlist, compare, cost-model, and live-test 300+ AI models from your editor
Per-editor install configs (Cursor, VS Code, Claude Code, Codex): https://index9.dev/#install
Install
npx -y @index9/mcp@latestGeneric MCP client config:
{
"mcpServers": {
"index9": {
"command": "npx",
"args": ["-y", "@index9/mcp@latest"],
"env": {
"OPENROUTER_API_KEY": "sk-or-..."
}
}
}
}Claude Code one-liner: claude mcp add --transport stdio index9 -- npx -y @index9/mcp.
Related MCP server: Artificial Analysis MCP Server
OpenRouter API key
Required for live test_model calls. Set OPENROUTER_API_KEY in your MCP client config. dryRun=true works without it.
Tools
list_facets: List available providers, capabilities, modalities, and tokenizers
find_models: Search AI models by semantic query or filters
get_models: Fetch full model metadata for up to 100 IDs or aliases
compare_models: Diff 2-10 models across pricing, context, capabilities, and tokenizer
test_model: Run live inference or dry-run cost estimates on 1-10 models (requires OpenRouter API key)
Response metadata
All tool responses include an _index9 object with:
apiBaseUrl: API base URL used for the request
Error responses also include:
status: upstream HTTP status code_index9.retryAfterSeconds: present whenRetry-Afteris returned_index9.rateLimit: present when rate-limit headers are returned (x-ratelimit-limit,x-ratelimit-remaining,x-ratelimit-reset)
Maintenance
Resources
Unclaimed servers have limited discoverability.
Looking for Admin?
If you are the server author, to access and configure the admin panel.
Tools
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