modelmesh-lite 0.1.1

Capability-driven AI model routing with automatic failover and free-tier aggregation

One integration point for all your AI providers.
Automatic failover, free-tier aggregation, and capability-based routing.

---

Your application requests a capability (e.g. "chat completion"). ModelMesh picks the best available provider, rotates on failure, and chains free quotas across providers -- all behind a standard OpenAI SDK interface.

Install

Python:

pip install modelmesh-lite                # core (zero dependencies)
pip install modelmesh-lite[yaml]          # + YAML config support

TypeScript / Node.js:

npm install @nistrapa/modelmesh-core

Docker Proxy (any language):

cp .env.example .env   # add your API keys
docker compose up --build
# Proxy at http://localhost:8080 — speaks the OpenAI REST API

Quick Start

Set an API key and go:

export OPENAI_API_KEY="sk-..."

Python

import modelmesh

client = modelmesh.create("chat-completion")

response = client.chat.completions.create(
    model="chat-completion",          # virtual model name = capability pool
    messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)

TypeScript

import { create } from "@nistrapa/modelmesh-core";

const client = create("chat-completion");

const response = await client.chat.completions.create({
    model: "chat-completion",
    messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);

How It Works

client.chat.completions.create(model="chat-completion", ...)
       |
       v
  +-----------+     +-----------+     +----------+
  |  Router   | --> |   Pool    | --> |  Model   | --> Provider API
  +-----------+     +-----------+     +----------+
  Resolves the       Groups models     Selects best     Sends request,
  capability to      that can do       active model     handles retry
  a pool             the task          (rotation policy) and failover

"chat-completion" resolves to a pool containing all models that support chat. The pool's rotation policy picks the best active model. If it fails, the router retries with backoff, then rotates to the next model. When a provider's free quota runs out, rotation automatically moves to the next provider.

Multi-Provider Failover

Add more API keys -- ModelMesh chains them automatically:

export OPENAI_API_KEY="sk-..."
export ANTHROPIC_API_KEY="sk-ant-..."
export GOOGLE_API_KEY="AI..."

client = modelmesh.create("chat-completion")

# Inspect the providers behind the virtual model
print(client.describe())
# Pool "chat-completion" (strategy: stick-until-failure)
#   capability: generation.text-generation.chat-completion
#   → openai.gpt-4o [openai.llm.v1] (active)
#     openai.gpt-4o-mini [openai.llm.v1] (active)
#     anthropic.claude-sonnet-4 [anthropic.claude.v1] (active)
#     google.gemini-2.0-flash [google.gemini.v1] (active)

Same client.chat.completions.create() call -- but now if OpenAI is down or its quota is exhausted, the request routes to Anthropic, then Gemini.

YAML Configuration

For full control, use a configuration file:

# modelmesh.yaml
providers:
  openai.llm.v1:
    connector: openai.llm.v1
    config:
      api_key: "${secrets:OPENAI_API_KEY}"

  anthropic.claude.v1:
    connector: anthropic.claude.v1
    config:
      api_key: "${secrets:ANTHROPIC_API_KEY}"

models:
  openai.gpt-4o:
    provider: openai.llm.v1
    capabilities:
      - generation.text-generation.chat-completion

  anthropic.claude-sonnet-4:
    provider: anthropic.claude.v1
    capabilities:
      - generation.text-generation.chat-completion

pools:
  chat:
    capability: generation.text-generation.chat-completion
    strategy: stick-until-failure

client = modelmesh.create(config="modelmesh.yaml")

Key Features

Feature	Description
OpenAI-compatible	Drop-in replacement for any OpenAI SDK client
Multi-provider routing	OpenAI, Anthropic, Gemini, Groq, and more
Automatic failover	Retry with backoff, then rotate to next model
Free-tier aggregation	Chain quotas across providers
Capability-based pools	Request tasks, not specific providers
8 rotation strategies	Stick-until-failure, cost-first, latency-first, round-robin, and more
Pluggable connectors	Extend any integration point with the CDK
Zero dependencies	Core library has no external dependencies

Documentation

Document	Description
System Concept	Architecture, design, and full feature overview
Model Capabilities	Capability hierarchy tree and predefined pools
System Configuration	Full YAML configuration reference
Connector Catalogue	All pre-shipped connectors with config schemas
Connector Interfaces	Interface definitions for all connector types
System Services	Runtime objects: Router, Pool, Model, State
Proxy Guide	Deploy as OpenAI-compatible proxy: Docker, CLI, config, browser access
AI Agent Integration	Guide for AI coding agents (Claude Code, Cursor, etc.) to integrate ModelMesh

CDK (Connector Development Kit)

Document	Description
CDK Overview	Architecture and class hierarchy
Base Classes	Reference for all CDK base classes
Developer Guide	Tutorials: build your own connectors
Convenience Layer	QuickProvider and zero-config setup
Mixins	Cache, metrics, rate limiter, HTTP client

Samples

Collection	Description
Quickstart	6 progressive examples in Python and TypeScript
System Integration	Multi-provider, streaming, embeddings, cost optimization
CDK Tutorials	Build providers, rotation policies, and more
Custom Connectors	Full custom connector examples for all 6 types
Proxy Test	Vanilla JS browser test page for the OpenAI proxy

Development

# Clone the repository
git clone https://github.com/ApartsinProjects/ModelMesh.git
cd ModelMesh

# Run Python tests (855 tests)
pip install pytest
cd src/python && python -m pytest ../../tests/ -v

# Run TypeScript tests (511 tests)
cd src/typescript && npm install && npm test

# Or use the automation script
./scripts/test-all.sh

Docker

# Quick start with Docker Compose
cp .env.example .env    # then add your API keys
docker compose up --build

# Or use the automation script
./scripts/proxy-up.sh

# Test the running proxy
curl http://localhost:8080/v1/models
curl -X POST http://localhost:8080/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{"model":"text-generation","messages":[{"role":"user","content":"Hello!"}]}'

See the Proxy Guide for full configuration, CLI reference, and browser access.

Scripts

Script	Description
scripts/proxy-up.sh	Build and start the Docker proxy
scripts/proxy-down.sh	Stop the Docker proxy
scripts/proxy-test.sh	Smoke-test a running proxy
scripts/docker-build.sh	Build the Docker image
scripts/install-python.sh	Install Python package (dev or prod)
scripts/install-typescript.sh	Install TypeScript package
scripts/test-all.sh	Run full test suite (Python + TypeScript)

License

MIT

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_{Created by Sasha Apartsin}