llmcycle 0.1.2

Cycle through multiple LLM providers with smart fallback, load balancing, and unified API

LLMCycle ♻️

The Production-Grade Universal LLM Router

Created by Bishwajit Garai — built from real pain, shipped for everyone.

📦 PyPI  ·  🐙 GitHub  ·  📖 Docs  ·  🤝 Contribute

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LLMCycle is an enterprise-grade universal LLM routing framework with zero mandatory dependencies. Route across 70+ providers, rotate unlimited API keys, handle every 4xx/5xx error gracefully, and stream with zero interruptions — even if your provider dies mid-response.

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💡 The Origin Story — Why We Built This

"I was building a production AI product and kept hitting the same walls — rate limits at 2 AM, API keys burning out mid-stream, no single library that handled all of it cleanly. I had to build the solution I wished existed." — Bishwajit Garai, creator of LLMCycle

The Problems We Faced

1. 429 Rate Limits Killed Production Traffic When you run at scale, 429 Too Many Requests is not an edge case — it's a daily reality. Existing routers would crash the entire request. We needed per-key cooldowns with auto-recovery.

2. API Keys Burned Out Without Warning With multiple keys across multiple providers, a single auth failure (401) would silently kill an entire provider. There was no library that tracked key health, disabled bad keys, and automatically rotated to healthy ones.

3. Mid-Stream Failures Were Catastrophic Streaming a 2000-token response and having the provider drop the connection at token 1800 meant starting from scratch. We needed seamless failover that captures partial context and continues from another provider without the user noticing.

4. Managing 70+ Provider Configs Was Painful Every provider has a different SDK, different error format, different auth header. We needed one unified interface that auto-discovers providers from .env keys — no boilerplate, no per-provider setup.

5. There Was No Visibility No dashboard, no analytics, no way to see which keys were healthy, which providers were slow, or how many tokens you were burning. We built all of that in.

The result: LLMCycle — one library that handles all of it, open source and free.

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⚡ 30-Second Quickstart

pip install llmcycle

import asyncio
from llmcycle import LLMCycle

async def main():
    client = LLMCycle()   # auto-loads from .env

    # Streaming with automatic failover
    async for chunk in client.stream("openai/gpt-4o-mini", "Explain RAG in 3 bullet points"):
        print(chunk, end="", flush=True)

asyncio.run(main())

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🏆 Why LLMCycle Beats LiteLLM

Feature	LiteLLM	LLMCycle
Multi-key per provider	❌	✅ Unlimited keys, auto round-robin
429 Rate-Limit handling	Basic	✅ Per-key cooldown, auto-recovery
401 Auth error	Raises exception	✅ Disables key, auto-rotates
Mid-stream failover	❌	✅ Captures partial text + continues
Sort-order routing	Basic	✅ Priority / Round-Robin / Lowest-Latency
Auto provider discovery	❌	✅ Reads *_API_KEYS from .env
70+ providers	✅	✅ Same coverage
Web Dashboard	❌	✅ Token-auth REST API + SPA UI
Zero mandatory deps	❌	✅ httpx + pydantic only

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⚙️ Configuration (.env)

# ── Keys: comma-separate for multi-key load balancing ──
OPENAI_API_KEYS=sk-key1,sk-key2,sk-key3
DEEPSEEK_API_KEYS=sk-ds-1,sk-ds-2
GROQ_API_KEYS=gsk-abc
TOGETHER_API_KEYS=ta-xyz
OLLAMA_API_KEYS=local                     # Ollama needs no real key

# ── Override any base URL ──
OLLAMA_BASE_URL=http://localhost:11434/v1

# ── Dashboard auth ──
LLMCYCLE_USER_ADMIN=admin
LLMCYCLE_USER_ADMIN_PAASWORD=admin

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💻 Full SDK Usage

Init with fallback chains

from llmcycle import LLMCycle
from llmcycle.core.router import RoutingStrategy

client = LLMCycle(
    env_path=".env",
    fallbacks={
        # provider-level: if deepseek is down, try groq, then openai
        "deepseek": ["groq", "openai"],

        # model-level: more specific, takes precedence
        "deepseek/deepseek-chat": [
            "groq/llama-3.1-70b-versatile",
            "openai/gpt-4o-mini",
        ],
    },
    strategy=RoutingStrategy.PRIORITY,   # or ROUND_ROBIN, LOWEST_LATENCY
)

List providers + keys health

providers = client.get_providers()
# → ['openai', 'deepseek', 'groq', 'together', 'ollama']

for p in providers:
    stats = client.key_manager.key_count(p)
    print(f"[{p}] {stats['active']}/{stats['total']} keys active")
    print(client.get_key_stats(p))

Fetch models from a provider

models = await client.get_models("groq")
print(models)  # ['llama-3.1-70b-versatile', 'mixtral-8x7b-32768', ...]

Non-streaming completion

response = await client.complete(
    model="deepseek/deepseek-chat",
    prompt="What is RAG?",
    temperature=0.7,
    max_tokens=512,
)
print(response.content)
print(f"Provider: {response.provider}, Latency: {response.latency_ms:.0f}ms")

Resilient streaming

# If deepseek drops mid-stream → silently continues with groq
async for chunk in client.stream("deepseek/deepseek-chat", "Write a haiku"):
    print(chunk, end="", flush=True)

Manual provider registration (no .env needed)

client.add_provider(
    name="myprovider",
    api_keys=["sk-abc", "sk-def"],
    base_url="https://api.myprovider.com/v1",
)

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🛡️ Error Handling

LLMCycle classifies every HTTP error into a specific exception and acts accordingly:

HTTP Status	Exception	Action Taken
429 rate-limit	RateLimitError	Rotate key, wait cooldown, retry
429 quota	QuotaExceededError	Rotate key, 1hr cooldown
402 payment	QuotaExceededError	Rotate key, 1hr cooldown
401 auth	AuthenticationError	Permanently disable key
400 content	ContentPolicyError	Fail fast — do NOT retry
400 bad req	ProviderError	Try next provider
5xx server	ProviderError	Try next provider
Stream drop	StreamInterruptedError	Failover with partial text context

You can catch them individually:

from llmcycle import RateLimitError, AuthenticationError, AllProvidersFailedError

try:
    resp = await client.complete("openai/gpt-4o", "Hello")
except AuthenticationError as e:
    print(f"Bad key for {e.provider}")
except AllProvidersFailedError as e:
    print(f"All providers failed: {e.errors}")

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🖥️ Web Dashboard

uv run llmcycle ui
# → http://127.0.0.1:8000

Login with LLMCYCLE_USER_ADMIN / LLMCYCLE_USER_ADMIN_PAASWORD from your .env.
The UI uses a token-based REST API (/api/token → Bearer token), not server-side rendering.

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🌐 Supported Providers (70+)

Frontier / Cloud

Provider	Env Prefix	Base URL
OpenAI	OPENAI	https://api.openai.com/v1
Anthropic	ANTHROPIC	https://api.anthropic.com/v1
Google AI Studio	GOOGLE	https://generativelanguage.googleapis.com/v1beta
Azure OpenAI	AZURE	Custom AZURE_BASE_URL required
AWS Bedrock	AWS_BEDROCK	Custom region URL

Fast Inference / Aggregators

Provider	Env Prefix	Base URL
Groq	GROQ	https://api.groq.com/openai/v1
Together AI	TOGETHER	https://api.together.xyz/v1
Fireworks AI	FIREWORKS	https://api.fireworks.ai/inference/v1
Perplexity	PERPLEXITY	https://api.perplexity.ai
OpenRouter	OPENROUTER	https://openrouter.ai/api/v1
DeepInfra	DEEPINFRA	https://api.deepinfra.com/v1/openai
Anyscale	ANYSCALE	https://api.endpoints.anyscale.com/v1
Novita AI	NOVITA	https://api.novita.ai/v3/openai
Featherless	FEATHERLESS	https://api.featherless.ai/v1
Lambda AI	LAMBDA	https://api.lambdalabs.com/v1
SambaNova	SAMBANOVA	https://api.sambanova.ai/v1
Cerebras	CEREBRAS	https://api.cerebras.ai/v1
Hyperbolic	HYPERBOLIC	https://api.hyperbolic.xyz/v1
Nebius AI	NEBIUS	https://api.studio.nebius.ai/v1
Nscale	NSCALE	https://inference.api.nscale.com/v1

Specialized

Provider	Env Prefix	Base URL
DeepSeek	DEEPSEEK	https://api.deepseek.com/v1
Mistral AI	MISTRAL	https://api.mistral.ai/v1
Codestral	CODESTRAL	https://codestral.mistral.ai/v1
Cohere	COHERE	https://api.cohere.com/v1
AI21	AI21	https://api.ai21.com/studio/v1
xAI (Grok)	XAI	https://api.x.ai/v1
Nvidia NIM	NVIDIA_NIM	https://integrate.api.nvidia.com/v1
GitHub Models	GITHUB	https://models.inference.ai.azure.com
Vercel AI	VERCEL	https://ai-gateway.vercel.sh
FriendliAI	FRIENDLIAI	https://inference.friendli.ai/v1

Chinese / Asia

Provider	Env Prefix	Base URL
Qwen (DashScope)	QWEN	https://dashscope.aliyuncs.com/compatible-mode/v1
Moonshot AI	MOONSHOT	https://api.moonshot.cn/v1
MiniMax	MINIMAX	https://api.minimax.chat/v1
Zhipu (Z.AI)	ZHIPU	https://open.bigmodel.cn/api/paas/v4
Volcano Engine	VOLCANO	https://ark.cn-beijing.volces.com/api/v3

Enterprise / Cloud

Provider	Env Prefix	Note
Databricks	DATABRICKS	Set DATABRICKS_BASE_URL
Snowflake	SNOWFLAKE	Set SNOWFLAKE_BASE_URL
WatsonX	WATSONX	https://us-south.ml.cloud.ibm.com
SAP AI Hub	SAP	Enterprise endpoint
Oracle OCI	OCI	Regional endpoint
Cloudflare AI	CLOUDFLARE	Set CLOUDFLARE_BASE_URL
Heroku	HEROKU	https://llm.api.heroku.com/v1
OVHCloud	OVH	EU sovereign cloud
Scaleway	SCALEWAY	https://api.scaleway.ai/v1

Local / Self-Hosted

Provider	Env Prefix	Default URL
Ollama	OLLAMA	http://localhost:11434/v1
LM Studio	LM_STUDIO	http://localhost:1234/v1
vLLM	VLLM	http://localhost:8000/v1
Llamafile	LLAMAFILE	http://localhost:8080/v1
Xinference	XINFERENCE	http://localhost:9997/v1

Any OpenAI-compatible provider works — just set MYPROVIDER_API_KEYS=... and MYPROVIDER_BASE_URL=https://...

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🔌 Routing Strategies

from llmcycle.core.router import RoutingStrategy

RoutingStrategy.PRIORITY        # Default: follow your fallback sort order
RoutingStrategy.ROUND_ROBIN     # Cycle across all providers equally
RoutingStrategy.LOWEST_LATENCY  # Always pick the statistically fastest provider

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🚀 CLI

llmcycle providers    # List all loaded providers + key health
llmcycle ui           # Start web dashboard (http://127.0.0.1:8000)
llmcycle ui --port 9000 --reload

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🗄️ Storage Layer

Persist sessions, users, requests, and full conversation history to any one backend. Pick exactly one — configured via .env or passed directly to the class.

Install your backend

uv add llmcycle[sqlite]    # SQLite  — zero config, local dev
uv add llmcycle[postgres]  # PostgreSQL
uv add llmcycle[mysql]     # MySQL / MariaDB
uv add llmcycle[mssql]     # Microsoft SQL Server
uv add llmcycle[mongo]     # MongoDB
uv add llmcycle[redis]     # Redis (best for sessions + caching)
uv add llmcycle[storage]   # All backends at once

Configure via .env (recommended)

# Choose ONE backend
LLMCYCLE_STORAGE_BACKEND=postgres
LLMCYCLE_STORAGE_URL=postgresql+asyncpg://user:pass@localhost/mydb

# Optional — default schema and table/collection prefix
LLMCYCLE_STORAGE_SCHEMA=analytics       # PostgreSQL/MSSQL schema
LLMCYCLE_STORAGE_TABLE_PREFIX=llm_      # Default: "llmc_"

Or pass directly (overrides env)

from llmcycle.storage import StorageBackend, StorageManager

# SQLite — zero config
store = StorageManager(StorageBackend.SQLITE)

# PostgreSQL with custom schema + prefix
store = StorageManager(
    backend=StorageBackend.POSTGRES,
    url="postgresql+asyncpg://user:pass@host/db",
    schema="analytics",      # tables live in "analytics" schema
    table_prefix="llm_",     # → analytics.llm_requests, analytics.llm_users ...
)

# MongoDB — schema = database name, prefix = collection prefix
store = StorageManager(
    backend=StorageBackend.MONGO,
    url="mongodb://localhost:27017",
    schema="my_llm_db",
    table_prefix="prod_",    # → prod_requests, prod_sessions ...
)

# Redis — prefix applies to all keys
store = StorageManager(
    backend=StorageBackend.REDIS,
    url="redis://localhost:6379/0",
    table_prefix="myapp:",
)

await store.connect()

Priority: direct args > env vars > defaults

Env Var	Default	Description
LLMCYCLE_STORAGE_BACKEND	—	sqlite / postgres / mysql / mssql / mongo / redis
LLMCYCLE_STORAGE_URL	per-backend default	Connection string
LLMCYCLE_STORAGE_SCHEMA	None	DB schema (Postgres/MSSQL) or DB name (MongoDB)
LLMCYCLE_STORAGE_TABLE_PREFIX	llmc_	Prefix for all tables / collections / keys

Ping — test connectivity

result = await store.ping()
# {"ok": True, "backend": "postgres", "latency_ms": 1.4}
# {"ok": False, "backend": "redis",   "error": "Connection refused"}

CRUD — Users, Teams, Sessions, Requests, History

from llmcycle.storage.models import User, Session, LLMRequest, HistoryMessage

# Users
user = await store.create_user(User(username="alice", email="[e-mail]", role="admin"))
user = await store.get_user(user.id)
user = await store.get_user_by_username("alice")
users = await store.list_users(team_id="team-123")
await store.update_user(user)
await store.delete_user(user.id)

# Sessions
session = await store.create_session(Session(user_id=user.id, model="gpt-4o"))
session.total_requests += 1
await store.update_session(session)
sessions = await store.list_sessions(user_id=user.id, limit=20)

# Requests (auto-logged per LLM call)
req = await store.save_request(LLMRequest(
    model="gpt-4o-mini", provider="openai",
    prompt="What is RAG?",  response="RAG is...",
    prompt_tokens=12, completion_tokens=80,
    latency_ms=340, status="success",
    session_id=session.id, user_id=user.id,
))
requests = await store.list_requests(session_id=session.id)

# History (conversation turns)
await store.append_history(HistoryMessage(session_id=session.id, role="user",      content="Hello"))
await store.append_history(HistoryMessage(session_id=session.id, role="assistant", content="Hi!"))
history = await store.get_history(session.id, limit=100)
await store.clear_history(session.id)

Analytics

import time

yesterday = time.time() - 86400

# Overall summary
stats = await store.analytics.summary(from_ts=yesterday)
# {
#   "total_requests": 1200,
#   "total_tokens": 540000,
#   "avg_latency_ms": 312.4,
#   "p95_latency_ms": 890.2,
#   "error_rate": 0.02,
#   "fallback_rate": 0.05,
# }

# Filter by user / session / provider / model / time range
user_stats = await store.analytics.summary(user_id="u-abc", from_ts=yesterday)

# Breakdown per provider
by_prov = await store.analytics.by_provider(from_ts=yesterday)
# [{"provider": "openai", "requests": 800, "tokens": 380000, "avg_latency_ms": 340, "errors": 4}, ...]

# Breakdown per model
by_model = await store.analytics.by_model()

# Breakdown per user (sorted by token usage)
by_user = await store.analytics.by_user(from_ts=yesterday)

# Breakdown per session
by_session = await store.analytics.by_session(user_id="u-abc")

# Time-series (bucket = "minute" | "hour" | "day")
timeseries = await store.analytics.timeseries(bucket="hour", from_ts=yesterday)
# [{"bucket": "2025-05-22T14:00", "requests": 45, "tokens": 18000, "errors": 1, "avg_latency_ms": 290}, ...]

# Top errors
errors = await store.analytics.top_errors(limit=10)
# [{"error": "Rate limited", "count": 12, "provider": "openai"}, ...]

Purge / Delete by date range

import time

# Delete request logs older than 30 days
thirty_days_ago = time.time() - 30 * 86400
result = await store.purge_by_range(to_ts=thirty_days_ago)
# {"deleted": {"requests": 4820}}

# Delete everything in a specific time window
result = await store.purge_by_range(
    from_ts=1700000000,
    to_ts=1700086400,
    entities=["requests", "history", "sessions"],  # or ["all"]
)
# {"deleted": {"requests": 120, "history": 340, "sessions": 15}}

# Wipe all cached request logs (no time range = all)
result = await store.purge_by_range(entities=["requests"])

Async context manager

async with StorageManager(StorageBackend.SQLITE) as store:
    await store.create_user(User(username="bob"))
    stats = await store.analytics.summary()
    result = await store.ping()
# auto-disconnects on exit

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🧪 Running Tests

# All tests (34 core + 40+ storage)
uv run pytest tests/ -v

# Only storage tests (uses in-memory SQLite — no external DB needed)
uv run pytest tests/test_storage.py -v

# Only core LLM routing tests
uv run pytest tests/test_llmcycle.py -v

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🤝 Contributing

LLMCycle was born from real-world pain. Every feature exists because someone hit a wall in production. We welcome contributions of all kinds — new provider integrations, bug fixes, storage backends, dashboard improvements, or just better documentation.

How to contribute

# 1. Fork & clone
git clone https://github.com/Bishwajitgarai/llmcycle.git
cd llmcycle

# 2. Install in dev mode with all extras
uv sync --group dev
uv add sqlalchemy aiosqlite --dev

# 3. Make your changes
# 4. Run tests — all must pass
uv run pytest tests/ -v

# 5. Open a Pull Request

What we'd love help with

Area	Ideas
New providers	Add any OpenAI-compatible API to providers/registry.py
Storage backends	DynamoDB, Cassandra, ClickHouse
Analytics	Cost estimation, token pricing per model
Dashboard	Charts, export, multi-user auth
Testing	Integration tests for each provider
Docs	Tutorials, deployment guides, video walkthroughs

Contribution guidelines

• Keep PRs focused — one feature or fix per PR
• Add tests for any new functionality
• Follow existing code style (no external formatters required)
• Update README.md if you add a new provider or feature
• Be kind — this is a welcoming community

Found a bug? Have an idea?

Open an issue at github.com/Bishwajitgarai/llmcycle/issues. No template required — just describe what you saw and what you expected.

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👤 Author

Built with ❤️ by Bishwajit Garai

"Stop fighting your LLM infrastructure. Let LLMCycle handle it."

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⭐ If LLMCycle saved you hours, please star the repo — it helps others find it.

⭐ Star on GitHub  ·  📦 PyPI  ·  🐛 Report Bug  ·  💡 Request Feature