agentcost 0.1.6

Track LLM costs across OpenAI, Anthropic, Gemini, LangChain, and 3500+ models with zero code changes

AgentCost SDK

Zero-friction LLM cost tracking for OpenAI, Anthropic, Gemini, and LangChain applications.

AgentCost is an open-source LLM cost observability platform. This is the Python SDK — add two lines to your app and every OpenAI, Anthropic, Gemini, and LangChain call is tracked with model, tokens, cost, and latency, attributed to the agent that made it. Docs: agentcost.tech/docs/sdk

Installation

pip install agentcost

Or install from source:

cd agentcost-sdk
pip install -e .

Quick Start

from agentcost import track_costs

# 2 lines to add cost tracking!
track_costs.init(api_key="your_api_key", project_id="my-project")

# OpenAI — automatically tracked
from openai import OpenAI
client = OpenAI()
response = client.chat.completions.create(model="gpt-4o", messages=[{"role": "user", "content": "Hello!"}])

# Anthropic — automatically tracked
from anthropic import Anthropic
client = Anthropic()
message = client.messages.create(model="claude-3-5-sonnet-20241022", max_tokens=100, messages=[{"role": "user", "content": "Hello!"}])

# Gemini — automatically tracked (Google Gen AI SDK)
from google import genai
client = genai.Client()
response = client.models.generate_content(model="gemini-2.5-flash", contents="Hello!")

# LangChain — automatically tracked
from langchain_openai import ChatOpenAI
llm = ChatOpenAI(model="gpt-4")
response = llm.invoke("Hello!")

Features

• Zero Code Changes: Monkey patches OpenAI, Anthropic, Gemini, and LangChain — your code works as-is
• Automatic Tracking: Captures create() (streaming and not), parse(), the OpenAI Responses API, Anthropic's messages.stream(), and LangChain invoke()/ainvoke()/stream()/astream() — sync and async
• Accurate Tokens: Uses provider-reported usage when available (including Gemini); estimates only when an SDK does not return usage
• Real-Time Costs: Calculates costs using up-to-date model pricing
• Batched Sending: Efficient network usage (size-based + time-based batching)
• Rate Limiting: Built-in rate limiter to protect your backend
• Local Mode: Test without a backend

Configuration

track_costs.init(
    # Required for cloud mode
    api_key="sk_...",
    project_id="my-project",

    # Optional settings
    base_url="https://api.agentcost.tech",   # Your backend URL
    batch_size=10,                          # Events before auto-flush
    flush_interval=5.0,                     # Seconds between flushes
    debug=True,                             # Enable debug logging
    default_agent_name="my-agent",          # Default agent tag
    local_mode=False,                       # Store locally (no backend)
    enabled=True,                           # Enable/disable tracking

    # Custom pricing (overrides defaults)
    custom_pricing={
        "my-custom-model": {"input": 0.001, "output": 0.002}
    },

    # Global metadata (attached to all events)
    global_metadata={
        "environment": "production",
        "version": "1.0.0"
    }
)

Agent Tagging

Tag LLM calls by agent for granular analytics:

# Option 1: Set default agent
track_costs.set_agent_name("router-agent")

# Option 2: Context manager (recommended)
with track_costs.agent("technical-agent"):
    llm.invoke("How do I fix this?")  # Tagged as "technical-agent"

with track_costs.agent("billing-agent"):
    llm.invoke("What's my balance?")  # Tagged as "billing-agent"

Metadata

Attach custom metadata for filtering/grouping:

# Persistent metadata
track_costs.add_metadata("user_id", "user_123")
track_costs.add_metadata("tenant_id", "acme_corp")

# Temporary metadata (context manager)
with track_costs.metadata(conversation_id="conv_456", step="routing"):
    llm.invoke("Route this query")

Local Testing

Test without running a backend:

track_costs.init(local_mode=True, debug=True)

# Make LLM calls
llm.invoke("Hello!")
llm.invoke("World!")

# Retrieve captured events
events = track_costs.get_local_events()
for event in events:
    print(f"Model: {event['model']}")
    print(f"Tokens: {event['total_tokens']}")
    print(f"Cost: ${event['cost']:.6f}")

Streaming Support

Streaming calls are automatically tracked:

# Sync streaming
for chunk in llm.stream("Tell me a story"):
    print(chunk.content, end="")
# Event recorded after stream completes

# Async streaming
async for chunk in llm.astream("Tell me a story"):
    print(chunk.content, end="")
# Event recorded after stream completes

Event Structure

Each tracked event contains:

{
    "agent_name": "my-agent",
    "model": "gpt-4",
    "input_tokens": 150,
    "output_tokens": 80,
    "total_tokens": 230,
    "cost": 0.0093,            # USD, real-time calculated
    "latency_ms": 1234,        # Measured latency
    "timestamp": "2026-01-23T10:30:45.123Z",
    "success": True,
    "error": None,
    "streaming": False,
    "metadata": {"conversation_id": "conv_456"}
}

Dynamic Pricing (Real-Time Updates)

The SDK automatically fetches the latest pricing from the backend. This means:

• No code changes when model prices change
• Pricing is cached for 24 hours (efficient)
• Falls back to built-in defaults if backend is unavailable

How It Works

# SDK automatically fetches pricing from backend
track_costs.init(
    api_key="...",
    project_id="...",
    base_url="http://localhost:8000",  # If running locally
)

# Prices are fetched once and cached
# GET http://localhost:8000/v1/pricing → {"pricing": {"gpt-4": {"input": 0.03, ...}}}

Manually Update Pricing

from agentcost.cost_calculator import refresh_pricing, update_pricing

# Force refresh from backend
refresh_pricing()

# Or manually set pricing (doesn't require backend)
update_pricing({
    "my-custom-model": {"input": 0.001, "output": 0.002}
})

Backend Pricing API

# Get all pricing
curl http://localhost:8000/v1/pricing

# Get specific model
curl http://localhost:8000/v1/pricing/gpt-4

# Update pricing (admin)
curl -X POST http://localhost:8000/v1/pricing \
  -H "Content-Type: application/json" \
  -d '{"gpt-4": {"input": 0.025, "output": 0.05}}'

Pricing Coverage (3500+ models)

Costs are priced for 3500+ models across 45+ providers, synced from the backend and updated automatically when pricing changes.

Pricing coverage is not the same as automatic tracking. Calls are intercepted for the four integrations shown in the Quick Start — OpenAI, Anthropic, Gemini and LangChain (which also covers LangGraph and CrewAI when they run through LangChain). Calling another provider's SDK directly produces no events; route it through LangChain, or report the usage yourself. The table below is what the SDK can put a price on.

Provider	Models
OpenAI	gpt-4, gpt-4-turbo, gpt-4o, gpt-4o-mini, gpt-3.5-turbo, o1, o1-mini
Anthropic	claude-3-opus/sonnet/haiku, claude-3.5-sonnet/haiku, claude-4-opus
Google	gemini-pro, gemini-1.5-pro/flash, gemini-2.0-flash/flash-lite, gemini-2.5-pro/flash/flash-lite, gemini-3-pro-preview
Groq	llama-3.1-8b/70b, llama-3.2-3b, llama-3.3-70b, mixtral-8x7b
DeepSeek	deepseek-chat, deepseek-coder, deepseek-reasoner
Cohere	command, command-light, command-r, command-r-plus
Mistral	mistral-small/medium/large
Together AI	llama-3-70b/8b-chat, meta-llama models
Replicate	Various open-source models
OpenRouter	Aggregated models from multiple providers
Perplexity	pplx models
xAI	Grok models
Amazon	Amazon Nova, Titan models
Azure	Azure OpenAI models
AWS	Bedrock models (Claude, Llama, Mistral)
Anyscale	Anyscale endpoints
Cerebras	Cerebras models
Cloudflare	Workers AI models
Databricks	DBRX, Meta Llama models
DeepInfra	Various hosted models
Fireworks	Fireworks AI models
Hyperbolic	Hyperbolic models
Jina AI	Embedding models
Lambda	Lambda models
MiniMax	MiniMax models
Moonshot	Moonshot models
Sambanova	Samba models
Voyage	Embedding models
IBM	watsonx models
AI21	AI21 Labs models
Aleph Alpha	Aleph Alpha models
Novita	Novita hosted models
Gradient AI	Gradient endpoints
Dashscope	Dashscope models (Alibaba)
Friendliai	Friendliai models
GMI	GMI models
Llamagate	Llamagate models
Morph	Morph models
NLP Cloud	NLP Cloud endpoints
Nscale	Nscale models
Oracle	OCI generative models
OVHCloud	OVHCloud models
Vercel	Vercel AI Gateway, v0 models
Weights & Biases	Wandb models
Zai	Zai models

Note: The full list of 3500+ models is dynamically loaded from the backend. Run track_costs.init() with a valid API key to access all supported models.

Statistics

stats = track_costs.get_stats()
print(f"Events sent: {stats['batcher']['events_sent']}")
print(f"Batches sent: {stats['batcher']['batches_sent']}")

Graceful Shutdown

track_costs.flush()     # Send pending events
track_costs.shutdown()  # Full shutdown

License

MIT License