letta-client
The official Python library for the letta API
Decision gist · record as of 2026-08-14
Yes. The package is actively maintained, has no known vulnerabilities, uses a permissive license, and provides a clean, type-safe interface to the Letta API. Install it if you need to programmatically interact with Letta agents or archives from Python. The low install friction and support for both sync and async patterns make it suitable for most Python projects.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.9 or later; LETTA_API_KEY environment variable or explicit api_key parameter needed for authentication.
- Low friction install with six common runtime dependencies.
- The package is actively maintained with a recent release (73 days ago) and no known vulnerabilities.
License · maintenance · safety
Apache-2.0 (permissive) — Apache-2.0 permissive license allows use in most commercial and open-source projects without significant restrictions.
last release 2026-06-02 (73 days) · last repo commit 2026-07-07 · 55 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 120,263 downloads/mo, #12,039 on PyPI
Alternatives
Verify before relying
pip install letta-client
import os
from letta_client import Letta
client = Letta(
api_key=os.environ.get("LETTA_API_KEY"),
environment="local",
)
archive = client.archives.create(name="name")
print(archive.id)- Whether the Letta service itself (not just this client) is production-ready and suitable for your use case.
- Performance characteristics and rate limits of the underlying Letta REST API.
- Whether aiohttp backend (optional dependency) provides measurable concurrency improvements for your workload.
What it is and what it does
Letta-client is the official Python SDK for the Letta REST API, generated using Stainless. It wraps HTTP communication with full type safety via Pydantic models and TypedDicts, offering both synchronous and asynchronous clients powered by httpx. The library handles pagination automatically, supports streaming responses via Server-Side Events, and provides structured error handling with specific exception types for different HTTP status codes.
You use it to build Python applications that interact with Letta agents and archives. The client manages authentication via API keys, serialization and deserialization of requests and responses, and offers optional aiohttp support for improved async concurrency. It supports Python 3.9 through 3.14 and is cross-platform (macOS, Windows, Linux).
Use it for
- Build a chatbot or conversational agent application that delegates message handling to Letta's managed agent infrastructure.
- Automate archive management (creation, querying, updates) as part of a larger data pipeline or knowledge management system.
- Develop an async service that streams agent responses in real-time to multiple concurrent clients using the AsyncLetta client.
- Integrate Letta agent capabilities into an existing Python web framework by using the typed client for type-checked API calls.
- Paginate through large lists of agents or archives without manually handling page cursors or making repeated requests.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
The package is actively maintained, has no known vulnerabilities, uses a permissive license, and provides a clean, type-safe interface to the Letta API. Install it if you need to programmatically interact with Letta agents or archives from Python. The low install friction and support for both sync and async patterns make it suitable for most Python projects.
Install
letta-client on PyPI
Before you install
Low friction install with six common runtime dependencies. The package is actively maintained with a recent release (73 days ago) and no known vulnerabilities.
Requires Python 3.9 or later; LETTA_API_KEY environment variable or explicit api_key parameter needed for authentication.
License in practice
Apache-2.0 permissive license allows use in most commercial and open-source projects without significant restrictions.
Quickstart
pip install letta-client
import os
from letta_client import Letta
client = Letta(
api_key=os.environ.get("LETTA_API_KEY"),
environment="local",
)
archive = client.archives.create(name="name")
print(archive.id)Verify before relying
- Whether the Letta service itself (not just this client) is production-ready and suitable for your use case.
- Performance characteristics and rate limits of the underlying Letta REST API.
- Whether aiohttp backend (optional dependency) provides measurable concurrency improvements for your workload.
Package facts
| License | Apache-2.0 permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 6 packagesanyiodistrohttpxpydanticsniffiotyping-extensions |
| Maintenance | Actively maintained 73 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 120,263 / month, #12,039 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Intended Audience :: DevelopersLicense :: OSI Approved :: Apache Software LicenseOperating System :: MacOSOperating System :: Microsoft :: WindowsOperating System :: OS IndependentOperating System :: POSIXOperating System :: POSIX :: LinuxProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.9Topic :: Software Development :: Libraries :: Python ModulesTyping :: Typed |
Evidence: letta_client-1.12.1-py3-none-any.whl
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