pydantic-ai-slim
AI Agent Framework, the Pydantic way, slim package
Decision gist · record as of 2026-08-14
Yes, if you are building an AI agent application and already use Pydantic or want structured, type-safe interactions. The low install friction, active maintenance, permissive MIT license, and zero known vulnerabilities make it a safe choice. Consider the full distribution if you need provider integrations or advanced tooling beyond core agent logic.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Depends on pydantic, httpx, anyio, and opentelemetry-api among nine runtime packages.
- Low friction install with a pure Python wheel.
License · maintenance · safety
MIT (permissive) — MIT license permits commercial and private use with minimal restrictions—you may use, modify, and distribute this package freely provided you include the license notice.
last release 2026-08-13 (1 days) · last repo commit 2026-08-14 · 19,277 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 154,618,422 downloads/mo, #262 on PyPI
Alternatives
Verify before relying
pip install pydantic-ai-slim
import pydantic_ai_slim
# Core agent framework available via runtime dependencies- What specific agent patterns and workflows the slim variant supports versus the full distribution
- Whether AI provider integration requires additional configuration or credentials beyond the framework
- Performance characteristics and latency compared to direct provider SDKs
- How the slim variant differs functionally from the full pydantic-ai package
What it is and what it does
Pydantic AI Slim is a lightweight distribution of the Pydantic AI agent framework, designed for developers who want to build AI-powered applications using Pydantic's validation and serialization but don't need the full package's optional dependencies. It provides core agent logic with a minimal footprint, integrating with Pydantic's type system to ensure type-safe interactions. The framework uses httpx for HTTP communication and includes observability via opentelemetry-api.
The package is actively maintained and widely used (top 1000 on PyPI), with support for modern Python versions (3.10–3.14). It depends on nine runtime packages including pydantic, httpx, anyio, opentelemetry-api, genai-prices, griffelib, pydantic-graph, exceptiongroup, and typing-inspection. The slim variant is intended for projects that want the agent framework without pulling in optional integrations, making it suitable for custom or minimal deployments.
Use it for
- Build a conversational agent that validates and structures responses using Pydantic models
- Create a multi-step AI workflow where each step's input and output are type-checked
- Integrate AI capabilities into an existing Pydantic-based application with minimal new dependencies
- Prototype an agent framework without committing to a full-featured distribution
- Deploy AI agents in resource-constrained environments where dependency footprint matters
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are building an AI agent application and already use Pydantic or want structured, type-safe interactions.
The low install friction, active maintenance, permissive MIT license, and zero known vulnerabilities make it a safe choice. Consider the full distribution if you need provider integrations or advanced tooling beyond core agent logic.
Install
pydantic-ai-slim on PyPI
Before you install
Low friction install with a pure Python wheel. Active maintenance with a recent release (1 day old) and strong community backing (19277 stars). Supports Python 3.10 through 3.14.
Requires Python 3.10 or later. Depends on pydantic, httpx, anyio, and opentelemetry-api among nine runtime packages.
License in practice
MIT license permits commercial and private use with minimal restrictions—you may use, modify, and distribute this package freely provided you include the license notice.
Quickstart
pip install pydantic-ai-slim
import pydantic_ai_slim
# Core agent framework available via runtime dependenciesVerify before relying
- What specific agent patterns and workflows the slim variant supports versus the full distribution
- Whether AI provider integration requires additional configuration or credentials beyond the framework
- Performance characteristics and latency compared to direct provider SDKs
- How the slim variant differs functionally from the full pydantic-ai package
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 9 packagesanyioexceptiongroupgenai-pricesgriffelibhttpxopentelemetry-apipydantic-graphpydantictyping-inspection |
| Maintenance | Actively maintained 1 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 154,618,422 / month, #262 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableEnvironment :: ConsoleEnvironment :: MacOS XIntended Audience :: DevelopersIntended Audience :: Information TechnologyIntended Audience :: System AdministratorsLicense :: OSI Approved :: MIT LicenseOperating System :: POSIX :: LinuxOperating System :: UnixProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: InternetTopic :: Software Development :: Libraries :: Python Modules |
Evidence: pydantic_ai_slim-2.29.0-py3-none-any.whl
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See also pydantic-ai · pydantic-ai-harness · pydantic-ai-todo · summarization-pydantic-ai · pydantic-ai-skills · pydantic-tes · pydantic-deep · pydantic-graph · fastapi-slim · pydantic-ai-absurd