Topics / #pydantic

Pydantic projects on GitHub

Python library for data validation and settings management using type annotations.

As of , the most-starred Pydantic projects on GitHub are langchain (148K stars), fastapi (103.2K stars) and langgraph (43.4K stars). GitHub.Locker tracks 12 Pydantic repositories with 404.3K stars combined. The fastest-growing on October 17 was langchain, with +59 stars in a day.

12Projects
404.3KStars in total
+215Stars in a day
Browse in the catalog →github.com/topics/pydantic ↗

Hot right now

Most stars gained in a day · Oct 17

+59

langchain

langchain-ai/langchain · ★ 148K

LangChain is a framework for building agents and LLM-powered applications: it chains together interoperable components and third-party integrations to simplify AI app development.

+49

langgraph

langchain-ai/langgraph · ★ 43.4K

LangGraph is a low-level orchestration framework for building, managing, and deploying long-running, stateful AI agents — workflows where an agent keeps state across steps, failures, and even sessions.

+38

fastapi

fastapi/fastapi · ★ 103.2K

FastAPI is a modern Python web framework for building APIs using standard Python type hints, with automatic data validation and interactive documentation.

+25

pydantic-ai

pydantic/pydantic-ai · ★ 20.7K

Pydantic AI is the Python AI SDK for building agents: a typed, extensible agent loop where every model is a string swap away. The same agent runs behind a web frontend, in the terminal, on a voice call, or as a plain object you call run() on.

The all-time top

12 projects · by stars

  1. #1 · langchain-ai/langchain

    langchain

    LangChain is a framework for building agents and LLM-powered applications: it chains together interoperable components and third-party integrations to simplify AI app development.

    148K
  2. #2 · fastapi/fastapi

    fastapi

    FastAPI is a modern Python web framework for building APIs using standard Python type hints, with automatic data validation and interactive documentation.

    103.2K
  3. #3 · langchain-ai/langgraph

    langgraph

    LangGraph is a low-level orchestration framework for building, managing, and deploying long-running, stateful AI agents — workflows where an agent keeps state across steps, failures, and even sessions.

    43.4K
  1. 4

    pydantic

    29.1Kpydantic/pydantic · Python

    Pydantic is a Python library for data validation: you describe the data you expect with plain Python type hints, and it validates and parses real data against that description.

  2. 5

    pydantic-ai

    20.7Kpydantic/pydantic-ai · Python

    Pydantic AI is the Python AI SDK for building agents: a typed, extensible agent loop where every model is a string swap away. The same agent runs behind a web frontend, in the terminal, on a voice call, or as a plain object you call run() on.

  3. 6

    sqlmodel

    18.4Kfastapi/sqlmodel · Python

    SQLModel is a Python library for interacting with SQL databases using Python objects instead of raw SQL. It is built on Pydantic and SQLAlchemy and designed for simplicity, compatibility, and robustness.

  4. 7

    fastapi-best-practices

    18.2Kzhanymkanov/fastapi-best-practices

    A curated collection of best practices and conventions for building FastAPI applications, based on lessons learned building production systems at a startup.

  5. 8

    instructor

    14K567-labs/instructor · Python

    Instructor is a Python library that gets reliable structured JSON output from LLMs by defining Pydantic models instead of hand-writing JSON schemas and parsing logic.

  6. 9

    cascadeflow

    3.9Klemony-ai/cascadeflow · Python

    An open-source in-process intelligence layer (cascading runtime) for AI agents: it sits inside the agent execution loop and optimizes every model call for cost, latency, quality, budget, compliance, and energy.

  7. 10

    ai-agents-the-definitive-guide

    2.8KNicolepcx/ai-agents-the-definitive-guide · Jupyter Notebook

    It is the companion code repository for the book 'AI Agents - The Definitive Guide': a set of runnable Jupyter notebooks that walk through every chapter, from basic agent patterns to production deployment and threat modeling.

  8. 11

    capcut-mate

    2KHommy-master/capcut-mate · Python

    CapCut Mate API is an open-source FastAPI service that automates CapCut/Jianying video editing drafts, letting you create drafts, add materials, and render final videos programmatically or from an LLM.

  9. 12

    polyledger

    599nahrek/polyledger · Python

    PolyLedger is a resumable indexer that pulls Polymarket's market metadata from the CLOB API and every on-chain OrderFilled trade from Polygon, writing both into a single DuckDB file you can query with plain SQL.

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