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#OpenAI

7 guides~44 min totalupdated Jul 4, 2026

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Which AI Agent Framework Should You Use in 2026?

A developer's decision guide to the best AI agent frameworks in 2026 — three questions to confidently pick LangGraph, CrewAI, the OpenAI or Claude SDK.

Beginner · 9 min

AI Engineering

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IntermediateLLM Structured Outputs: Validated JSON in Python (2026)Get structured outputs from LLMs in Python: validated JSON, not fragile parsing — with Pydantic, OpenAI Structured Outputs, and instructor. Runnable code.4 min BeginnerLLM API Keys: Set Up OpenAI, Anthropic & Gemini (2026)An LLM API key primer: where to get OpenAI, Anthropic, and Gemini keys, how to load one safely with python-dotenv, and how to avoid a leaked-key bill.4 min BeginnerAI Agent Loop in Python: Build a ReAct Agent From ScratchBuild an AI agent loop in Python from scratch: a framework-free ReAct agent that thinks, calls a tool, observes the result, and repeats until the job is done.7 min BeginnerAI Agent Memory in Python: Short-Term Memory From ScratchAdd AI agent memory in Python from scratch: keep the conversation in a messages list, then trim and summarize older turns to fit the model's context window.7 min BeginnerCall an LLM in Python: The First Building Block of an AgentCall an LLM in Python with real OpenAI and Anthropic code: system vs user prompts, temperature, JSON output, and why one call isn't yet an agent.6 min BeginnerTool Calling in Python: Make an LLM Use Your FunctionsTool calling in Python from scratch: define a tool, parse the model's request, run your function, and return the result — with real, current OpenAI code.7 min

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