Posts

Build Hour: Built-In Tools

Build Hour: Built-In Tools

Built-in tools like web search, file search, and code interpreter allow developers to extend model capabilities out-of-the-box. This summary covers the concepts, compares them to function calling, and details a demo of building a data exploration dashboard using multiple tools in concert.

Build Hour: Voice Agents

Build Hour: Voice Agents

A deep dive into building sophisticated voice agents using OpenAI's Realtime API and Agents SDK. The session covers architectural patterns like chained vs. end-to-end models, the use of multi-agent systems with handoffs for specialized tasks, and best practices for production including debugging with traces, implementing guardrails, and creating robust evaluations.

Build Hour: Reinforcement Fine-Tuning

Build Hour: Reinforcement Fine-Tuning

A deep dive into Reinforcement Fine-Tuning (RFT), covering how to set up tasks, design effective graders, and run efficient training loops to improve model reasoning, based on a live demonstration from OpenAI's Build Hours.

Build Hour: Agentic Tool Calling

Build Hour: Agentic Tool Calling

A deep dive into building agentic systems using OpenAI's latest APIs. The session covers the core concept of 'agentic tool calling' (reasoning + tools), outlines a four-part framework (Agent, Infrastructure, Product, Evaluation) for designing long-horizon tasks, and provides a hands-on demonstration of building a non-blocking task processing system with a real-time progress UI.

Substack Cofounder on the Internet's Content Problem

Substack Cofounder on the Internet's Content Problem

Chris Best, cofounder and CEO of Substack, joins a16z to discuss the platform's origin, its cultural impact on free speech and media business models, and its evolution from a newsletter tool to a full-fledged creator network. The conversation explores the future of media in an attention-scarce world, the role of AI in content creation, and how rethinking algorithms and incentives can build a healthier cultural ecosystem.

The future of agentic coding with Claude Code

The future of agentic coding with Claude Code

Anthropic's Boris Cherny, creator of Claude Code, discusses the paradigm shift from traditional coding to agentic workflows. He covers the co-evolution of models and their "harnesses," the importance of "hackability" via features like slash commands, and provides practical tips for leveraging coding agents for tasks of varying complexity.