Jared Zoneraich

OpenAI RL Fine-Tuning: What you need to know and when you should use it

OpenAI dropped Reinforcement Fine-Tuning (RFT) in late 2024, bringing academic RL techniques to everyday developers—one AI researcher called it "RL for the masses." Unlike traditional fine-tuning where models memorize examples, RFT trains models through trial-and-error with rewards, creating a breakthrough moment for developers trying to squeeze better

What we can learn from Anthropic's System prompt updates

Claude's system prompts evolved through dozens of versions in 2024-2025. Each change reveals concrete lessons about production prompt engineering. Find all their system prompts here https://docs.claude.com/en/release-notes/system-prompts Let's read them and see what we can learn! This post extracts the patterns

Code World Model: First Reactions to Meta's Release

Imagine an AI that doesn't just autocomplete your code but actually understands what happens when code runs. That's the revolutionary promise of Code World Models (CWMs) — a new breed of AI that bridges the gap between pattern-matching and true computational reasoning. While traditional code AI learned

AI doesn't kill prod. You do.

I had a conversation with a customer yesterday about how we use AI coding tools. We treat AI tools like they're special, and something to be scared of. Guardrails! Enterprise teams won't try the best coding tools because they are scared of what might happen. AI

Building Agents with Claude Code's SDK

Run Claude Code in headless mode. Use it to build agents that can grep, edit files, and run tests. The Claude Code SDK exposes the same agentic harness that powers Claude Code—Anthropic's AI coding assistant that runs in your terminal. This SDK transforms how developers build AI

GPT-5-Codex: First Reactions

"An AI that can code for 7 hours straight" — VentureBeat's headline on gpt-5-codex. OpenAI dropped GPT-5-Codex in mid-September 2025. Early adopters report game-changing productivity gains alongside some notable quirks. Here's what the community is discovering about OpenAI's latest agentic coding powerhouse, how

How OpenAI Codex Works Behind-the-Scenes (and How It Compares to Claude Code)

Suddenly everyone is switching from Claude Code to OpenAI Codex. I'm not sure which is better (I use both). But it's not just the model. They are made in different ways. The agentic architecture Codex uses will help us understand when to use it, and how

Claude Code has changed how we do engineering

Prioritization is different. Our company has shipped way faster in the last two months. Multiple customers noticed. It helped us build a “Just Do It” culture and kill prioritization paralysis. Claude Code (or OpenAI Codex, Cursor Agents) is an AI coding tool that is so good it made us rethink

Claude Code: Behind-the-scenes of the master agent loop

When Tom's Guide reported that Anthropic had to add weekly limits after users ran Claude Code 24/7, it caused quite a stir. Claude Code did something right. Let's dive into the architecture behind the scenes and see if we can learn a thing or two

OpenAI RL Fine-Tuning: What you need to know and when you should use it

What we can learn from Anthropic's System prompt updates

Code World Model: First Reactions to Meta's Release

AI doesn't kill prod. You do.

Building Agents with Claude Code's SDK

GPT-5-Codex: First Reactions

How OpenAI Codex Works Behind-the-Scenes (and How It Compares to Claude Code)

Claude Code has changed how we do engineering

Claude Code: Behind-the-scenes of the master agent loop

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