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How to Use GPT-5.3-Codex for Self-Improving Code: Recursive AI Development Patterns and Practical Implementation
ByMarkos Symeonides July 7, 2026October 11, 2026 Reading Time: 23 minutes

GPT-5.3-Codex is the newest installment in OpenAI’s code-focused family, designed to reason faster and act more reliably across large, real-world codebases. In this in-depth tutorial, we explore how to set it up, orchestrate recursive self-improvement loops, and safely deploy practical patterns—automated refactoring, test-driven self-optimization, performance profiling with auto-fixes, and documentation…

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OpenAI Deprecates the Assistants API: What Developers Need to Know Before the August 2026 Shutdown
ByMarkos Symeonides July 7, 2026October 12, 2026 Reading Time: 21 minutes

OpenAI has formally announced the deprecation and end-of-life of the Assistants API, with a full shutdown slated for August 26, 2026. Here’s the comprehensive briefing developers, product leaders, and enterprise platform teams need to navigate the transition to the Responses API. Table of Contents What Changed: The Official Announcement and…

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Inside A YC Startup: How They Shipped Internal Tool Using AI Coding Agents
ByMarkos Symeonides July 7, 2026October 11, 2026 Reading Time: 10 minutes

⚡ TL;DR — Key Takeaways What it is: A detailed case study of a YC S24 startup that shipped a production-grade internal Revenue Ops Console in 8 days using AI coding agents orchestrating models like gpt-5.4-pro and claude-opus-4.7. Who it’s for: Founders, CTOs, and engineering leads at early-stage startups looking…

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The Complete Prompt Engineering Stack for 2026: 20 Tools Evaluated
ByMarkos Symeonides July 7, 2026October 11, 2026 Reading Time: 11 minutes

The Complete Prompt Engineering Stack for 2026 — 20 Tools Evaluated & Production Playbook ⚡ TL;DR — Key Takeaways What this guide is: A practical playbook and vendor-mapped evaluation of 20 prompt engineering tools covering the six core stack layers (authoring, orchestration, retrieval, evaluation, monitoring, governance) and concrete production patterns…

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How to Build a an AI Agent with GPT-5.4 in 2026: Step-by-Step
ByMarkos Symeonides July 7, 2026October 12, 2026 Reading Time: 10 minutes

Build a Production AI Agent with GPT-5.4 (2026) — Step-by-Step Guide ⚡ TL;DR — Key Takeaways What this is: A practical, production-focused walkthrough to design, implement, test, and deploy a resilient AI research agent using GPT-5.4’s agent-native features in 2026. Who it’s for: Senior engineers, ML engineers, and engineering managers…

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Inside The Platform Team: How They Shipped Internal Tool Using AI Coding Agents
ByMarkos Symeonides July 7, 2026October 11, 2026 Reading Time: 11 minutes

⚡ TL;DR — Key Takeaways What it is: A detailed case study of how an 8-person platform team rebuilt their internal deployment tool using AI coding agents (gpt-5.5, claude-opus-4.7) to cut cycle time from 10 weeks to 10 days. Who it’s for: Engineering leaders, platform engineers, and DevEx teams evaluating…

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Best ChatGPT Prompts for coding
ByMarkos Symeonides July 7, 2026October 11, 2026 Reading Time: 10 minutes

Best ChatGPT Prompts for Coding: The 2026 Playbook to Ship Reliable, Audit‑Ready AI Code ⚡ TL;DR — Key Takeaways What this is: A production-focused reference of high-performance ChatGPT (and similar model) prompts for real engineering teams in 2026. Who it’s for: Software engineers, tech leads, SREs, security reviewers, and platform…

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20 Battle-Tested Prompts for product managers in 2026
ByMarkos Symeonides July 7, 2026October 12, 2026 Reading Time: 15 minutes

20 Battle-Tested Prompts for Product Managers in 2026 — The Practical Prompt Library & Adoption Playbook ⚡ TL;DR — Key Takeaways What it is: A curated library of 20 battle-tested LLM prompts designed specifically for product managers, covering PRDs, user research, roadmap prioritization, competitive analysis, and stakeholder communication. Who it’s…

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Setting Up Gemini 3.1 Pro for Enterprise Deployments — Complete Developer Walkthrough
ByMarkos Symeonides July 7, 2026October 11, 2026 Reading Time: 12 minutes

⚡ TL;DR — Key Takeaways What it is: A production-grade, enterprise-focused developer walkthrough for deploying Gemini 3.1 Pro on Vertex AI, covering IAM, regional endpoints, quota management, structured outputs, grounding, prompt caching, observability, and migration from GPT-5.5 or Claude Opus 4.7. Who it’s for: Enterprise platform and SRE teams moving…

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Claude Sonnet 4.6 vs Claude Code: The 2026 Head-to-Head Comparison
ByMarkos Symeonides July 7, 2026October 11, 2026 Reading Time: 11 minutes

Claude Sonnet 4.6 vs Claude Code: The Definitive 2026 Head-to-Head for Developers ⚡ TL;DR — Key Takeaways What it is: A technical comparison of Claude Sonnet 4.6 (a raw API model) versus Claude Code (an autonomous terminal agent) to help teams select the right strategy for coding, migrations, and production…

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