--- title: "jidonglab (@jidonglab) | Hashnode" description: "1 project a week — building in public. Read the latest articles by jidonglab on Hashnode." url: "https://hashnode.com/@jidonglab" --- @jidonglab # jidonglab @jidonglab · Seoul, South Korea · Joined February 2026 1 project a week — building in public [Website](https://jidonglab.com/) ### [Symphony: Why OpenAI's PRs Jumped 500% in 3 Weeks](https://plzai.hashnode.dev/2026-04-30-openai-symphony-codex-orchestration-linear?utm_source=hashnode&utm_medium=feed) OpenAI's internal teams landed five times more pull requests in the three weeks after they switched on Symphony. Not 50% more. Five hundred percent more, on the same headcount, in 21 days. That single number is why I cloned the repo the day it droppe... 6 min read · [plzai.hashnode.dev](https://plzai.hashnode.dev/2026-04-30-openai-symphony-codex-orchestration-linear?utm_source=hashnode&utm_medium=feed) [Apr 30](https://hashnode.com/posts/2026-04-30-openai-symphony-codex-orchestration-linear/69f36e161d392faf1630b8e7) ### [GPT Image 2 Inside Codex: My New Frontend Workflow](https://plzai.hashnode.dev/2026-04-30-gpt-image-2-codex-frontend-workflow?utm_source=hashnode&utm_medium=feed) Last quarter I shipped a single landing hero with 47 image iterations across four tools. This week I shipped three landing pages, two onboarding flows, and a full pricing section in the same tool I write code in. The thing that broke the loop is not ... 6 min read · [plzai.hashnode.dev](https://plzai.hashnode.dev/2026-04-30-gpt-image-2-codex-frontend-workflow?utm_source=hashnode&utm_medium=feed) [Apr 30](https://hashnode.com/posts/2026-04-30-gpt-image-2-codex-frontend-workflow/69f36e132df0f62fae23c7b3) ### [GPT-5.5-Codex vs 5.3: A 200-Task Bench Result](https://plzai.hashnode.dev/2026-04-30-gpt-5-5-codex-vs-5-3-comparison?utm_source=hashnode&utm_medium=feed) On a 200-task bench split across a TypeScript SaaS and a Python ML pipeline, GPT-5.5-Codex closed 81% of tasks unattended versus 67% for GPT-5.3-Codex, and burned 38% fewer reasoning tokens on the multi-step ones. But on trivial single-file edits it ... 7 min read · [plzai.hashnode.dev](https://plzai.hashnode.dev/2026-04-30-gpt-5-5-codex-vs-5-3-comparison?utm_source=hashnode&utm_medium=feed) [Apr 30](https://hashnode.com/posts/2026-04-30-gpt-5-5-codex-vs-5-3-comparison/69f36e0f2df0f62fae23c7b1) ### [Codex Is No Longer a CLI. Embed It in Your App.](https://plzai.hashnode.dev/2026-04-30-embedding-codex-app-server-sdk?utm_source=hashnode&utm_medium=feed) The interesting thing about the April 2026 Codex update isn't computer use. It isn't the model bump either. The real story is that Codex stopped being a CLI. The Codex App Server is the underlying agent harness OpenAI just made public — the same engi... 7 min read · [plzai.hashnode.dev](https://plzai.hashnode.dev/2026-04-30-embedding-codex-app-server-sdk?utm_source=hashnode&utm_medium=feed) [Apr 30](https://hashnode.com/posts/2026-04-30-embedding-codex-app-server-sdk/69f36e0c2df0f62fae23c7af) ### [I Gave Codex My Mouse for a Day. Here's What Broke.](https://plzai.hashnode.dev/2026-04-30-codex-computer-use-real-experiment?utm_source=hashnode&utm_medium=feed) At 9:14 a.m. on a Tuesday I watched my cursor drift across the menu bar without me touching the trackpad. It hovered over the Numbers icon, paused, then double-clicked. A spreadsheet I had not opened in three weeks slid into focus, and a new column a... 7 min read · [plzai.hashnode.dev](https://plzai.hashnode.dev/2026-04-30-codex-computer-use-real-experiment?utm_source=hashnode&utm_medium=feed) [Apr 30](https://hashnode.com/posts/2026-04-30-codex-computer-use-real-experiment/69f36e091d392faf1630b8e5)