Early this morning, I saw the news that GPT 5.6 had launched last night and that Codex and ChatGPT were being combined.
The GPT 5.6 announcement made sense to me. But I did not quite understand what it meant for Codex and ChatGPT to become one.
So I opened Codex, updated it, and got ready to try GPT 5.6. Codex updates almost every day, so I was not expecting anything unusual. But after updating, I noticed that the Codex icon had changed and the app was now called ChatGPT. Looking more closely, I found it had gained quite a few capabilities compared with the old Codex.
- Chat: The web version of ChatGPT is now integrated into the app, including my existing ChatGPT conversation history.
- Code editing: It is no longer limited to previewing code; you can now edit code manually. It is a small change, but genuinely convenient.
As for GPT 5.6, I have been using it throughout the day, and it is noticeably better than 5.5—both for coding and for other work.
GPT 5.6 now comes in three variants: Luna, Terra, and Sol. I have used all three quite a bit today. My impression is that Luna is better suited to automation tasks, Terra to everyday work and development, and Sol to more complex work and development.
独立产品人日记
Notes on indie products, AI tools, growth, and engineering.
Related Articles
Gemini: The King Is Back?
After falling behind for nearly a year, Gemini has suddenly made waves: the Gemini 4 leak, Claude 5.5 integration in Antigravity, and Google tightening access to its Gemini models. For free users, Gemini is basically an enhanced search engine.
Token Plan: A Black Box, and a Good Business
Token is becoming another everyday utility after water, electricity, coal, and cloud computing. Cloud providers are rolling out seemingly cheap Token Plans, but in real-world use, ChatGPT and Claude subscriptions turn out to be the better deal. And many Token Plans are a black box — priced in credits, with a conversion ratio only the vendor knows, one they can change at will.
DeepSeek Harness Is More Than an Agent
Hands-on with DeepSeek Harness: after comparing it with Claude Code, DeepSeek's own Agent paired with its own model just works better. It's not just an Agent tool — it's open source and can be fully customized into dedicated Agent products.