GPT 5.6 Luna Just Got 80% Cheaper: Do This Now

Lo que necesitas

• A ChatGPT subscription with access to GPT 5.6 Sol and Luna

• ChatGPT Work or Codex (chatgpt.com/codex)

• A project to apply the subagent setting to

Paso a paso

1. 1

   Understand what changed

   0:02

   GPT 5.6 Luna is now 80% cheaper. That makes it the second cheapest model at its level of intelligence, which I put alongside GLM 5.2, Opus 5 and Gemini 3.6. Your ChatGPT subscription now gets you more work for the same money.

2. 2

   Look at the benchmarks

   0:34

   In the benchmarks shown, Luna scores about the same as DeepSeek V4 Pro across the board. It also runs about three times faster (tokens per second) and costs far less. Treat that as a reason to try Luna, not as a reason to use it for everything.

3. 3

   Decide when to use Sol and when to use Luna

   1:12

   Think of the models as different people. Sol has the most intelligence and taste. Luna is strong at execution and matches Sol on small, easy tasks. Give Luna simple work, even when it is long. Keep harder, longer tasks on Sol.

4. 4

   Keep design and UX on Sol

   2:11

   Luna is still weaker than Sol at design and UX. If you are building your own app or vibe coding, use Sol.

5. 5

   Use Sol as your main model with Luna subagents

   2:28

   Here is the setup that gets you the most for your money: keep 5.6 Sol as your main model and let it send work to Luna subagents running with fast mode and the highest reasoning setting.

6. 6

   Send the setup prompt in ChatGPT Work or Codex

   2:53

   Open ChatGPT Work or Codex inside your project. Paste this prompt and send it, then wait for the reply.

   Setup promptCopiar

   Hey ChatGPT, whenever you work with subagents, I want you to run them as Luna agents with the highest reasoning setting possible and fast mode. Can you set that up for me in this project?

7. 7

   Choose where the setting applies

   3:32

   You can apply this to one project, or repeat it for every project you have. Choose based on how you work.

8. 8

   Check the setup and ask for Max reasoning

   3:55

   Read the reply and check that everything you asked for is set up. Luna has a Max reasoning mode, but the settings menu for 5.6 Luna only goes up to Extra High. Ask for Max directly so your subagents run at full reasoning.

   Ask for Max modeCopiar

   For the Luna subagents, I need the max mode of reasoning plus fast mode.

Qué ver después

• 26:07Master Codex Desktop in 30 MinutesLearn the Codex features around your Sol and Luna setup, like AGENTS.md, subagents and goals.
• 7:01Make Claude Fable 5 Use GPT 5.6 Sol: Here's HowApply the same planner and worker split inside Claude Code, with GPT 5.6 Sol doing tasks.