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Should we rebuild T3 Code in Swift? I have a Codex reset that expires tomorrow so I threw gpt-5.6-sol ultra at it. It did surprisingly well. Only took about 20% of my weekly limit!

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Theo - t3.gg

368,980 subscribers

124,726 views • 4 days ago •via X (Twitter)

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Codex users: here's an amazing way to take advantage of the efficiency and capability of GPT-5.6 Luna Max. It's called 'sol-advisor'. 1. GPT-5.6 Sol High as orchestrator 2. GPT-5.6 Luna Max as implementer for routine tasks 3. GPT-5.6 Terra Max as implementer for complex tasks 4. Fresh GPT-5.6 Sol instance as reviewer A free and open-source plugin for Codex. Installation instructions below 👇 I dare you to install it, and tell me if you hit your weekly usage limits using 'sol-advisor'. I doubt you can.

Dan McAteer

625,056 views • 2 days ago

GPT 5.6 Sol in Codex just one-shot this... It made a mascot for my app, then generated ~30 variations of the mascot representing my app’s top use cases. I was so blown away, I had to share it:
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GPT 5.6 Sol in Codex just one-shot this... It made a mascot for my app, then generated ~30 variations of the mascot representing my app’s top use cases. I was so blown away, I had to share it:

Jarrod Watts

17,632 views • 11 days ago

I was wrong about Kimi K3 Just tried it in Claude Code and it is Fable 5 level for sure Far better than GPT-5.6 Sol at least at front-end It is really slow and consumes a lot of tokens but it is so good at completing its task, I like what I see here Kimi.ai
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258,366 views • 18 days ago

wow... GPT 5.6 Sol Passed the Replit Benchmark. In one prompt 5.6 on Codex created a full Replit clone with DB, Sandboxes, and an agent that builds and edits full web apps. Only Fable and GPT 5.6 have passed this benchmark. 5.6 is much better at designing iOS apps than 5.5 as well.
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wow... GPT 5.6 Sol Passed the Replit Benchmark. In one prompt 5.6 on Codex created a full Replit clone with DB, Sandboxes, and an agent that builds and edits full web apps. Only Fable and GPT 5.6 have passed this benchmark. 5.6 is much better at designing iOS apps than 5.5 as well.

Riley Brown

123,242 views • 26 days ago

When GPT-5 came out, I created a procedural brutalist city builder as a demo (you can see it in the quoted tweet) I used GPT-5.6 Sol in Codex to do the same thing, touching no code. Less than a year... Play with it (its fun, if you like cities):
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When GPT-5 came out, I created a procedural brutalist city builder as a demo (you can see it in the quoted tweet) I used GPT-5.6 Sol in Codex to do the same thing, touching no code. Less than a year... Play with it (its fun, if you like cities):

Ethan Mollick

186,463 views • 25 days ago

Okay, I took a look at what Codex did in that time: Don't know what to think about it lol
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Okay, I took a look at what Codex did in that time: Don't know what to think about it lol

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18,735 views • 2 months ago

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57,544 views • 22 days ago

T3 Code is here. I shot a short video about why we built it and why I'm so excited.
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41,571 views • 5 months ago

GPT 5.6 Sol is so good web design it actually broke our evals 🥲 took creative liberties like a supapro web designer that took us off guard. in a few prompts, it was able to remix a slurped brand from an URL and Sol lit up 🌞❤️‍🔥
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GPT 5.6 Sol is so good web design it actually broke our evals 🥲 took creative liberties like a supapro web designer that took us off guard. in a few prompts, it was able to remix a slurped brand from an URL and Sol lit up 🌞❤️‍🔥

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People still using Cursor/Codex/VSCode to code?! I don't get it... I know we used to call it "vibe coding" Today, I call it professional product engineering. Done staring at code in an editor, we're way pass that. This is how you should do it in 2026 👇

Simon Høiberg

16,123 views • 1 month ago

GPT-5.6 Sol Ultra lost to GPT-5.5 on physics at 3× the cost! We gave 4 models the same prompt: build three self-contained HTML5 canvas scenes with real physics demos Prompts: - A monster truck backflipping onto a parked car - A stunt car jumping six buses into a brick wall - A train derailing off a broken bridge into the water Outputs: GPT-5.6 Sol Ultra: 32.9K tokens, $0.33 Opus 4.8: 9.2K tokens, $0.24 GPT-5.5: 12.4K tokens, $0.11 Grok 4.5: 7.0K tokens, $0.08 Sol Ultra draws just like GPT-5.5, only with more detail and it shows clearest on the bus jump where the two look almost identical. In the other tests Sol Ultra came out worse than its predecessor and the physics really got weaker. We think GPT-5.5 took the truck flip and the train outright. With Sol Ultra you basically get GPT-5.5 with weaker physics and a nicer picture for 3x the price. Newborn Grok 4.5 failed two of the three tests and only came good on the train
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atomic.chat

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We are officially in the era where one prompt can ship a complete playable game in <50 bucks! Asked Claude Fable 5 and GPT 5.6 Sol to clone Terraria, max effort level Both are playable and offer a smooth experience GPT 5.6 Sol did it at roughly 1/4 the cost and in 2/3 the runtime: - GPT 5.6 Sol: ~$35, ~1h 20m - Claude Fable 5: ~$120, ~2h Tho Fable still produced the strongest results 🥲
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We are officially in the era where one prompt can ship a complete playable game in <50 bucks! Asked Claude Fable 5 and GPT 5.6 Sol to clone Terraria, max effort level Both are playable and offer a smooth experience GPT 5.6 Sol did it at roughly 1/4 the cost and in 2/3 the runtime: - GPT 5.6 Sol: ~$35, ~1h 20m - Claude Fable 5: ~$120, ~2h Tho Fable still produced the strongest results 🥲

GMI Cloud

127,195 views • 25 days ago

So did I go about this the right way or should I have just minded my own business’ That was pretty dangerous on my part now that I think about it
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So did I go about this the right way or should I have just minded my own business’ That was pretty dangerous on my part now that I think about it

Rofl fights

33,745 views • 10 months ago

Whole day with Pi agent just used 10% of my $20 Codex weekly quota All gpt 5.5, various thinking levels I'm now 3 hours away from weekly reset and still have 42% left! For my typical 4-6h/day session: Codex Desktop - 20-30% a day, 1-2 days/week Pi - 10% a day, 4-5 days/week? My switch to Pi is really looking good so far
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Whole day with Pi agent just used 10% of my $20 Codex weekly quota All gpt 5.5, various thinking levels I'm now 3 hours away from weekly reset and still have 42% left! For my typical 4-6h/day session: Codex Desktop - 20-30% a day, 1-2 days/week Pi - 10% a day, 4-5 days/week? My switch to Pi is really looking good so far

raymel 👋

153,436 views • 2 months ago

I asked the new GPT 5.6 Sol Ultra vs Fable XHigh to "create an app to compare the fastest growing stocks in diff time periods" Here are the results. I then asked both to create a comparison video. Sol couldn't do it, so here's what Fable made. Check out how they compare!
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I asked the new GPT 5.6 Sol Ultra vs Fable XHigh to "create an app to compare the fastest growing stocks in diff time periods" Here are the results. I then asked both to create a comparison video. Sol couldn't do it, so here's what Fable made. Check out how they compare!

Deedy

86,029 views • 24 days ago

ok I have it the first "Talk to your PDF" app that actually doesn't suck it only cost me 50% of the weekly 100$ Codex sub and a few prompts of Fable to fix the frontend it's fast, it works and I love it
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ok I have it the first "Talk to your PDF" app that actually doesn't suck it only cost me 50% of the weekly 100$ Codex sub and a few prompts of Fable to fix the frontend it's fast, it works and I love it

Mihura

84,767 views • 9 days ago

I tried this so you don't have to. I know this is going to absolutely shock you but no this does not match the performance of Mythos. A few early thoughts: 1. The limits are pretty bad. I used 100% of my 5-hour usage in less than 1 prompt. 2. I specifically gave it a threejs task because it is an area that SOTA models have made big strides in, that other models just are not great at. I asked it to build a replica of Rocket League. I'll put the prompt in the comments. The game was pretty bad and notably worse than GPT 5.5. Even after multiple fixes, it took 7-8 back and forth with Codex just to get it an almost playable condition. Prior to these fixes, the game was not playable. Maybe it's really strong in other disciplines. I'd love to test that but I hit my limit in 1 prompt lol. GPT 5.5 by contrast did a pretty good job and required no follow ups. Fable would have absolutely nailed this as well. But yeah, early impressions...not great. But I hope I'm wrong. More testing tomorrow.
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I tried this so you don't have to. I know this is going to absolutely shock you but no this does not match the performance of Mythos. A few early thoughts: 1. The limits are pretty bad. I used 100% of my 5-hour usage in less than 1 prompt. 2. I specifically gave it a threejs task because it is an area that SOTA models have made big strides in, that other models just are not great at. I asked it to build a replica of Rocket League. I'll put the prompt in the comments. The game was pretty bad and notably worse than GPT 5.5. Even after multiple fixes, it took 7-8 back and forth with Codex just to get it an almost playable condition. Prior to these fixes, the game was not playable. Maybe it's really strong in other disciplines. I'd love to test that but I hit my limit in 1 prompt lol. GPT 5.5 by contrast did a pretty good job and required no follow ups. Fable would have absolutely nailed this as well. But yeah, early impressions...not great. But I hope I'm wrong. More testing tomorrow.

am.will

591,581 views • 1 month ago

After creating Remodex: Codex remote control for iOS I decided to chill a bit by building a browser sidebar inside Theo - t3.gg 's T3 Code You can open it with Cmd+Shift+B This software is so easy to "manipulate" and build upon Congrats to all the guys that put the work in it because it is great I certainly will be building more things with it For this one I decided to switch from the Codex App to the Codex CLI too just to see how it works And boy it was so good
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After creating Remodex: Codex remote control for iOS I decided to chill a bit by building a browser sidebar inside Theo - t3.gg 's T3 Code You can open it with Cmd+Shift+B This software is so easy to "manipulate" and build upon Congrats to all the guys that put the work in it because it is great I certainly will be building more things with it For this one I decided to switch from the Codex App to the Codex CLI too just to see how it works And boy it was so good

Emanuele Di Pietro

38,905 views • 4 months ago