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Claude Opus 5.5 built a full open world game that runs in your browser zero assets. terrain, creatures, boss fight, animations, sound, music. all code it even cut this trailer and made the soundtrack (cover is image generated) play it:

Leon Lin

21,793 subscribers

39,986 views • 1 day ago •via X (Twitter)

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54 Comments

Leon Lin1 day ago

btw the lag in the video is my laptop, not the game. slow igpu + screen recording at the same time

Leon Lin1 day ago

right?

Oskar1 day ago

How expensive and time-intensive it was? looks beautiful

Leon Lin1 day ago

16h, two prompts. (it stopped 3 times because of the 5h limit)

.1 day ago

@Oskar0084 Was this on the 20$ plan ?

Leon Lin1 day ago

@Oskar0084 brother the plans are not THAT subsidized

.1 day ago

@Oskar0084 Yeah that's, what i thought so it's the 100$ plan or the 200 one ?

Leon Lin1 day ago

@Oskar0084 200

Thomas Ricouard1 day ago

Okay

Leon Lin1 day ago

wdym okay 😭

Shikhar1 day ago

@TokenGremlin Dude this is incredible. How long did it take?

Leon Lin1 day ago

@TokenGremlin about 16h for everything!

Shikhar1 day ago

@TokenGremlin Damn. Very good stuff

Hermes Agent Tips1 day ago

holy smokes dude thats crazy

Leon Lin1 day ago

tyty

Leon Lin1 day ago

A few more things Opus created A map, menu, start story,... fight animations below in one video and in the other a bossfight

C4KE1 day ago

I'm playing right now. This is crazy! Loving it!

Leon Lin1 day ago

i played it for like an hour, first AI game I made that I played for such a long time

C4KE1 day ago

It's legit good! Perfect lil game to play for some downtime.

Dara A.1 day ago

I will be no hitting this as soon as possible

Peter Yang1 day ago

wtf this is the most imperssive game i've ever seen!!!

Leon Lin1 day ago

thanks a lot! opus cooked hard

Athrix ☄️1 day ago

Loved it broski

Tokdev1 day ago

This is incredible ! How could he make the music himself? Can you share more technical details Prompt etc

Leon Lin1 day ago

will share the two prompts probably tomorrow and opensource everything!

BenIt Pro Max Ultra1 day ago

OMGGG

Leon Lin1 day ago

told you hahah

BenIt Pro Max Ultra1 day ago

AJGK3KXJWLVNRJXHDBFBKEJV AGHH

Leon Lin1 day ago

😂

Miguel | AP1 day ago

incredible

Blckgenesiz1 day ago

very impressive - wow

Celestine1 day ago

looks fucking amazing

SalmanAlFares001 day ago

insane bro

Alan1 day ago

crazy

Dr.Mo1 day ago

Why tf is now Opus the sota my mind cant comprehend this anymore wdym Astra was released 20 days ago and now anthropics mid-class model is the best? Like come on the Singularity is wild friends

J A Z I I1 day ago

my laptop crashed wadahelly you cooked harderrrr

Leon Lin1 day ago

windows probably? same as me?🙏🏻😭

J A Z I I1 day ago

yeaaah same pain

am.will1 day ago

very cool!

Moretto1 day ago

man that's something else and it blows my mind when you think this is the worst it will ever be

Iken1 day ago

impressive!! am trying to make something similar opus 5.5 is really good tbh!! it's just too good in threejs.. we need a native threejs implementation that models are good at! then we can ship it to all platforms w good performance

Greg_Ld1 day ago

Now I wanna spend my weekend there... You cooked on this one Leon (or...Opus?)

Chris Laupama1 day ago

what?! THIS IS INSANELY GOOD?!

Luke Schlessinger1 day ago

insane

chri1 day ago

wtfffffffff

Mr Pixel | Driftania 🏝1 day ago

Full open world game in a browser is not a flex, it's a statement of a new era. 🎮 My is also browser game 🙂

Kaitlyn Olivah1 day ago

zero assets is the flex. how much of the combat actually held up when you played it?

Aditya1 day ago

Damn that’s crazy

Julian1 day ago

Bro,imagine the next mythos class model

Alex1 day ago

generative audio direction and trailer edit in one shot is the part that's not predictable yet

David Tran1 day ago

Opened Arkenfall but have not hit the boss yet. There's some real satisfying about the traversing the world and the combat is solid for a browser game.

Zyterx1 day ago

Insane. Did you use a gauntlet loop for this?

Leon Lin1 day ago

nope

Thomas Jørgensen1 day ago

nice work

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