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New Opus 4.8 crashed Opus 4.7 at physics on canvas! We gave both models the same three prompts: simulate a real physics phenomenon on raw HTML5 canvas. Prompt 1: "A triple pendulum swings into chaos and paints glowing trails with its tip" Prompt 2: "A 1 kg block bounces... show more

atomic.chat

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638,609 views • 4 months ago •via X (Twitter)

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39 Comments

Hugo Plat4 months ago

thanks I’ll buy Opus 4.8 to pass my physics exam

atomic.chat4 months ago

@the_great_hug0 the right decision!

Chandraprakash Darji4 months ago

This is the result from sonnet with medium thinking

atomic.chat4 months ago

Sonnet did solid job here

Chandraprakash Darji4 months ago

I think it is better then 4.7

LiberalSismo4 months ago

Now gives us examples about something that we would use in real life and not for just make an X post.

Shounak Das4 months ago

Skill Issue

Hutch, D.O.4 months ago

Fun exercise. Thought I'd have my agent Sirius give it a shot. What I think he did pretty good. @OpenAIDevs

atomic.chat4 months ago

@OpenAIDevs sirius did pretty well! Appreciate seeing builders run the same experiment with their own agents :))

iksammy14 months ago

Impressive

cws test4 months ago

nice

Alexander Benz4 months ago

The pendulum test is the best physics benchmark I've seen. Canvas code that produces realistic chaos requires actually modeling the system, not just pattern-matching from training data.

atomic.chat4 months ago

exactly! and fake motion vs real chaotic dynamics shows up immediately

Venkatesh4 months ago

For these comparisons you need to launch opus 4.7 2x times vs opus 4.8 2x. You could be just looking at run to run variations of how these LLMs work.

insightformer4 months ago

Very interesting comparison visualizations. It clearly shows the differences between the models.

WeSee4 months ago

We're slowly reaching the point where model upgrades feel less like "better chat" and more like software evolution.

Tech With Matteo4 months ago

the pendulum one is wild, i use Opus daily for coding and the jump from 4.7 to 4.8 on complex stuff is pretty noticeable

rpello4 months ago

Have these prompts run on each model’s release date? Or have you used a today’s 4.7 (crippled) version?

atomic.chat4 months ago

opus 4.7 is crippled:))

Samir Patil4 months ago

4.8 is wild 🔥 Built Claude Pulse for exactly this — live KV cache timer + usage right on claude .ai.

BruzWJ4 months ago

tbh the triple pendulum render looks slick but a canvas physics demo doesnt really tell me if the model holds up on actual coding work

Cristobal Santana4 months ago

Nice. The pi-digits collision one is a good test because it needs exact physics, not just something that looks plausible. Curious whether it holds up on messier problems like fluids or soft-body collisions, where the math gets harder to fake visually.

Sathish Harry4 months ago

992 isn't a random number. The Galperin billiard: collisions ≈ π × √(M/m). With a 100,000:1 mass ratio, that's π × 316 ≈ 993. Opus 4.8 essentially solved the physics. 4.7 got 241 not even close. The benchmark is the whole point.

Rohit4 months ago

That's impressive! It's fascinating to see how Opus 4.8 handles complex physics simulations. Looking forward to more insights from your comparisons.

atomic.chat4 months ago

@ai_rohitt glad you enjoyed it! More side by side runs on the way

Sebastian Buzdugan4 months ago

did either use a fixed timestep because variable dt usually makes canvas physics demos lie

Build with Jeje4 months ago

opus 4.8 math model is so great. only the limit sucks 😔

GiovanniArturi3 months ago

Sorry, but what as to do Opus with local AI models? It can only run remotely on Anthropic servers via APIs.

🐺 steve 🐺4 months ago

CC @RayKurz

Noureddine4 months ago

4.8 crashing on physics implies an over-eager alignment filter. Complex simulations can hit safety boundaries if intermediate steps are misinterpreted as harmful or exploit prompts.

Gia huy4 months ago

本当に面白そう！バージョン4.8がバージョン4.7を打ち負かしたんだね。どんな物理現象が再現されているんだろう？楽しみ！

Ex0 Byte4 months ago

i want to use this to improve my memory system! can i use atomic chat to benchmark my self improving memory system?

Ziv Chen4 months ago

Should it be Opus 4.8 or 4.6? Opus 4.7 has received mixed reviews.

Life Around Earth4 months ago

the detail in that pendulum prompt is actually a solid benchmark for chaos visualization

atomic.chat4 months ago

Yeeah, exactly why we picked it!

Blum4 months ago

wild how clearly opus 4.8 dominates 4.7 here

AIじいさん4 months ago

壁を通りぬけるのは面白いんじゃ🤣

Theoden4 months ago

We definitely should see more hard, thick balls hitting the wall more often

Snowdog_base3 months ago

Snowdog has been watching this for 3 hours. 🐾❄️ Not the physics. Not the AI benchmark. Just the bouncing balls. 🟡 Same energy as staring at snow falling at 3am. ❄️🍯 $SD #Snowdog

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247,923 views • 1 year ago

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179,535 views • 1 month ago

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Diego | AI 🚀 - e/acc

34,210 views • 9 months ago

A brush full of dreams, a night full of stars, and a town transformed by magic.🪄🎨 Created it on FlovaAI PROMPT: 3D style animation. A cozy, cluttered attic art studio filled with glowing potion bottles, sketches pinned to the walls, and warm light streaming through a large circular window. A young female artist with her hair in a messy bun, wearing an apron, paints on an easel. The painting of a glowing creature magically comes to life, leaping off the canvas as a vibrant, translucent creature made of swirling iridescent cosmic light and sparkles. The creature runs out into a cobblestone European village square at night, leaving a trail of glowing rainbows and magical stardust that transforms the town, ending with the night sky swirling into a beautiful, vibrant Starry Night style pattern. Whimsical, magical, high-end digital animation, warm and cinematic lighting. #Flovaai #Flovacpp

A brush full of dreams, a night full of stars, and a town transformed by magic.🪄🎨 Created it on FlovaAI PROMPT: 3D style animation. A cozy, cluttered attic art studio filled with glowing potion bottles, sketches pinned to the walls, and warm light streaming through a large circular window. A young female artist with her hair in a messy bun, wearing an apron, paints on an easel. The painting of a glowing creature magically comes to life, leaping off the canvas as a vibrant, translucent creature made of swirling iridescent cosmic light and sparkles. The creature runs out into a cobblestone European village square at night, leaving a trail of glowing rainbows and magical stardust that transforms the town, ending with the night sky swirling into a beautiful, vibrant Starry Night style pattern. Whimsical, magical, high-end digital animation, warm and cinematic lighting. #Flovaai #Flovacpp

Soulful Ai

28,560 views • 3 months ago

$This is F**king dangerous Someone figured out how to get dramatically sharper reasoning out of Opus 4.8 with one setup. Here is how: Ask Claude to write you an "operating manual" for how it should reason through your work Create a new Claude Project and paste that .md into the Project instructions Run Opus 4.8 on High or Max effort Now the model reasons against a real framework instead of improvising every response. Same model. Far better output. And Opus 4.8 already costs a fraction of Fable 5. Save and bookmark this. Follow CyrilXBT$

This is F**king dangerous Someone figured out how to get dramatically sharper reasoning out of Opus 4.8 with one setup. Here is how: Ask Claude to write you an "operating manual" for how it should reason through your work Create a new Claude Project and paste that .md into the Project instructions Run Opus 4.8 on High or Max effort Now the model reasons against a real framework instead of improvising every response. Same model. Far better output. And Opus 4.8 already costs a fraction of Fable 5. Save and bookmark this. Follow CyrilXBT

CyrilXBT

198,085 views • 2 months ago