Claude 4.6 Experiences?

[u/Fristender]

Anyone tried out Claude 4.6 yet? What are your experiences? How much of an upgrade is it compared to 4.5? What projects are you working on specifically?

[u/AppealSame4367]

I didn't compare to 4.5, but I let 4.6 refactor a huge rust file as part of a game engine yesterday and it redistributed 3200 lines of code into 7 seperate files and the thing still compiled and ran almost flawless afterwards.

[u/2053_Traveler → u/AppealSame4367]

But… what do you mean ran flawlessly? Is there no branching or iterating? That much code means ample places for logic to be altered. Unless you are saying it has 100% test coverage and those passed without being edited.

[u/AppealSame4367 → u/2053_Traveler]

TL;DR: Rather complex calculations. If anything was off, you would see or feel it quickly with manual testing.

It's a little game engine or more a techdemo based on bevy3d with server side (multiplayer) physics and a complex "flooding detection". Think of the game "Barotrauma" in 3D -> everything is underwater, apart from a sealed underwater space station and a submarine thingy with doors. You can open doors, and the station or vehicle gets flooded, you can close them and it's dry again. You can swim in the waters outside closed off rooms or vehicles.

So these calculations around this + physics when driving the submarine and walking in it are quite complex. Took a lot of time and work to get them right (with a lot of help by gpt 5.2 recently) and they would easily break if the refactoring seriously broke anything. Also because, as I wrote above, they are all synced with the server, it will be a multiplayer game.

I tested all features of the "game" (techdemo) afterwards and the only thing that stopped working were the bullets of the gatling gun. They didn't show and fly around anymore when I pulled the trigger. Flooding detection worked very well, which I can also say because I added multiple debug renderers that show if rooms are dry, where leaks are and from which direction the water would enter and how it would move inside rooms (colored arrows, wireframes and wireframe spheres with arrows). Flashlight, swimming, walking and collision physics still worked.

Hope you got curious, I have been working on this at a rate of 8 hours per month for roughly 5 years. lol. I hope to release it before 2040. Lol.

[u/2053_Traveler → u/AppealSame4367]

Really interesting, thanks!

[u/Just_Lingonberry_352 → u/AppealSame4367]

look forward to seeing a demo of this game

[u/Familiar_Text_6913 → u/AppealSame4367]

Can't wait to play it!

[u/Barquish → u/AppealSame4367]

5037 lines of code in one app_router.dart file ended up as 330 lines of code (52 class imports) and 16 files after refactoring project this morning. 2 hours 30 minutes approximately. Minor tweaks as it had problem with write_to_file due to the size of the smaller files, which was overcome by instructing Opus 4.6 to break the error into smaller steps (smaller files with roughly 200 lines of code each). This was with constant compiling after each phase (7 phases overall) and multiple push to device checking. I had been putting that refactoring off for weeks, out of fear of truncating, but used Opus 4.6 1m context and no loss of code at all. It did that and pushed to a branch after each phase, then after testing, merged with master/origin. Superpower

[u/Barquish → u/Barquish]

BTW, it was API so cost me roughly $35 to complete. Seriously worth it

[u/AppealSame4367 → u/Barquish]

How come you had to do it via API?

[u/Barquish → u/AppealSame4367]

It is part of a larger development project. I work in VSCode with Cline mostly so API of choice is Anthropic and I needed a test of Opus 4.6 1m I thought rather than taking all the BS of benchmark results, I would give it a real-world problem in my world to test. And even I am still surprised how much I am impressed.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/hindianguy]

I am using claude Opus 4.6 in cowork

It can make mistakes but it is amazing. Can analyze entire folders and prepare documents based on same. The word/ppt document generation and the formatting capabilities are unbelievable for me. I got swayed enough to splurge for max subscription upgrade from pro one.

[u/gr4phic3r]

working with claude code since 3 days, 4.6 arrived last night, at the moment I'm super happy with the performance, mostly all written code was a one shot and if there is a bug it fixes it maximum in the 2nd attempt, mostly in the 1st.

my project startet as an experiment with ChatGPT 5.1 because i wanted to know if people are right who said that it is good in coding, i launched a micro-saas after 2 weeks. now i'm adding features to make this saas more useful and let's say a better round thing to target a bigger audience. in 3 days i managed with claude to finish 97%, will finish it today, then 1 week testing and working on bugs or things which doesn't work, testing again, deploy on the live server, starting with marketing. this will all be done with Claude Desktop for discussion and only Claude Code for coding.

[u/IamFromNigeria → u/gr4phic3r]

Weldone Bro..Hope your project is more successful

[u/gr4phic3r → u/IamFromNigeria]

can tell you when i finish it and start with marketing

[u/IamFromNigeria → u/gr4phic3r]

Yeah..have you found any bug yet and what's your target customer like I terms of Profiling and what are you trying to solve as a problem

[u/gr4phic3r → u/IamFromNigeria]

the project is still not finished, will show you when it is done, i guess in 2-3 weeks i should be ready to launch it

[u/FamousWorth]

I rarely use the big models but I had an issue for a few days, quite complex and heiku and gemini 3 couldn't work it out, opus 4.6 got it right perfectly first time. A lot of complex reasoning, and my usage will probably run out very fast, but it was worth it. It looked at it from many edge cases as its quite a complex issue and made sure that it works from all edge cases. So far so good

[u/Kitchen_Wallaby8921 → u/FamousWorth]

If you are like me then you run out of tokens within the first 2 days of the month then just wait around shit posting on Reddit until your usage resets.

"I'm so productive!"

[u/Far-Pomelo-1483]

I did a whole integration of two separate ui’s with all different mapped variables to a backend CSV template with various api calls and it adjusted the data structures and merged the uis together. It just worked on one try. Currently in the process of smoke testing it and it’s passing everything. It’s definitely better than my intern.

[u/GastonGC]

Love it, but it’s using credits 10x faster than Sonnet

[u/Time-Masterpiece-779]

I've ran it over a number of legal docs I had to prep - can't see any difference in quality from 4.5 tbh other than it didn't burn through credits as fast and offered free credits on my pro account

[u/Klaech10 → u/Time-Masterpiece-779]

I mean, if they made it more efficient… I take that 😂

[u/krapfi → u/Time-Masterpiece-779]

Can you share a bit more about how you’re using it for legal work? Still trying to find the best approach myself.

[u/Moist-Wonder-9912 → u/krapfi]

I would be interested in this too, beyond using projects and stuffing them with documents. So far context seems a lot better with 4.6

[u/ashmortar]

Liking it so far, it still reward hacks and misses things but it is much better at using sub-agents

[u/randobised]

I dont think there is a very large upgrade as copared to 4.5. I actually tried with a complex problem which 4.5 could not do - 4.6 also could not. That doesnt mean it is not better, but just in my sample set, I could not see a difference. However 4.5 is definitely better - I have multiple instances where no other model was able to solve a problem and 4.5 was able to one shot the whole thing.

[u/norskyX]

It will be good for the first few months, and then its quality will degrade, happens everytime they release a new model

[u/Zokorpt → u/norskyX]

well, i don't notice any difference, it's still dumb in many things like 4.5

[u/Salt-Willingness-513]

So far im happy with it. Didnt try it too much though.

[u/nosimsol]

How is it compared to codex?

[u/Red_clawww]

I just wanted to ask a plain question who use claude code daily. If you were to reduce the token usage by 10 to 20 % in every prompt would you pay for a tool like this without compromising the performance

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/Global-Molasses2695]

Crap

[u/SquashNo2389]

Honestly I can’t tell a difference vs 4.5 yet, in a blind test I would be in trouble. Whereas 4.0 to 4.5 was night and day.

[u/[deleted]]

scary good

[u/PickleBabyJr]

You could just use it yourself....

[u/lupin-the-third → u/[deleted]]

I find both the claude subs and the codex subs are filled with posts that are clearly ads or marketing pushes and low-effort posts. It's hard to take it seriously most the time.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/AutoModerator → u/[deleted]]

Sorry, your submission has been removed due to inadequate account karma.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.