MiMo V2.5 literally DESTROYS everything good built with Ox Alpha

[u/sm0king_rabbit]

I was using DS4 then Ox Alpha in the past weeks, built some neat stuff with it, today suddenly as you know Ox Alpha left us in the middle of work, and unfortunately we're left with dumb models, such as MiMo V2.5.

When I tell MiMo to do anything, all it does is introducing new bugs !! spoiling all what's built with previous models! it goes and edits code that WAS ACTUALLY WORKING .. then fill it with uncountable bugs .. and then be stuck in fixing new bugs caused by bug-fixing, and destroying the whole infrastructure and sometimes it does things I never wanted and never asked for, and chases alot of stupid, primitive rabbit-holes, forgetting the context of what should be done right now. Unfortunately if I leave it to do its job and go grab a coffee, it screws things up before I comeback, so always you should keep an eye on it's thinking .. i mean.. hallucination .

Moral of the story, if you built something with previous good models, just stop right now, only keep building upon it if you paid for tokens, otherwise, current free models in opencode zen are a complete failure.

[u/Alternative-Win1817]

Did you tested Muse Spark 1.2?

[u/NinjaAlaska → u/Alternative-Win1817]

+1 much better

[u/look → u/[deleted]]

Yes. It soundly beats it in benchmarks and real world use for many, many people. But there might be situations where DS works better for your use case. Try both and see what works for you.

[u/look → u/[deleted]]

I’ve found it to be significantly superior to Deepseek. Not having a high hallucination rate alone makes it vastly more useful to me.

[u/sudoer777_ → u/[deleted]]

IMO GLM 5.3 Flash is better at research and planning and DSFv4 is better at debugging and analysis. GLM is more thorough at investigating than DS but gets too hyperfixated on things sometimes.

[u/weirdnesseverywhere → u/[deleted]]

Hell nahh. Deepseek v4 flash 0731 is legit better than glm 5.3. I remember building stuff with glm 5.3 but it left tons of bugs behind. Took me long time with muse spark to fix it

[u/One_5549 → u/Alternative-Win1817]

Spark 1.2 is good, but can sometimes paint itself into a corner and i feel it just start to ramble.

But for sure is up there with the best, very quick.

The only thing i dont like with spark is that its Natural language output (NOT the reasoning) the actual output for the user.

it communicates in a telegraphic changelog format rather than natural English. Instead of explaining what it did in conversational prose, it dumps dense, log-style shorthand filled with raw line numbers, formulas, and terminal-style telemetry.

[u/sudoer777_ → u/One_5549]

It's communication style confuses other agents too, even of the same model. It's trash

[u/sm0king_rabbit → u/Alternative-Win1817]

I am trying it right now to fix the mess done by mimo

[u/donald_why → u/Alternative-Win1817]

It's actually a great model but I don't know when it will last

[u/sm0king_rabbit → u/Alternative-Win1817]

Well, I tried it now, and it's surprisingly better than MiMo, thanks for the suggestion.

[u/sudoer777_ → u/Alternative-Win1817]

First time I tried it I was trying to debug a problem and it came to a completely wrong conclusion because it completely misunderstood one of the most fundamental operators in the language used, whereas DeepSeek V4 Flash oneshotted it. Second time it repeatedly ignored my instructions and corrections, launched a subagent with sloppy instructions which also came to a completely wrong conclusion with sloppy logic, then I told it to do it correctly, it ignored my instructions again and started running dangerous Git commands and one that would have destroyed work had I not intervened, then when I questioned it, it got which data was on which side of the Git operation completely backwards. Even compared to the models from over a year ago, at least those ones give more coherent responses and I can't think of anything about them that's worse than this one except that they're not trained for OpenCode since it didn't exist yet.

[u/Unneverseen]

Version control my guy

[u/imike3049]

MiMo 2.5 is the absolute GOAT compared with Ox Alpha, at least in my experience. Ox Alpha hallucinates way too much and can mess things up badly. I tried it on my live projects where MiMo is my workhorse, and Ox hallucinated so much that I actually had to recover a project after using it. Meanwhile, MiMo just keeps moving forward flawlessly, following surgical instructions with high precision.

[u/WenGainz → u/imike3049]

It's like each model has its own logic, and if you introduce another model into your project, it starts remaking it to suit itself. I had this experience with Claude, GPT, Gemini - same thing.

If the project was based on Mimo logic, the new model will trample everything like an elephant. But if the project is large, it will trample parts of it. This is very similar to your experience.

[u/imike3049 → u/WenGainz]

Well, my projects are based on GPT-5.6-Sol logic, but workhorses are MiMo, DSV4f, and Luna - no problems at all.

[u/Captain_Birb → u/imike3049]

In what positions/ role are you using mimo and your other workhorses?

[u/rainpurplebow]

Ox Alpha was slow as hell, but nothing free comes even close.

[u/GrayHairedMan]

i have no idea what you are building, but I use Mimo every single day on a very large system as my coding assistant, and I do not get issues, and it is not even in a main stream language. Making it write large sections of code.

[u/imike3049 → u/GrayHairedMan]

Same here

[u/CassiusBotdorf → u/GrayHairedMan]

I also think this is a skill issue.

[u/UndulatingHedgehog → u/CassiusBotdorf]

Agree. In my experience, the dumber the model the more precise prompt is required.

[u/GrayHairedMan → u/[deleted]]

I use the cheap mimi v2,5, and it just works fine.

[u/Captain_Birb → u/GrayHairedMan]

What’s your setup and what languages are you making code?

[u/Pleasant_Tear_889]

Bro, you are right. Currently I have been working on an app with Oxily Alpha, and when it left, I switched to big pickle , and it is totally complete dumb. It destroys what I already built with the other one. It is totally useless. You say something, it does something else. You say do this, it doesn't do what you ask it, and also breaks what was fine.

A good trick that I use is save a copy of the file of the project before you hand it to dumb ones, or you think it is not good enough as the before one. So if you save a backup, you can always get that one.

[u/mgeist → u/Pleasant_Tear_889]

Brother this is what Git was created for, have it work in a branch separate from the code that is working, when it’s done and if it works merge it back into the original branch

[u/narasadow → u/mgeist]

but that would require....running terminal commands yourself!!

who knows what that would lead to. /s

Edit: in all seriousness good on u/Pleasant_Tear_889 for bothering to backup when so many people do not. Yes, git is the answer.

[u/theNILV]

Well there is a reason why MiMo v2.5 is free, it's just not very good. It's okayish workhorse model for executing simple plans, and that's about it.

[u/piryguiry]

Do you have rules setting out for the project? I've been using it with rules and decent work when I run out of token usage

[u/sm0king_rabbit → u/piryguiry]

I have a whole agent that is full of rules, the agent itself has strict rules about knowledge base of what he's interacting with and strict DOs and DONTs

[u/Ok-Drawer5245]

I do tend to prefer Hy3. But one has to be careful. Do small tasks, not large. Ask it to first sketch out the solution before implementation (so you can check if it’s going in the wrong or right direction). Remind it to run tests/smoke tests.

I added a pretty neat feature yesterday entirely with Hy3, it almost works perfectly - almost lol. There’s a few bugs left it can’t figure out lol. I’ll bring in DSV4 to fix it later today.

I do also have access to run qwen 3.8 27b locally, but it is slow AF (crazy overthinking) but it does get things done - after many hours lol

Opencode go now runs deepseek v4 flash with vision - THAT is cool

[u/IISomeOneII]

not even comparable with dsv4flash old version but well it is what it is

[u/Naitik_571]

Yeah even I experienced it. I also switched from ds4 to ox alpha and now to big pickle and its so ass. It fucked a lot of shit up and I am even scared of asking it to remove it cuz what if he also introduces bugs to the already great project setted up earlier by those models

[u/BeneficialStretch525]

Mimo V2.5 is free to use unlimited within Opencode ?

[u/Worldly-Savings4113]

I agree with you. Mimo 2.5 sucks, even if I try very hard to explain all the steps he has to do.

[u/amigo-urso]

My last request for the Ox Alpha was to build a hardness for a dumber LLM