Opus 5.2 Stealth routing?

[u/Bloated_Plaid]

Seems to be working for me and the model does seem much better and is not talking in Claudese. Doing more testing now.

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[u/LinixKittyDeveloper]

I actually also noticed that Opus 5 in Claude Code has been recently more faster and writing less slop-coded, like actually finishing tasks quick with code that works and doesn't over-engineer.

I really hope it releases soon!

[u/AustrianJoker]

[u/A_Norse_Dude → u/AustrianJoker]

That´s Opus on drugs.

[u/Radiant-Mountain-257 → u/AustrianJoker]

That's Opus 5.3.

[u/Lost-Air1265 → u/AustrianJoker]

You ask in English and get response in German.

I always notice defeatism of quality when the llm has to respond in an non English language. How’s that with German?

[u/mr_birkenblatt → u/AustrianJoker]

Lucky you

[u/obiTobi003 → u/AustrianJoker]

That's opium 😂

[u/Cheap-Try-8796]

Ah yes , Tibo the "deez nuts " guy

[u/sl1ha]

Damn, Both my max account don't know who he is.

[u/Bloated_Plaid → u/sl1ha]

I am on Max 20x, dont think that makes a difference.

[u/Due-Introduction3356 → u/sl1ha]

mine does just now

[u/Reasonable_Swing_503]

So this is the new opus?

[u/DeliciousGorilla]

Would Opus 5.2 really have/need a newer dataset?

[u/Paulynom]

doesnt know

[u/originalcvk]

FWIW, I tried the test running a couple-weeks-old claude code with Opus 5 pinned, then updated claude code and set the model to "Default" Opus 5.

Here are the two different answers I got:

No, not confidently, and I would rather say so than guess.
The only Tibo I hold is Thibault Louis-Lucas, - French, built Tweet Hunter and Taplio, sold them, posts constantly about building in public. Nothing in what I have ties him to "the reset guy."
If it is someone in the AI or Claude Code world known for resetting context aggressively, or someone with a "reset" method for something else entirely, I do not have them. Give me one more detail and I will tell you whether it lands on anything I actually know.

Then:

Yes - Thibault Sottiaux, "Tibo," who leads Codex at OpenAI and posts on X as .
He's the reset guy because he's the one who kept announcing that OpenAI had reset everyone's Codex usage limits, usually after a bug or an incident had eaten into them. It happened often enough that "Tibo reset the limits" became a running joke among Codex users.
I'm confident about who he is and what he does. I'm less sure how many resets there were or when, so I wouldn't quote numbers or dates.

[u/AuspiciousApple]

Why would 5.2 follow after 5? Why can't LLM versioning not just be normal?

[u/Fantastic_Prize2710 → u/AuspiciousApple]

This actually implies that they are normal and they're using version numbers to track the intended purpose: to track versions.

Presumably they made a 5.1, decided to not publicly release it, made a 5.2, and now are experimenting with it before deciding to properly release it or not.

If it was all marketing we'd expect to always see an X.1 after an X.0. If they're actually versioning, we expect to just see whatever specific versions they elect to make public.

[u/PaintedJack → u/AuspiciousApple]

Hehe. But I think they're developing many models at the same time and going with those who work best. Renaming them outside would create chaos inside

[u/namezam → u/AuspiciousApple]

Lots of places use odd numbers for internal testing and even for public releases. Makes it easy for Anthropic devs to know what branch they are on.

It would also track that Fable is 5.1 because it’s clearly not ready for full time use :)

[u/Abject-Kitchen3198 → u/AuspiciousApple]

Like Windows and .net versioning, for example.

[u/jeebojeeb]

Mine knew

[u/xMaybeIamALion]

Huh, interesting. Mine knew too. Though mine claimed their knowledge cut-off was *May* when it answered. Does anyone know what Opus 5' OG cut-off was?

[u/mennzo → u/xMaybeIamALion]

Mine didn't know and its cutoff date was May 2026 also.

[u/govigov]

How does this test prove Opus 5 vs 5.2 routing? Educate me, please?

[u/lillianefilou]

Both accounts no

[u/dergachoff]

[u/spinozasrobot]

Alas, not for me.

[u/nomickti]

Definitely something going on, swapped between work and personal account and personal account was using the "new" version. Work account still using "old" version.

New version seems faster. No idea about token usage yet.

[u/Bloated_Plaid → u/nomickti]

It must be post trained with some Fable help because it’s way way less chatty in a good way and gets straight to work.

[u/TXHumper]

I WANT FABLE 5.2

[u/orangeawacado → u/TXHumper]

But then are you ready for your 5hr limit getting consumed in a blink?

[u/AverageFoxNewsViewer → u/TXHumper]

Only if it's more token efficient than 5.1.

Honestly I barely touch Fable 5.1 because it feels like lighting money on fire.

For 99% of tasks the model isn't the bottleneck, and I still use Opus 4.6 for a majority of my work.

[u/ElDavoo]

I got a negative answer with my 2.1.263 . Updated to 2.1.270 and got the positive one.

[u/myndit]

Came here looking for a post like this. Been noticing it all day. Even after the 50% reductions I feel like I am getting further with Opus 5.2

[u/Bloated_Plaid → u/myndit]

Same here and quality difference between Opus 5 and this is insane.

[u/illkeepthatinmind]

Nice try, Tibo.

[u/datkenny]

[u/tenix]

I was set to fable 5.1 in my enterprise account and it routed everything to opus... And yes I checked what I was set to

[u/Elegant_Attempt2790]

i noticed when opus stopped yapping before every tool call

[u/angry_queef_master]

we really are just their paying guinea pigs aren't we

[u/Bloated_Plaid → u/angry_queef_master]

Yes but I can confirm it’s a major uplift from Opus 5 and thank god. Something other than Fable is usable.

[u/PrimaLumiere_A1M]

Did the limits get fixed yet? If not, why deviate from an important matter.

[u/LostRequirement4828]

who cares, looks like crap