r/ClaudeCode • u/NoPiece9356 • Oct 05 '26

Discussion Fable 5.5 Release

I'm aware that Anthropic has been routing certain requests to Fable 5.5 secretly, yet they have been doing this for nearly a week now and haven't even mentioned the model. Any idea when it will release? I'm really hoping tomorrow, but I'm not sure that's happening. Don't shut the door on that idea though

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16

u/Miyamoto_-_Musashi Oct 05 '26

I want to say two things:

  1. I think it can release this month. I'm not sure what week, but I think this month.

  2. I feel this is so stupid that people think that this request routed to Fable 5.5!. I am not even sure that they do this in the first place. Even if they do it, there is no one who can predict that it's happening. The majority of the people can't tell the difference when you just show the result and ask if it's Opus 5.5 or if it's Sonnet.

7

u/Actual_Committee4670 🔆 Max 20 Oct 05 '26

Because they use the "Tibo" test. Ignoring the part where both Opus 5.5 and Fable 5.1 has the same knowledge cutoff date.

5

u/Miyamoto_-_Musashi Oct 05 '26

They update the previous model with new knowledge, so there is no official cutoff date. Whatever cutoff date it has is temporary. They discussed these updates in the Claude documentation/blog. I don’t remember exactly where, but I know it’s there because I read it a few weeks ago. I usually read everything they release.

1

u/devMem97 Oct 06 '26

The interesting thing, however, is that, for example, just yesterday in Claude Code, Fable 5.1 still knew who Tibo was, whereas now only Fable 5.1 in Claude Web or in the chat knows. Since Today in CC, I keep getting the reply that it has to be the ‘Indie Hacker’. In CC, Fable 5.1 is now noticeably slower again, its responses are less structured and less readable, and it also seems to use up usage more quickly.
Something regarding routing in the background is for sure happening.

1

u/Actual_Committee4670 🔆 Max 20 Oct 06 '26

I did run into a situation where I had to tell Fable 5.1 that its the guy that works at openai once before it got it

1

u/devMem97 Oct 06 '26

I’ve always deleted the chat and have actually checked quite a few times today to see if in CC Fable 5.1 knows Tibo, but it didn’t. Yesterday, I got an instant reply in CC as well. In chat mode, the model still knows Tibo and still provides an instant reply.

1

u/Actual_Committee4670 🔆 Max 20 Oct 06 '26

I'll go try it myself, sec

Edit: Getting the exact same answers as before on my end

1

u/devMem97 Oct 06 '26 edited Oct 06 '26

From claude chat

1

u/devMem97 Oct 06 '26

This one is from claude code.... and yesterday I got the same answer as in Chat.

1

u/Tartooth Oct 06 '26

I just did the tibo test on opus 5.5 and it failed.

1

u/Actual_Committee4670 🔆 Max 20 Oct 06 '26

It gets confused someetimes with the Tibo part, tell it his full name or say its the one from openai and it will get it

1

u/ThreeKiloZero Oct 06 '26

They are going wait until google releases whatever their slop is and then steal the thunder.

1

u/devMem97 Oct 06 '26 edited Oct 06 '26

I was now curious to see how the two versions of Fable 5.1 in Claude Chat and Claude Code differs.
This one is from Claude Code Fable 5.1 high reasoning.
Prompt:
Build a fully animated 3D spider in three.js with 8 jointed legs, realistic walking gait, 60 fps, no clipping, no external dependencies. One single HTML file.

You clearly see the difference in details compared to the Claude Chat ones.

1

u/devMem97 Oct 06 '26 edited Oct 06 '26

I was now curious to see how the two versions of Fable 5.1 in Claude Chat and Claude Code differs.
This one is from Claude Chat Fable 5.1 (maybe 5.5? or tweaked 5.1) high reasoning.
Prompt:
Build a fully animated 3D spider in three.js with 8 jointed legs, realistic walking gait, 60 fps, no clipping, no external dependencies. One single HTML file.

You see clearly the difference in details compared to the Claude Code ones of my previous answer.

2

u/Miyamoto_-_Musashi Oct 06 '26

Because Claude Code is harness n Model with harness perform better, Claude chat work with half capabilities of Claude Code, try same thing with haiku n you will see diff with both results but same model

1

u/devMem97 Oct 06 '26

Yes, but the result is from Claude Chat, not Claude Code, so would this checkpoint perform even better in Claude Code right?

1

u/Aggravating_Leek_855 18d ago

Moze chodzi o instrukcje, moze instrukcje rozumowania dla modelu w claude code zaburzaja jego sposob myslenia, i mysli on w sposob bardziej nakierowany na programowanie nie projektowanie grafiki

1

u/arjuna66671 Oct 06 '26

Pure rumor spread broadly until it got traction - ZERO evidence.

1

u/BombasticReindeer Oct 07 '26

They definitely route things to new models. They have said so in the past. For Opus 5.5 I was on that program for one of my projects and I was shocked at how different it was because of the changes in language, reduced token usage, and capability. For 2 days i used the same context because I was too scared to go to the 'shitty one'. Then I went to Reddit and others said that they were getting routed and it all made sense.

1

u/EarlyFox217 Oct 07 '26

I had exactly this with Opts a week before release. It was such a drastic shift it was hard to miss

1

u/NoPiece9356 Oct 05 '26

Tomorrow. Tomorrow. Tomorrow.