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Anthropic Launches Claude Fable 5, Its First Public Mythos-Class Model

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Anthropic today announced the launch of Claude Fable 5, a Mythos-class model that it says is safe for general use.

claude-fable-5.jpg

According to Anthropic, Fable 5's capabilities exceed those of any model it has made generally available, and Fable has demonstrated "exceptional performance" for software engineering, knowledge work, vision, scientific research, and more. It outperforms Opus models on longer, more complex tasks. Fable 5 can work autonomously for longer than any prior Claude model.

Fable 5 is being released with conservative safeguards to prevent it from being misused in areas like cybersecurity. Questions about some topics will instead be answered by Opus 4.8, with safeguards expected to trigger in less than five percent of sessions on average. Most queries related to cybersecurity, chemistry, and biology will get responses from Opus 4.8 instead of Fable 5.

Anthropic is also releasing Claude Mythos 5 for a small group of cyberdefenders and infrastructure providers. It uses the same underlying model as Fable 5, but with some of the safeguards lifted. Mythos 5 is being deployed through Project Glasswing as an upgrade to the Claude Mythos Preview. Anthropic says Mythos 5 has the strongest cybersecurity capabilities of any model in the world, with access set to expand through a broader trusted access program.

Fable 5 and Mythos 5 are available at $10 per million input tokens and $50 per million output tokens, which is less than half the price of the Claude Mythos Preview. Mythos 5 is available to those who have access to the Mythos Preview, and that includes Apple. Apple is one of Anthropic's Project Glasswing partners.

Claude Fable 5 is included in Pro, Max, Team, and seat-based Enterprise plans from today until June 22. On June 23, the model will be removed from those plans and using it will require usage credits. When Fable 5 capacity is sufficient, Anthropic plans to re-add it to subscription plans.

Article Link: Anthropic Launches Claude Fable 5, Its First Public Mythos-Class Model
 
Article Link
https://www.macrumors.com/2026/06/09/anthropic-fable-5/
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Claude Fable 5, a Mythos-class model that it says is "safe for general use"...

In the rapidly growing AI space where anything goes, funding flows like water and the narrative is tightly controlled, it's buyer beware. Those in the public sector who get drawn in believing the hype while failing to read the terms and conditions are fueling the madness. While certainly there is some usefulness, the opposite could also be argued. The word that comes to mind is nefarious.
 
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zenmacx said:
Claude Fable 5, a Mythos-class model that it says is "safe for general use"...

In the rapidly growing AI space where anything goes, funding flows like water and the narrative is tightly controlled, it's buyer beware. Those in the public sector who get drawn in believing the hype while failing to read the terms and conditions are fueling the madness. While certainly there is some usefulness, the opposite could also be argued. The word that comes to mind is nefarious.
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Literally chatgpt written nonsense. Good lord that wasn't even a good try.
 
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turbineseaplane said:
Keep pumping ... gotta keep that juice flowing for the pre-crash IPO and continue workign on duping folks into accepting polluting, resource sucking, data centers in their back yard that provide like "50 jobs" post construction.

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💥
📉
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I'm more worried about the people who have access to the full unfettered model.

We're already at the point where these things are de facto "military grade."

Cybersecurity, chemistry, biology. Interesting that cybersecurity is now mixed in with the world class deadly things to know too well.
 
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I tried it for troubleshooting something basic and it is really dumb for that. It would ask me to try the same steps it had already given me before. When I would correct it, it would say yes, you’re right and ask me try something else that was tried couple of steps ago.

I guess it’s completely geared towards programming.
 
MacRumors said:


Anthropic today announced the launch of Claude Fable 5, a Mythos-class model that it says is safe for general use.

claude-fable-5.jpg

According to Anthropic, Fable 5's capabilities exceed those of any model it has made generally available, and Fable has demonstrated "exceptional performance" for software engineering, knowledge work, vision, scientific research, and more. It outperforms Opus models on longer, more complex tasks. Fable 5 can work autonomously for longer than any prior Claude model.

Fable 5 is being released with conservative safeguards to prevent it from being misused in areas like cybersecurity. Questions about some topics will instead be answered by Opus 4.8, with safeguards expected to trigger in less than five percent of sessions on average. Most queries related to cybersecurity, chemistry, and biology will get responses from Opus 4.8 instead of Fable 5.

Anthropic is also releasing Claude Mythos 5 for a small group of cyberdefenders and infrastructure providers. It uses the same underlying model as Fable 5, but with some of the safeguards lifted. Mythos 5 is being deployed through Project Glasswing as an upgrade to the Claude Mythos Preview. Anthropic says Mythos 5 has the strongest cybersecurity capabilities of any model in the world, with access set to expand through a broader trusted access program.

Fable 5 and Mythos 5 are available at $10 per million input tokens and $50 per million output tokens, which is less than half the price of the Claude Mythos Preview. Mythos 5 is available to those who have access to the Mythos Preview, and that includes Apple. Apple is one of Anthropic's Project Glasswing partners.

Claude Fable 5 is included in Pro, Max, Team, and seat-based Enterprise plans from today until June 22. On June 23, the model will be removed from those plans and using it will require usage credits. When Fable 5 capacity is sufficient, Anthropic plans to re-add it to subscription plans.

Article Link: Anthropic Launches Claude Fable 5, Its First Public Mythos-Class Model
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This article is written like I know what any of this means (spoiler: I don’t). Mythos? Fable? Opus? Input/output tokens? Also, I don’t see how any of this is related to Apple news or rumors.
 
I have hit the safeguards... probably 10 times today.

very fun and cool

I'm surprised they released it, but also not because of the IPO.

When it works the model is actually extremely good. Not overhyped at all from what I've done today, but Good Lord the safeguards are insane and obtuse.

edit: twice more in the last 10 minutes. very neat. the classifier is hilarious.
edit 2: another 5 minutes later. lmao.
 
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dss33k said:
I tried it for troubleshooting something basic and it is really dumb for that. It would ask me to try the same steps it had already given me before. When I would correct it, it would say yes, you’re right and ask me try something else that was tried couple of steps ago.

I guess it’s completely geared towards programming.
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Curious if you want to be specific about what you ran into, because I've had good experience with Opus class models for at least the last ~10 months and have gone through probably 200-300 million tokens in that time, i.e. not a small amount of use.

This is better than current versions of Opus (when it isn't flagging me or itself).
 
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turbineseaplane said:
Keep pumping ... gotta keep that juice flowing for the pre-crash IPO and continue workign on duping folks into accepting polluting, resource sucking, data centers in their back yard that provide like "50 jobs" post construction.

📈
💥
📉
Click to expand...
Especially with competition and how quickly AI is progressing. It seems like OpenAI and Anthropic are playing tag every month. Google isn’t far behind with its resources, that and other companies joining the race, as well as open source options all equals high volatility.
Fun times ahead 😏
 
“trained on all the latest code produced by the prior model and pushed to Git over last few months…….on the bro llm metrics chart, it scores itself 11, as trained.”
 
DrJR said:
“trained on all the latest code produced by the prior model and pushed to Git over last few months…….on the bro llm metrics chart, it scores itself 11, as trained.”
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Fable and Mythos = We've run out of human content to train on, so we're making up our own?


PowerButton said:
Especially with competition and how quickly AI is progressing. It seems like OpenAI and Anthropic are playing tag every month. Google isn’t far behind with its resources, that and other companies joining the race, as well as open source options all equals high volatility.
Fun times ahead 😏
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Google is the only company that doesn't have to worry about making an entire profitable business off AI while Anthropic and Open AI keep converting more money than they make to noise and heat. IMO the AI game is Google's to loose. At some point Open AI and Anthropic will have to charge the true cost of tokens + markup and Google should be able to outlast them in keeping costs controlled.

Also, we're rapidly approaching the line where on-device models will be able to do the vas majority of what the average person needs/wants from AI. I think at some point that will eat into the people willing to pay a $20-$40/mo level subscription.
 
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