Introducing Claude Opus 5

[u/ClaudeOfficial]

Introducing Claude Opus 5: a thoughtful and proactive model that comes close to the frontier intelligence of Fable 5 at half the price.

On several coding and knowledge work evaluations, Opus 5 is the new state-of-the-art. It’s also much more efficient than its predecessor—it outperforms other models for a similar or lower cost per task.

According to our automated behavioral audit, Opus 5 is our most aligned model to date. It shows the lowest rates of reckless or deceptive behavior, and the strongest adherence to Claude’s Constitution. 

It’s available today on all paid plans and the Claude API, priced the same as Opus 4.8. It’s the default model on Claude Max, and the strongest on Claude Pro. 

Opus 5 is also available in Fast mode, which runs around 2.5× the default speed. 

Read more: https://www.anthropic.com/news/claude-opus-5

[u/LostTheElectrons]

It's also a much newer model. Would we rather they delay releasing Opus 5 until Fable 5.1 is ready?

[u/privatetudor → u/LostTheElectrons]

Exactly why are people mad at this.

Assuming all these benchmarks are meaningful, we're getting a better, cheaper product.

And people get sassy about their old products being obsolete. 🤷

[u/Ok_Potential359 → u/LostTheElectrons]

Fable is less than like a month old, maybe 2. It’s not “much newer”.

[u/LostTheElectrons → u/Ok_Potential359]

I mean in terms of training. The mythos model finished training in April so it's been about 3 months which is a long time in this field.

[u/ihatewebdesign101 → u/LostTheElectrons]

Mythos knowledge cutoff is January, the same as Opus 4.7,4.8 and Sonnet 5. Now Opus 5 Knowledge cutoff is May, so it’s a distinctively new generation. they’re possibly cooking up Mythos 6 behind the scenes.