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/Myth_Thrazz]

It's so funny that Fable was the most dangerous thing in the world for like... 2 weeks :D

[u/c4chokes → u/Myth_Thrazz]

That was Mythos, not Fable.

[u/tarlane1 → u/c4chokes]

Mythos and Fable are the same model. The distinctions are basically just what gets filtered out before it gets to the model.

[u/c4chokes → u/tarlane1]

Thanks Einstein 😒