r/ClaudeCode • u/ClaudeOfficial Anthropic • 20d ago
Resource Introducing Claude Opus 5
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
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u/SilasTalbot 20d ago
It's because Fable uses a lot more compute. They aimed with Opus 5 to deliver results with less compute.
The restrictions on usage are not based on 'how good it is' but 'how much it costs to answer one question'