Opus is nowhere close to Fable. Fable feels at least one generation ahead to me. https://x.com/hyperagentapp/status/2064396004032463157
Edit: OpenAI will launch a similar model soon and I can't wait. We are entering a new era of agents.
Fable is very much an incremental development over Opus, and even more incremental when properly compared to its existing counterparts GPT-Pro and Gemini Deep Research.
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Models are spiky. In some narrow domains (cybersecurity, for instance) it will be a generation ahead. On the other hand a lot of people don't see a measurable difference between Opus ~4.5 and 4.6/7/8, because Anthropic taught it how to do some hard stuff better, but they didn't give it better taste or make it produce cleaner solutions to simpler problems.