Anthropic engineer: “Opus 5 is already smarter than we know how to use.
The bottleneck was never the model. It’s you.” In 19 minutes he shows how to get everything out of Claude — no extra tools, no extra cost. You’re already paying for it. Most people use maybe 10%. Watch
Fable 5.1 has a few details worth paying attention to
45% cheaper — but most of the reduction comes from cache reads, while input/output pricing barely changed. • Invisible watermarks — model outputs now include hidden watermarking. • Anti-distillation restrictions — newly
GPT-5.6 Sol / Terra / Luna + Codex, Veo 3.1 + Gemini Omni 1.1 Flash, Gemini 3.7, Grok 4.6
Claude Fable 5.1 / Mythos 5.1 + Opus 5 / Sonnet 5, DeepSeek V4 Pro/Flash out, Kimi, Cursor, Windsurf, Gemini Notebook, + cloud computer, AlphaEvolve GA on Google Cloud.
[Verification] Fable 5.1 is also amazing, but when you compare it, you can also feel that Opus 5 is superior.
I asked Fable 5.1, Opus 5, GPT-5.6 Sol, and Gemini 3.1 Pro to create a Pythagoras device by giving the same prompt only once. This is a physics simulation in which nine devices fire in sequence. ・Opus
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