I tried Fable 5.1 right away. The animation is much smoother than opus and fable 5.

This will greatly improve the production of illustrated videos.

GENEL | リアルなAI動画制作Sep 13

After practicing breathing, Opus 5 worked on incorporating breathing into their depiction of fear

Here’s their construction of gasping and screaming

w̸͕͂͂a̷͔̗͐t̴̙͗e̵̬̔̕r̴̰̓̊m̵͙͖̓̽a̵̢̗̓͒r̸̲̽ķ̷͔́͝Sep 113

Anthropic has released Claude Fable 5.1.

The internals are the same model as Mythos 5.1, the only difference being the strength of the safety device. It is about 25% cheaper and more than twice as expensive as GPT-5.6 Sol for scientific research tasks. Although it may seem to be a matter of performance, the essence is the design of ``what is allowed to whom.'' Reactions overseas are divided in two depending on the severity of the safety measures.

AIヘッドラインSep 1

Claude Fable 5.1 shipped Sept 1.

Terminal-Bench-Science: 52.6% vs Fable 5's 24.7% — more than double. Beats Opus 5 (29.0%) on it too. Base pricing unchanged at $10/$50 per million tokens, but cache reads fell $1.00 -> $0.25, ~25% typical savings and up to 45% agentic.

Andrew DariusSep 1