Claude Fable 5.1: 7 Essential Facts and 3 Breaking Changes
Claude Fable 5.1 kept the same price and cut cache reads 75%. The three breaking changes, the 3.2x effort-tier spread, and who should switch.
Otmane Hammadi
Otmane Hammadi is a senior full-stack developer and data and AI specialist. He writes about local AI hardware, LLM tooling and open-source infrastructure at AI Foundation Tools, testing and researching every piece of hardware and software covered on the site.
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ComfyUI 2026: the Comfy Desktop overhaul, AMD ROCm on Windows, NVFP4 performance, and the snapshot limitation the docs got wrong.
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Building an AI voice agent in 2026 — the latency budget that decides everything, cascade vs speech-to-speech, real costs, and common mistakes.
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10 proven LLM API cost optimizations for 2026, in priority order — prompt caching, batching, routing, and a realistic 90-day timeline.