Fable 5.1 — Anthropic Finally Listened? @engineerprompt

Uploaded September 2026 | Updated September 2026, 2 weeks ago

In this video, I break down Anthropic’s new Claude Fable 5.1 release, including its improved token efficiency, benchmark results, and what the new cache-read pricing means for real-world costs.

LINKS:
anthropic.com/claude-fable-and-mythos-5-1
pbs.twimg.com/media/HRJoa2QWIAAAOJX?format=png&name=4096x4096
https://x.com/cognition/status/2094849472119374145
pbs.twimg.com/media/HRJ4-32XgAAkK3P?format=jpg&name=4096x4096
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$DeepSeek V4 Flash: The Best Open Model You can Actually Run! DeepSeek V4 Flash (Official) Runs Locally: Benchmarks, Cost, and DGX Spark Setup I test the official DeepSeek V4 Flash (July 31 edition) running entirely locally and break down DeepSeek’s released benchmarks, where it beats the prior V4 Pro/Flash preview and even outperforms larger models like GLM 5.2, while approaching Opus 4.8 for a fraction of the size. I also explain why benchmark harnesses matter (including DeepSeek’s agent harness and an OpenAI harness example) and highlight internal DS Bench results. I cover pricing (about $0.02/M input tokens and ~$0.30/M output tokens), token efficiency on the AI Index cost curve, and agentic coding results like Terminal Bench. Then I demo Open Code harness runs (Pokémon encyclopedia and an International Space Center tracker), show ~20–30 tok/s on two DGX Sparks in FP4, discuss the 1M context window, hardware/VRAM needs for 4-bit and 3-bit, and options like Dwarf Star for SSD offloading and mixed precision. Thanks to @NVIDIADeveloper for DGX Sparks. LINK: https://www.deepseek.com/en/ https://api-docs.deepseek.com/guides/responses_api/ https://github.com/antirez/ds4 https://x.com/UnslothAI/status/2083231049434435596 https://artificialanalysis.ai/#intelligenceDwarfStar https://x.com/stevibe/status/2083120066678464750 Video: https://youtu.be/9gHcmhUDJfw Long Running Agents: https://youtu.be/ju7R6jer6_M My voice to text App: whryte.com Website: https://engineerprompt.ai/ RAG Beyond Basics Course: https://prompt-s-site.thinkific.com/courses/rag Signup for Newsletter, localgpt: https://tally.so/r/3y9bb0 0:00 - Introduction to DeepSeek V4 Flash 0:55 - Shocking Benchmark Results & Performance Efficiency 0:2:42 - The Impact of Optimized Harnesses on Performance 0:4:23 - Pricing & The Pareto Frontier of Cost vs. Intelligence 0:5:04 - Running DeepSeek V4 Flash Locally 0:7:20 - Live Demo: Agentic Coding & Pokemon Encyclopedia Test 0:8:34 - Live Demo: ISS Tracker with Real-time UI 0:9:39 - Limitations: Text-only & Multimodal Alternatives 0:10:51 - Hardware Requirements for Local Setup 0:12:52 - Final Results & Summary$

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Fable 5.1 — Anthropic Finally Listened?