“Cognition announced Fusion in Devin CLI, an efficient frontier harness for Fable and Astra that lets users select separate models for planning and cost-effective execution.”

#1 𝕏 Cognition announced Fusion in Devin CLI, an efficient frontier harness for Fable and Astra that lets users select separate models for planning and cost-effective execution. Cognition claims it is 39% cheaper across coding benchmarks. Also covered by: @Cognition #2 📝 OpenAI News Rapidly scaling online storage to serve over 1 billion ChatGPT users - An engineering deep dive into scaling online storage systems to support over one billion ChatGPT users, describing architecture and operational approaches used to meet massive scale and reliability needs.

“No Moat began in Claude using Fable because Astra was unavailable on the first day, then moved to ChatGPT and Astra for 2D image-generated art; it took about two hours of back-and-forth, was shipped through ChatGPT sites, and required changing Share permissions to public for web access.”

#3 ▶️ GPT 6 Astra is the Best Model for Building Games (4 Real Examples) Peter Yang GPT Astra, Blender MCP, and GDAU MCP were used to create four games: a Star Fox-style space shooter, the moving-train FPS Dust Line, the StarCraft-style RTS level Ashvall, and the roguelike deck builder No Moat. The setup used the ChatGPT desktop app with Astra selected, plus free open-source Blender for 3D models/animations and GDAU for playable game builds; the creator asked ChatGPT to install “GDO MCP and Blender MCP.” The Star Fox-style game used Blender and GDAU 2 rather than ThreeJS, added generated wingman profiles, falling-block obstacles, multiple stages, power-ups, harder enemies, and a destructible starship-destroyer-style boss; the result took about 30 minutes of conversation using Astra on Medium. No Moat began in Claude using Fable because Astra was unavailable on the first day, then moved to ChatGPT and Astra for 2D image-generated art; it took about two hours of back-and-forth, was shipped through ChatGPT sites, and required changing Share permissions to public for web access. Also covered by: @AI Explained , @Fireship , @Peter Yang , @Sam Altman

“Boris Cherny said his unspecified group uses the same exact Fable and is working to reduce cybersecurity refusals.”

GenAI PM Daily August 25, 2026 GenAI PM Daily 🎧 Listen to this brief 3 min listen Today's top 19 insights for PM Builders, ranked by relevance from Blogs, YouTube, and LinkedIn. GPT-5.6 in Kiro advances developer price-performance #1 📝 OpenAI News Advancing price-performance for developers with GPT‑5.6 in Kiro to improve price-performance for developers, enabling more cost-effective and performant model access for applications. #16 𝕏 Boris Cherny said his unspecified group uses the same exact Fable and is working to reduce cybersecurity refusals.

“New Fable safeguards for enterprises are being launched to run on enterprises’ infrastructure, providing control over where data lives and who can access it.”

#17 𝕏 New Fable safeguards for enterprises are being launched to run on enterprises’ infrastructure, providing control over where data lives and who can access it. Developed alongside approximately 100 companies, the safeguards are hoped to roll out more broadly in the fall.

“#10 𝕏 Boris Cherny asked whether Claude should automatically resume using Fable after a user’s limit resets or pause and let the user decide each time.”

GenAI PM Daily August 09, 2026 GenAI PM Daily 🎧 Listen to this brief 3 min listen Today's top 10 insights for PM Builders. Claude Code sessions can now message each other #10 𝕏 Boris Cherny asked whether Claude should automatically resume using Fable after a user’s limit resets or pause and let the user decide each time.

“Boris Cherny uses Fable’s dynamic workflows and a profiler to iteratively tune his code until the p95 latency drops below 300 ms.”

#15 𝕏 Boris Cherny uses Fable’s dynamic workflows and a profiler to iteratively tune his code until the p95 latency drops below 300 ms. #16 in Colin Matthews suggests kickstarting AI email writing by first defining a clear “good email” rubric—using an LLM to extract criteria from sample emails—and then iterating on drafts against that rubric rather than endless ad-hoc edits.

“Peter Yang points out that Fable excels at planning while GPT shines in execution. He also warns that Fable tokens are expensive and limited.”

#18 𝕏 Peter Yang points out that Fable excels at planning while GPT shines in execution. He also warns that Fable tokens are expensive and limited.

“How to generate UI with Fable, Claude Design, GPT-5.6 #1 𝕏 Sam Altman reports physicians found fewer flaws in GPT-5.6’s responses than in physician-written answers, underscoring the model’s enhanced medical reliability.”

GenAI PM Daily July 12, 2026 GenAI PM Daily 🎧 Listen to this brief 3 min listen Today's top 18 insights for PM Builders, ranked by relevance from X, YouTube, and Blogs. How to generate UI with Fable, Claude Design, GPT-5.6 #1 𝕏 Sam Altman reports physicians found fewer flaws in GPT-5.6’s responses than in physician-written answers, underscoring the model’s enhanced medical reliability. Also covered by: @Fireship , @Jason Zhou #2 ▶️ A Model Explosion: GPT 5.6 Sol, Grok 4.5 and Meta Muse Rewrite the Rules AI Explained GPT-5.6 Soul achieves a 54% top score on the UC Berkeley–led Agent’s Last Exam benchmark, outperforming Claude Fable’s 45% at roughly one-third of the cost. Agent’s Last Exam covers 55 industries with tasks crafted by 300 experts; GPT-5.6 Soul scores 54% versus Claude Fable’s 45%, costing ~33% of Fable’s usage fees. On Zapier’s Automation Bench for end-to-end workflows across sales, marketing, operations, support, finance, and HR, GPT-5.6 Soul leads Claude Fable by 0.7% at nearly equivalent cost per call. Meta Muse Spark 1.1 achieves 72% on the independent VIBE Code Bench at approximately 35× lower cost compared to GPT-5.6 Soul’s 81% code completion score. Also covered by: @Fireship , @Jason Zhou #3 📝 Surge AI Blog Anthropic cited GDP.pdf and Riemann-bench in their Fable 5 and Mythos 5 system card - Notes that Anthropic referenced two Surge AI benchmarks (GDP.pdf and Riemann-bench) in their Fable 5 and Mythos 5 release, and discusses the importance of expert-built evaluations at the frontier. The post analyzes why such benchmarks matter for evaluating frontier models. #4 𝕏 Peter Yang used Fable to generate a plan.html with design guidelines, leveraged Claude Design to craft UI components and screens, then tasked GPT-5.6 with building the project. #5 𝕏 Sebastian Raschka refreshed his LLM benchmarks with Grok 4.5 and Meta’s Muse Spark 1.1, showing Grok 4.5 on the Pareto frontier for best bang-for-buck and added harness details. #6 📝 Surge AI Blog GDP.pdf Benchmark: Can Frontier Models Master the Documents that Run the World? - Presents GDP.pdf, a professional multimodal reasoning benchmark using real-world prompts and PDFs from enterprise workflows to test frontier models on mastering critical documents. The benchmark gauges models' ability to handle practical document understanding tasks. #7 𝕏 Harrison Chase launched LangSmith, offering cloud-based sandboxes & deployments, deep‐agent orchestration, and observability tracing. It integrates with hundreds of LangChain models and powers recursive improvement via the LangSmith engine. #8 𝕏 Aravind Srinivas argues that delivering durable value in agentic AI production hinges on a secure, compliance-ready multi-model harness—exemplified by Perplexity Computer’s orchestration and model-routing framework. #9 𝕏 Jason Zhou launched a local daemon that runs AI agents directly on your computer with full context, while Loopany handles the orchestration. #10 𝕏 Alexandr Wang unveils Muse Spark, an AI model that carries out end-to-end tasks from just short video instructions. #11 𝕏 Shreyas Doshi warns that analogies excel at explaining your finished thinking but mislead when used to guide decisions—they’re maps you draw after the journey, not tools to navigate it. #12 𝕏 Sam Altman says AI has been net job-creating so far—surprisingly given its current capabilities—and he believes this trend may continue. #13 𝕏 Santiago predicts AI video will shift from static clips to real-time, interactive livestream-style experiences (think Minority Report–style personalized ads) and shares a demo link showcasing this early potential. #14 𝕏 Teresa Torres When AI labs shipped DIY image generators, Snapbar feared losing its edge—but as clients experimented, they demanded richer, branded outputs (logos, custom scenes, names), making Snapbar’s event expertise more valuable than ever. #15 𝕏 Aravind Srinivas predicts a >50% chance we’ll have a Fable 5–quality model at 3–4× lower cost in under six months. He also expects an Opus 4.8–grade model to run locally on devices within a year. #16 𝕏 Harrison Chase announces the LLM Wiki Webinar with Brace Sproul, Dev Stein, and Jeffrey Huber is now on YouTube. They explore using wikis as a cache for frequently accessed info and argue that hyperlinked pages—rather than nested files—are key to scaling knowledge. #17 𝕏 Sebastian Raschka advises that subscribers not hitting usage caps should stick with a familiar model and simply toggle the effort (inference scaling) level, since you benefit from knowing a model’s quirks. #18 𝕏 Peter Yang points out that Fable excels at planning while GPT shines in execution. He also warns that Fable tokens are expensive and limited.

“Anthropic's Thariq Shihipar announces Fable is rolling out and demonstrates "capability overhang" by showing Claude Code fetch a Pokémon list and filter for names ending in aw—Croconaw and Drednaw—when ordinary chat models fail.”

#16 📝 Mario Zechner Field Guide to Fable — Thariq Shihipar, Anthropic - Anthropic's Thariq Shihipar announces Fable is rolling out and demonstrates "capability overhang" by showing Claude Code fetch a Pokémon list and filter for names ending in aw—Croconaw and Drednaw—when ordinary chat models fail. He says Claude Code cut 80% of its system prompt, the ask‑user‑question tool went from barely working under Opus 4 to generating embedded HTML questionnaires under Fable, he built a full keynote deck in four hours, and urges teams to demand good, fast, and cheap.

“in Peter Yang shares a three-step workflow to maximize Fable before July 7—prep with cheaper LLMs, plan in Fable and execute with another model, then assign medium-effort tasks with a bit of oversight—and links to a tutorial on five practical Fable use cases.”

#5 in Peter Yang shares a three-step workflow to maximize Fable before July 7—prep with cheaper LLMs, plan in Fable and execute with another model, then assign medium-effort tasks with a bit of oversight—and links to a tutorial on five practical Fable use cases. #6 in Omon Eni spotlights Carl Vellotti’s free, five-module course that turns Anthropic’s Claude Code into a hands-on PM operating system. PMs clone a repo, open their terminal, and in three steps learn by doing—writing PRDs, running data analysis, and building strategy docs.