Loop engineering is REAL. It’s not about picking the best model. It’s the loop you build on top that compounds. Private Evals are about to be HUGE. Score models on your outcomes and your traces, not a public leaderboard. Your EVALS are your moat.

Introducing the Fusion API, the smartest compound model in the market. Fusion achieves Fable-level intelligence at half the price. How it works 👇

mastra has hit 1 million weekly downloads 📈📈📈

We are in a new world...

Everything we've learned in 2026 over thousands of hours building our agent harness:

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It's finally out!!! @METR_Evals found that more than half of SWEBench results is unmergeable slop. FrontierCode represents over 1000 hours of maintainer validated software engineering work most frontier models cannot yet solve, much less solve with high quality. Cog had IOI Gold medalists and top code maintainers Look At The Data — FrontierCode includes 3000 rubrics covering code quality and anticheat reward hacking plaguing other benchmarks. FC Diamond is so hard that Opus 4.8 scores 13.8%. Three eras of AI coding : Three eras of benchmarks 2021 • Autocomplete : HumanEval 2023 • Passing Tests: SWEBench, TerminalBench 2026 • Maintainable Code: FrontierCode to me the most beautiful chart when I requested a special historical run into all extant old models, the data was finding that the easiest third of FC tasks (in FC Extended) were rapidlly and suddenly solved over late 2025 - Opus almost doubled from a 41% pass rate to 74% in 4 months. This describes the "WTF happened in Dec 2025" vibe shift that a lot of folks from @dhh to @karpathy have called out: it is the difference between getting 95% success in 2 rerolls vs 6, making it finally feasible to go up the next layer of abstraction in agentic coding, eg @GeoffreyHuntley's ralph loops or @bcherny's /goals or @steipete's "loops that prompt your agents" without fearing too much that things go off the rails. My guess: as AI accelerates from here, each FrontierCode tier will saturate in sequence, hopefully ~annually. I've already asked the team to prepare FrontierCode 2027.... The old mountains will be destroyed. Their rubble becomes regolith. And from that regolith, the next model forest grows. Circle of life.

🚨 SpaceX vale más que toda la industria aeroespacial occidental junta. Una empresa contra doce gigantes con décadas de historia. 🔴 GE Aerospace RTX Boeing Airbus Safran Honeywell Rolls-Royce Lockheed Martin BAE Northrop y compañía: 1,74 billones de dólares

I must say the stochastic nature of working with agents by far the worst. Yesterday, I could describe my problem and it would implement it near minimal changes. Today I describe my problem and it rampage throughout my whole codebase...