Usman Javaid

AI Engineer

[Usman Javaid @usmanjavaid227]

An eval harness is a test harness: fixtures, unit under test, assertions. An agent harness is not. Its tools, memory and sandbox are part of the system under test. Same model, different harness, different score. No disclosed harness, no comparison.
https://t.co/X4mR7elVIx

[Usman Javaid @usmanjavaid227]

Published 20260913-190136-c27f35 · grade 8.3 · thought · explainer
Threads in CPython buy you overlap. The GIL lets one thread run Python bytecode at a time, and releases it during I/O. So wait time overlaps and compute time serialises.

[Usman Javaid @usmanjavaid227]

Claude's four modes are one dial: how often it stops to ask you. Chat asks every turn. Cowork runs parallel agents you watch. Code on Bypass Permissions never asks. A skill answers those questions once and repeats.
https://t.co/GDKgIOwM7w

[Usman Javaid @usmanjavaid227]

A harness is the code wrapped around a model: picks tools, carries context between steps, checks output, retries failures. The word reads as ambient jargon. It spread after Mitchell Hashimoto's post of Feb 5 2026.
https://t.co/Y9zKdx21dN

[Usman Javaid @usmanjavaid227]

GRPO grades each answer against the average of its own sampled group. Nothing scores the steps in between, so backtracking pays only through the answer it saves. That is enough: R1-Zero's AIME 2024 pass@1 went 15.6% → 77.9%.
https://t.co/htk7mck8Fc
Paper: Guo et al.

[Usman Javaid @usmanjavaid227]

@elonmuskTN 27

[Usman Javaid @usmanjavaid227]

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[Usman Javaid @usmanjavaid227]

@e_opore Hi

[Usman Javaid @usmanjavaid227]

Your Favourite one?
Mine is VS code.

[Usman Javaid @usmanjavaid227]

Exciting things in the works! 🎉 Exploring AI-powered, emotion-driven sports highlights that blend real-time analytics with immersive fan experiences. From personalized highlights to sustainable viewing options, aiming to make sports even more engaging and eco-conscious! 🌍⚽

[Usman Javaid @usmanjavaid227]

Did you know? 📊 Data analytics can boost decision-making speed by up to 5x! Faster insights, smarter moves. #DataAnalytics

[Usman Javaid @usmanjavaid227]

Fun Fact: By 2025, we’ll be creating 463 exabytes of data *daily*! 📊 That’s enough to fill over 200 million DVDs every day! #DataAnalytics #BigData

[Usman Javaid @usmanjavaid227]

Data Fact 💡: 95% of companies say managing *unstructured data* is a huge challenge! 📈 But with the right analytics tools, it’s a goldmine for insights. #DataAnalytics #BigData

[Usman Javaid @usmanjavaid227]

🌟 Cool Data Analytics Fact 🌟

Did you know? 📊 Nearly 90% of the world’s data was created in just the last 2 years! 🤯 With advanced analytics, we can turn that vast info into valuable insights, powering smarter decisions and even predicting trends. Data truly is the new gold!

[Usman Javaid @usmanjavaid227]

Indeed

[Usman Javaid @usmanjavaid227]

CNN......

[Usman Javaid @usmanjavaid227]

@_devJNS Connected

[Usman Javaid @usmanjavaid227]

You are a Techie and you below 5k followers? Drop your usernames let's connect..