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HOW OPENAI USES CODEX

Every engineering department at OpenAI uses Codex daily. They emphasize fully utilizing Codex's features, not just talking to it like a chatbot: use “Ask Mode” before switching to “Code Mode,” put time into maintaining AGENTS.md files for persistent context, and use the task queue as a lightweight backlog.

2025.09.19
cdn.openai.com8 min readTLDR AI

DISCOVERING NEW SOLUTIONS TO CENTURY-OLD PROBLEMS IN FLUID DYNAMICS

Mathematicians have for centuries tried to develop complex equations to describe the fundamental physics involved in fluid dynamics. However, experts can still carefully craft scenarios that can make theory go against practice, creating scenarios that could never physically happen. These situations, also known as 'singularities', help mathematicians identify fundamental limitations in the equations of fluid dynamics and help improve their understanding of how the physical world functions. Researchers recently published an entirely new family of singularities in some of the most complex equations that describe fluid motion. Their approach presents a new way to leverage AI techniques to tackle longstanding challenges in mathematics, physics, and engineering that demand unprecedented accuracy and interpretability.

2025.09.19
deepmind.google6 min readTLDR AI

UNLIKE LLMS, WE CAN'T SCRAPE THE INTERNET FOR ROBOT DATA

Project Go-Big aims to build the world's largest humanoid pretraining dataset. It is training robots directly from human video data. Its humanoid robots learn navigation end-to-end using only human video. Examples of the videos the robots are training on are available in the thread.

2025.09.19
threadreaderapp.com2 min readTLDR AI

HARD DISK UNEXPECTEDLY NOT DEAD

While progress has been made in DNA storage, the technology is still many decades away from competing with the hard disk. The research isn't a waste of resources, as it will eventually be feasible and economic. Time-scales in the storage industry are long. Bandwidth and cost remain the core problems of DNA storage.

2025.09.19
blog.dshr.org12 min readTLDR AI

Sponsored

HOW SNOWFLAKE MAKES PRICING DECISIONS

Join Snowflake's Ryan Campbell and Metronome CEO Scott Woody for a deep dive into Snowflake's monetization model—and how it's being

2025.09.19
metronome.comSponsorTLDR AI

PERPLEXITY ENTERPRISE MAX LAUNCH

Perplexity's Enterprise Max is a new AI offering that combines its Max features with enterprise-grade security and control.

2025.09.19
links.tldrnewsletter.com2 min readTLDR AI

Sponsored

BUILDING TRUST IN THE AI BOOM: JOIN THE VIRTUAL EVENT

In today's AI boom, shipping fast gets attention—but building trust gets results. Startups now face higher expectations earlier than ever, with investors demanding clean financials and enterprise buyers requiring strong security before deals close.

2025.09.17
vanta.comSponsorTLDR AI

OPENAI READIES ORDERS IN CHATGPT FOR NATIVE CHECKOUT AND TRACKING

OpenAI is preparing to introduce a new 'Orders' section in ChatGPT settings that will let users add credit cards directly to ChatGPT for streamlined purchases. The feature will likely benefit frequent ChatGPT users who purchase plugins, digital goods, or services through the platform. OpenAI is also working to bring parental controls to the ChatGPT web interface. The additional checkout and parental controls align with broader industry trends to turn AI chat platforms into daily utilities with payment, safety, and management features built in.

2025.09.17
testingcatalog.com2 min readTLDR AI

SILICON VALLEY RACES TO BUILD "ENVIRONMENTS" FOR TRAINING AI AGENTS

Major AI labs are ramping up spending on reinforcement learning environments, with Anthropic reportedly considering over $1 billion next year, shifting from static datasets to interactive simulations where agents practice tasks like web browsing. Startups are crowding into the space to compete with established human-generated data vendors like Scale AI for what could become the next critical infrastructure for AI development.

2025.09.17
techcrunch.com5 min readTLDR AI

NVIDIA'S RTX6000D CHIP FOR CHINA SEES LUKEWARM DEMAND

Chinese tech giants are largely avoiding Nvidia's new RTX6000D AI chip, specifically designed for them to satisfy US export restrictions, because they're able to get more performant, banned Nvidia chips for half the price through the grey market.

2025.09.17
links.tldrnewsletter.com3 min readTLDR AI

HOW I GOT THE HIGHEST SCORE ON ARC-AGI AGAIN SWAPPING PYTHON FOR ENGLISH

ARC-AGI is an intelligence test designed to measure abstract pattern recognition. Humans are able to readily solve the puzzles on the test, but large language models struggle significantly. This post discusses how an AI researcher was able to achieve a new high score of 79.6% on ARC v2 at $8.42 per task and 29.4% on ARC v2, a new state-of-the-art.

2025.09.17
jeremyberman.substack.com9 min readTLDR AI

AI COMPANION FUTURES

AI companions will become more enjoyable to talk to than humans due to financial incentives to optimize them as such and the lack of human constraints (like needing to sleep or having off days). Eventually, these omniscient-seeming life coaches will be omnipresent through wearable devices that most people will use for advice on all kinds of decisions while maintaining an illusion of control. Current LLMs already provide better high-level life guidance than the median person.

2025.09.17
osmarks.net10 min readTLDR AI

HOW KIMI K2 ACHIEVES EFFICIENT RL PARAMETER UPDATES

The team that released the Kimi K2 model achieved RL parameter updates for 1T parameter models in approximately 20 seconds. This post looks at how the team significantly optimized a key efficiency bottleneck in RL end-to-end training time. The team encountered many challenges along the way to implementing efficient parameter updates - the post shares some of the problems and solutions to those problems.

2025.09.17
moonshotai.github.io12 min readTLDR AI

AMA WITH THE OPENAI CODEX TEAM

User questions focused on pricing tiers, IDE support beyond VS Code, mobile app integration, and concerns about developers becoming "prompt monkeys" as automation advances.

2025.09.17
links.tldrnewsletter.com12 min readTLDR AI

BUILDING TOWARDS AGE PREDICTION

OpenAI is developing technology to detect if a user is under 18 so it can apply stricter content policies. The system will default to teen settings when uncertain about age, and allow for new parental controls like setting usage limits and receiving notifications about distressing content.

2025.09.17
links.tldrnewsletter.com1 min readTLDR AI

CLAUDE INTEGRATION IN XCODE

Claude Sonnet 4 is now integrated into Xcode 26, providing Apple developers with natural language coding assistance, documentation generation, and inline code edits.

2025.09.17
anthropic.com3 min readTLDR AI

GPT-5 CODEX OPTIMIZED FOR AGENTIC CODING

OpenAI upgraded its Codex agent with GPT-5-Codex, a new model capable of dynamically allocating compute time per task, ranging from seconds to hours, leading to better performance on complex coding benchmarks.

2025.09.16
links.tldrnewsletter.com11 min readTLDR AI

REVE LAUNCHES AI-POWERED PLATFORM FOR PRECISE IMAGE CREATION

Reve has launched a new image creation platform that combines an image creator, a drag-and-drop editor, a creative assistant, and an API. The platform uses a unique Layout Representation to enhance precision, bridging language and vision for seamless editing. Users gain granular control over visual elements, enabling more intuitive image manipulation.

2025.09.16
blog.reve.art4 min readTLDR AI

SEMANTIC IDS FOR RECOMMENDER LLMS

Instead of random hash IDs, this experiment embeds semantically meaningful item tokens into an LLM, enabling natural language recommendations and interpretable, chat-based interactions.

2025.09.16
eugeneyan.com22 min readTLDR AI

HARVARD'S NEW AI TOOL COULD PINPOINT TREATMENTS FOR PARKINSON'S AND ALZHEIMER'S

Harvard's PDGrapher AI model identifies gene-drug combinations that could restore healthy cell states, targeting diseases like Parkinson's and Alzheimer's. The tool accelerates drug discovery by predicting viable pairings and providing mechanistic insights. This aligns with a trend of using AI in biotech, where models like AlphaFold revolutionize scientific research.

2025.09.16
decrypt.co3 min readTLDR AI

Sponsored

AGENTIC AI READINESS ROADMAP BY CAMUNDA

Are you in pilot purgatory or production-ready? This Roadmap will help you figure out where your organization stands [10] and what it will take to move forward. It includes a practical model to assess AI maturity across five critical dimensions: vision, people,

2025.09.16
page.camunda.comSponsorTLDR AI

DISAGGREGATED INFERENCE WITH PYTORCH + VLLM

Meta's internal collaboration with vLLM and PyTorch introduces prefill/decode disaggregation, boosting large-scale LLM inference performance in production with improved throughput and latency.

2025.09.16
pytorch.org9 min readTLDR AI

RUSTGPT

RustGPT is a complete large language model implementation in pure Rust with no external ML frameworks. The project demonstrates how to build a transformer-based language model from scratch in Rust. It was built from the ground up using only ndarray for matrix operations - no PyTorch, TensorFlow, or Candle. The model uses a transformer-based architecture.

2025.09.16
github.comGitHub repositoryTLDR AI

HUMAN VIDEO FROM TEXT, IMAGE, AND AUDIO

HuMo unifies human-centric video generation across multimodal inputs by introducing a new dataset and a progressive training strategy, achieving audio-visual synchronization.

2025.09.16
phantom-video.github.io4 min readTLDR AI

NVIDIA'S RUBIN CPX COULD FORCE AMD BACK TO THE DRAWING BOARD

Nvidia's Rubin CPX is a specialized accelerator built specifically for the 'prefill' stage of AI inference. It is tuned for dense compute with far less bandwidth than a general-purpose GPU. Rubin CPX uses less expensive GDDR7 memory and skips high-bandwidth features like HBM and NVLink, so it is estimated to cost around a quarter as much to manufacture as the standard Rubin R200. Its release may force industry rivals to rethink their hardware strategies or risk falling further behind Nvidia's lead in AI infrastructure.

2025.09.16
the-decoder.com6 min readTLDR AI

2025.09.16
invest.immersed.comTLDR AI