The Daily Index — Wednesday, September 30, 2026

Repositories, courses and useful tools

Resources & Tools

TLDR · GitHub repository

LEMMA

Lemma is an open-source workspace where humans and AI agents work as one team. State is shared and permissioned, so many people and many agents work on the same records. It keeps running between sessions, on schedules, webhooks, and table events, and it improves as teams work with it. Lemma can be run locally or on Lemma Cloud.

github.com

TLDR Dev · Tool

GPT-6.1 SOL

GPT-6.1 Sol targets near-Astra performance on coding, computer use, and professional work at one-fifth of Astra's standard token prices. It improves on GPT-6 Sol by 6.4 percentage points on DeepSWE 1.1 and is priced at $2 per million input tokens and $10 per million output tokens. The model is available in the API, ChatGPT Work, and Codex, with an Ultrafast tier planned.

links.tldrnewsletter.com

TLDR Dev · Tool

DEVDAY 2026 RECAP

DevDay introduced dots, GPT-6.1 Sol, faster inference, cloud Codex environments, a refreshed CLI, code review, and Codex Security Cloud. The developer platform also gained a Decisions API for bounded classifications and an Agents API with computer use, multi-agent orchestration, tool search, and context compaction.

links.tldrnewsletter.com

TLDR Dev · Tool

INTRODUCING DOTS

Dots are always-on GPT-6 Astra agents with their own cloud computers, connections to more than 4,000 apps, and access through ChatGPT, Slack, Teams, and voice.

links.tldrnewsletter.com

TLDR Dev · GitHub repository

LIVENERF

livenerf is a preregistered benchmark that runs a pinned Claude Code harness daily to detect post-launch model capability changes while controlling for harness updates and usage shifts.

github.com

TLDR InfoSec · GitHub repository

CRYPTOPTIC

cryptoptic is a tool that uses CodeQL, orchestrated via GitHub Actions, to scan a repository or entire GitHub organization and produce an inventory of every cryptographic function in use, the library it comes from, and when it gets called.

github.com

TLDR Design · Tool

SHADCN MARKETING BLOCKS AND SKILLS FOR AI AGENTS

Initium gives your AI agent the style, strategy, blocks, and skills to generate a site that looks designed, not generated.

app.initium.sh

TLDR Design · Tool

PRODUCT ONBOARDING: 100+ REAL EXAMPLES, PATTERNS, AND BEST PRACTICES

A curated library of real product onboarding examples from Notion, Slack, Stripe, Cal, and more. Patterns, components, and the activation playbooks that move retention.

productonboarding.com

TLDR Design · Tool

DESIGN BATTLES

Free online design battles in real time, with the same brief and kit for every entrant.

designbattle.hubmonster.io

TLDR Founders · Tool

OPENAI DEVDAY 2026

OpenAI introduced on DevDay new models, tools, and agents to help developers build faster, take on more ambitious projects, and bring their products to more people. The company revealed new agents that can take on ongoing responsibilities and new ways for people and AI to work together. It also expanded its commitment to an open ecosystem by opening up ChatGPT as a shared surface where humans and agents can collaborate and where developers can directly launch new native experiences. There is now a new Pro 500 plan that offers 25 times the ChatGPT Plus allowance and includes access to Ultrafast.

links.tldrnewsletter.com

TLDR DevOps · GitHub repository

PAGEINDEX

PageIndex replaces vector indexes with a hierarchical tree index that allows LLMs to reason through documents like a human expert. The tool achieved 98.7% accuracy on FinanceBench, outperforming vector-based RAG.

github.com

TLDR DevOps · GitHub repository

OPENSHELL

OpenShell is an Apache-2.0 runtime for running autonomous agents inside isolated sandboxes with kernel-enforced filesystem, syscall, and network policies. Credentials are injected only for approved endpoints, while proposed policy changes are formally checked before they are applied. The platform also supports Kubernetes deployment, GPUs, and Python, TypeScript, Go, and Rust SDKs.

github.com