How is Lumis different from Substack Bulletin?

Lumis synthesizes multiple AI/tech research sources (Hacker News, arXiv, The Batch, Latent Space) into a single daily briefing delivered to your inbox. Substack Bulletin focuses on Substack's answer to Beehiiv and modern newsletters. Lumis works passively — you receive your briefing each morning — while Substack Bulletin requires more active engagement.

What does Lumis cost?

Founding members lock in at $9/mo — a fraction of most comparable services. That's 499 of the first 500 founding spots remaining before pricing increases.

Does Lumis cover the same sources as Substack Bulletin?

Lumis synthesizes Hacker News, arXiv cs.AI, deeplearning.ai (The Batch), and Latent Space — the original research signals, not newsletter summaries of them. If Substack Bulletin covers these sources, Lumis brings them together into one ranked, AI-synthesized briefing.

Lumis vs Substack Bulletin

Which AI research tool saves your time? Compare features, depth, and pricing.

Feature	Lumis	Substack Bulletin
Covers original sources, not newsletter commentary	✓	✗
One briefing, multiple sources, LLM synthesis	✓	✗
Shareable /i/:slug URLs + community ranking	✓	✗
AI impact labels on every item	✓	✗
Covers Substack posts, newsletters, and platform news	✗	✓
Weekly newsletter featuring top Substack posts	✗	✓
Free for all Substack readers and writers	✗	✓

Live sample briefing

What you receive in your inbox each morning — today's actual Top 3

Today's top 3 — Lumis

Monday, August 24, 2026

risk

Safety alignment is superficial: LLMs hide harmful intent in latent space, bypassing refusal triggers

Refusal-based guardrails don't block harmful intent encoded in latent space—deployed LLMs need deeper probing now.

opportunity

Nexus cuts agentic LLM prefill cost by splicing KV-cache across turns on MCP tool registries

Nexus reduces prefill costs at scale for MCP tool registries—direct TTFT gains for production agentic pipelines.

shift

Qwen 3 8B/27B completes a real reverse-engineering task in 30 minutes, rivaling frontier models

Frontier-level RE capability now runs locally under 30B params, forcing security teams to rewrite attacker threat models.

Lock founding price → See full sample

If you currently use Substack Bulletin

What changes with Lumis: Lumis brings the AI research signal upstream — HN, arXiv, The Batch, Latent Space — before it becomes newsletter content.

What Substack Bulletin does better: Substack Bulletin is Substack's own featured newsletter surfacing trending posts and platform-wide updates for Substack writers and readers.

Comparison searches are the warmest intent on the web — you're mid-evaluation, not browsing casually. Lumis is built for the researcher who wants the signal without the overhead. Lock the founding price before the first 500 spots fill.

⚡ Founding member pricing