US Suspends Fable 5 & Mythos 5

Welcome to another edition of AI PlanetX.

US Govt suspends Anthropic Fable 5 and Mythos 5; Elon Musk becomes trillionaire via SpaceX debut; Meta AI unit faces backlash over transfers and monitoring.

• Hottest AI News

• Top AI & SaaS Tools

• AI Tutorial: Turn Reddit Into Viral LinkedIn Posts

• Top AI & Tech News

• AI Art Spotlight

• Prompt of the Day: Claude Fable 5 (Mythos) System Prompt

• Featured AI Video

• Course of the Day: AI and Machine Learning

Hottest AI News

Anthropic

US Government Suspends Anthropic Fable 5 And Mythos 5 After AI Warning

Anthropic just lost use of its most powerful AI models days after launch. The U.S. government ordered the company to suspend Fable 5 and Mythos 5, citing national security concerns.

Details:

• Fable 5 became a public Mythos-class model. Mythos 5 used the same core AI system with fewer safeguards for approved cyberdefenders through Project Glasswing and U.S. govt partners

• The directive targeted foreign nationals, including Anthropic staff inside the U.S. To stay compliant, Anthropic disabled Fable 5 and Mythos 5 for every customer worldwide

• The concern appears tied to a possible jailbreak for finding software flaws. Anthropic says the evidence was verbal, narrow, minor, and not unique to its models at all, based on its note

This is bigger than one AI launch. The U.S. is starting to treat frontier models like national security infrastructure, not simple software. at scale.

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SpaceX

Elon Musk Becomes Trillionaire After SpaceX Market Debut

Elon Musk just became the world’s first trillionaire after SpaceX’s record IPO. But this is bigger than wealth. It connects rockets, Starlink, xAI, AI compute, Mars, and Musk’s next giant company story.

Details:

• SpaceX raised $75B in the biggest IPO ever. Shares priced at $135, opened at $150, and closed at $160.95, pushing the company above $2T in market value

• Musk’s SpaceX stake pushed his net worth past $1T. AP says Forbes placed him near $1.1T, far ahead of other billionaires and larger than many national economies

• This is also an AI story. SpaceX merged with xAI, the maker of Grok, and investors are pricing in Starlink, rockets, AI compute, orbital data centers, and Mars infrastructure

The market is no longer viewing SpaceX as just a rocket company. It sees SpaceX as Musk’s complete platform for space, internet, AI, and computing.

Top AI & SaaS Tools

• Cleanlist AI (Life-time Deal): Turns messy contact lists into CRM-ready data by verifying emails and direct dials via 15+ providers, then syncing to tools like HubSpot, Salesforce

• OpenWhispr: Open-source AI speech-to-text app that runs fully locally and converts voice into formatted text [F-R-E-E]

• Prometheus: Experimental agent that writes Firecrawl code to collect web data you describe, and can be run or hosted by Firecrawl [F-R-E-E to Try]

• Higgsfield Games: Build and deploy multiplayer 2D or 3D games from a single prompt using Higgsfield MCP

• ZONOS2: Advanced, open-source real-time text-to-speech (TTS) model by Zyphra, featuring high expressiveness and strong voice cloning capabilities [F-R-E-E]

Where to Invest $100,000 Right Now, According to Experts

Investors face a dilemma. When the S&P 500 finished its worst quarter since 2022 last month, diversifiers like bonds and bitcoin fell too.

Even with the turnaround in mid-April, analysts at Goldman Sachs and Vanguard have projected low-single-digit annualized returns from 2024-2034.

Bloomberg asked where experts would personally invest $100,000 for their March monthly edition.

One answer that surfaced for a second time? Art.

It's what billionaires like Bezos and the Rockefellers have privately used to diversify for decades.

Why?

1. Appreciation. The ArtPrice100 Index outpaced the S&P 500 overall from 2000 to 2025

2. Low-correlation. The postwar contemporary segment has moved independently of traditional investments like stocks since ‘95.*

3. Resilience. A scarce, physical, and global asset class with decades of demonstrated demand.

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^{*According to Masterworks data. Investing involves risk. Past performance is not indicative of future returns. See important Reg A disclosures at masterworks.com/cd.}

AI Tutorial

How to Turn Reddit Threads Into Viral LinkedIn Posts

Most LinkedIn posts fail because they’re written from guesswork. This tutorial shows how to pull real audience language from Reddit and turn it into high-performing LinkedIn content using a simple 7-step workflow.

1. Pick right thread

   Go to a subreddit in your niche. Find a post with strong engagement. Look for lots of comments, not just upvotes.

2. Trigger JSON view

   Enter the thread. Tap the URL bar. Add /.json at the end. Press enter.

3. Copy raw audience voice

   You will see a wall of raw text. Copy everything on the page. This is the unfiltered language of your target audience.

4. Clean input

   Before you paste into an AI model:

   • Remove obvious repeats if you notice them.

   • Keep the title, top comments, and replies.

   • Do not rewrite anything.

5. Extract frustrations and hooks

   Paste the JSON into your AI model. Use this prompt:

   "I am pasting raw JSON data from a Reddit thread about [TOPIC]. Identify the top 3 frustrations. Include the exact phrases people used. Write 5 LinkedIn hooks based on those frustrations. Make them short and punchy like these:

   Example A: Stop doing [X]. It’s why you’re stuck.

   Example B: Most people think [Y]. That’s why they lose.

   Example C: If you struggle with [Z], read this.

   JSON Data:

   [PASTE DATA]"

6. Turn insights into posts

   Move the output to Claude. Use this prompt:

   "You are an expert LinkedIn ghostwriter. Write 5 LinkedIn posts using the frustrations below. Rules: Short sentences. Lots of white space. One actionable tip + one framework per post.

   End with: 'Repost if this helped.'

   Frustrations and exact phrases:

   [PASTE]"

7. Final polish before posting

   Pick the strongest post. Tighten the first 2 lines. Remove extra words. Post, then save best hooks for later.

Note: Focus on threads with strong comment depth, not just high upvotes. Long discussions usually mean stronger emotional signals.

Top AI & Tech News

• Meta’s Applied AI unit is facing intense employee backlash over forced transfers, soul-crushing work, and invasive monitoring, prompting leadership to promise fixes

• State attorneys general have opened a sweeping investigation into OpenAI, seeking documents on its ads, user data, minors, seniors, and internal policies

• Satya Nadella warns against “token-maxing,” or using the most powerful AI models for every task, saying it’s addictive and economically inefficient

• SpaceX reportedly rented out its Colossus 1 AI data center after facing latency and network issues while trying to run Grok AI in Memphis

AI Art Spotlight

Create Your Own Product Photo Like This Using the Prompt Below:

A premium brand identity mood board for [BRAND], editorial layout. Dark near-black background throughout. Top hero section features the [BRAND] logo large centered on deep dark background with brand-colored tagline beneath, subtle abstract pattern texture in background matching [BRAND] identity. Below in clean grid: color palette swatches with hex codes on dark card, typography showcase with display and body font samples on dark background, brand essence section with four icons and keywords (Energy, Quality, Passion, Vibes) with one-line descriptions. Center section shows hero product experience — [BRAND] flagship products arranged on dark moody surface. Lifestyle photography strip showing people connecting with [BRAND] in atmospheric low-light settings with branded caption labels. Full-width storefront or branded environment shot at night with glowing [BRAND] signage. Merchandise grid — hoodie, tote bag, cap, water bottle, socks all in [BRAND] colors. Bottom footer bar in [BRAND] primary color with three brand pillars and icons. Brand accent colors pop against near-black throughout. Professional, bold, dark editorial brand presentation. Portrait format 4:5

Model: ChatGPT Images 2.0

Prompt of the Day

Claude Fable 5 (Anthropic Mythos) System Prompt

The Claude Fable 5 system prompt is a 120,000-character instruction set that defines the model’s behavior, tone, safety rules, response formatting, handling of sensitive topics, and interactions with apps and memory. (Some people are even sarcastically suggesting that this leak contributed to the government’s decision to shut down Fable/Mythos.)

Featured AI Video

I analyzed 373 AI startups selected by YCombinator in 2026 (Build These with AI)

AI Course of the Day

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