Elon Musk Announces Grok Build Open Source, Grok 4.5 EU Launch; Jack Releases Open-Weight Inkling Model; Perplexity Unveils SPACE Platform

Key Takeaways

1. Elon Musk announces Grok Build open source, Grok 4.5 EU launch, and SpaceXAI lawsuit against deepfake creator.
2. Jack releases first model Inkling, open-weight and fine-tunable on Tinker.
3. Perplexity launches SPACE platform with 5x tail latency reduction and Agent API for low-cost investment memos.
4. OpenAI introduces GPT-Red for automated red-teaming to find prompt injection vulnerabilities.
5. Vercel Sandbox achieves 100% MoM DAU growth with 3.5M+ daily sandboxes.
6. Nikita Bier rolls out Mentions Boost ads and stricter creator revenue sharing to combat spam.

1. AI Models and Infrastructure

1. Elon Musk announced that Grok Build has been open-sourced, with default data retention disabled and all previously stored encoding data deleted, giving users full data control. Additionally, Grok 4.5 has launched in the EU, with usage limits reset. — via 1 2 3
2. jack released Inkling, his first model trained from scratch, with open weights and fine-tuning capability on Tinker. — via 1
3. Naval highlighted a new ARC-AGI-3 benchmark result: Opus 4.8 + Fable 5 achieved 99% RHAE, and GPT-5.6 Sol achieved 95.35% using a harness from Impossible Research that makes LLMs think like physicists. — via 1 2
4. Aravind Srinivas detailed Perplexity's SPACE platform, a lifecycle management system for sandboxes that fully handles Computer production traffic, reducing tail latency by 5x. It uses disk snapshots and full checkpoints based on Btrfs copy-on-write, cutting median creation latency from 185ms to 60ms (P90 from 447ms to 89ms). — via 1 2
5. Sam Altman introduced GPT-Red, an internal automated red-teaming tool for scale finding prompt injection vulnerabilities in models, aiming to build stronger defenses. — via 1

2. Platform and Product Updates

1. Nikita Bier launched Mentions Boost, an ad product that boosts post reach after organic brand mentions, transparent to users and available for Premium Business accounts. He also announced updates to the creator revenue-sharing program: accounts with >3 engagement-bait posts will be removed (nearly 4,000 already), and a new model triples detection efficiency for duplicate content; watermarks or edits still attribute earnings to original authors, detecting 1.5M stolen posts. These changes redirect over $1M back to original creators. — via 1 2
2. Vercel (via Guillermo Rauch) announced that Vercel Sandbox achieved 100% MoM DAU growth, creating over 3.5 million sandboxes daily, with an optimal Active CPU pricing model, adopted by Notion, Airtable, Meta, Zapier, and others. — via 1
3. Perplexity (via Aravind Srinivas) added a "Created by you" filter on Computer Artifacts pages, allowing filtering by report, document, table, etc., now live for all web users. — via 1. The Perplexity Agent API combined with LangChain can generate a VC investment memo with citations in 90 seconds at a cost of just $0.4. — via 2
4. Elon Musk confirmed Starship Flight 13 launched today, stating it will "make history again." — via 1

3. AI Safety and Policy

1. SpaceXAI (via Elon Musk) is suing a user who used Grok to create illegal deepfakes, with the user already facing eight child sexual abuse felony charges. SpaceXAI also disclosed data: in 2026, it suspended 52,222 accounts, submitted 73,604 reports to NCMEC, and facilitated at least 244 arrests. — via 1
2. Andrew Wilkinson criticized X for failing to address AI bot replies, citing three types of abusive accounts (AI-generated reply bots, short-seller trolls, impersonation scams) all with blue checks, calling the platform a "cesspool." — via 1