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Top stories today:
- Elon’s xAI launches Grok 4, Grok 4 Heavy AI models
- OpenAI said to release AI-powered web browser to rival Google Chrome
- Apple said to ready 1st upgrade for struggling Vision Pro headset
- X CEO Linda Yaccarino quits after stabilizing ads
- Perplexity launches AI-powered web browser Comet
0. Data and calendar
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All times are ET.
Listen to our AI-generated podcast summarizing today’s newsletter (beware of hallucinations):
1. Elon’s xAI launches Grok 4, Grok 4 Heavy AI models to counter OpenAI, Anthropic, Google
Grok 4 has topped the Artificial Analysis Intelligence Index, surpassing OpenAI’s o3-pro and Google’s Gemini 2.5 Pro:
Hit an all-time high score of 88% in GPQA Diamond, surpassing Gemini 2.5 Pro’s previous record of 84%.
All-time high score in Humanity’s Last Exam of 25%, beating Gemini 2.5 Pro’s 21% record.
Trained on xAI’s Colossus supercomputer.
Grok 4 Code specialized version for coding.
Grok 4’s pricing is equivalent to Grok 3 at $3/$15 per 1M input/output tokens, identical to Claude 4 Sonnet
More expensive than Gemini 2.5 Pro ($1.25/$10 for <200K input tokens) and o3 ($2/$8).
Grok 4 has recorded slightly higher output token usage compared to peer models
Grok 4 Heavy is xAI’s “multi-agent version”, offering even higher performance than Grok 4
SuperGrok Heavy has also been launched as xAI’s most expensive subscription plan at $300/month to offer an early preview to Grok 4 Heavy.
The release follows Grok’s antisemitism row and Yaccarino’s departure.
Relatedly, Elon Musk broke his silence on Grok’s Nazi bender and said it was “was too compliant to user prompts… That is being addressed.”
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3. OpenAI said to release AI-powered web browser to rival Google Chrome
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