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Top stories today:
- Elonβs 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
All values as of 6 AM ET / 3 AM PT, other than S&P500 and NASDAQ close (4 PM ET / 1 PM PT).
All times are ET.
Listen to our AI-generated podcast summarizing todayβs newsletter (beware of hallucinations):
1. Elonβs xAI launches Grok 4, Grok 4 Heavy AI models to counter OpenAI, Anthropic, Google
Grok 4 has topped the Artificial Analysis Intelligence Index, surpassing OpenAIβs o3-pro and Googleβs Gemini 2.5 Pro:
Hit an all-time high score of 88% in GPQA Diamond, surpassing Gemini 2.5 Proβs previous record of 84%.
All-time high score in Humanityβs Last Exam of 25%, beating Gemini 2.5 Proβs 21% record.
Trained on xAIβs Colossus supercomputer.
Grok 4 Code specialized version for coding.
Grok 4βs 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 xAIβs βmulti-agent versionβ, offering even higher performance than Grok 4
SuperGrok Heavy has also been launched as xAIβs most expensive subscription plan at $300/month to offer an early preview to Grok 4 Heavy.
The release follows Grokβs antisemitism row and Yaccarinoβs departure.
Relatedly, Elon Musk broke his silence on Grokβs Nazi bender and said it was βwas too compliant to user promptsβ¦ That is being addressed.β
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3. OpenAI said to release AI-powered web browser to rival Google Chrome
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