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Elon’s xAI launches Grok 4, Grok 4 Heavy AI models to counter OpenAI, Anthropic, Google

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Top stories today:

  1. Elon’s xAI launches Grok 4, Grok 4 Heavy AI models
  2. OpenAI said to release AI-powered web browser to rival Google Chrome
  3. Apple said to ready 1st upgrade for struggling Vision Pro headset
  4. X CEO Linda Yaccarino quits after stabilizing ads
  5. Perplexity launches AI-powered web browser Comet

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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

Here’s how:

*Disclaimer: We have equity in Athyna.

3. OpenAI said to release AI-powered web browser to rival Google Chrome

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