Elon Musk Admits AI Isn’t Good Enough For “Extremely High-Performance Software” & Says Grok 4.9 Should Match Fable Class Models

Elon Musk said AI isn't good enough for "extremely high-performance software" and that Grok's C/C++ training stack is written by humans. He said Grok 4.8 with 2.5 trillion parameters will finish training this week and move to RL, and Grok 4.9 will likely match Astra and Fable class models.

• Musk: Grok's C/C++ training stack is human-written; AI not yet up to high-performance software
• Grok 4.8 with 2.5 trillion parameters to finish training and enter RL this week
• Grok 4.7 should match Opus 5.0, not 5.1, per Musk
• Grok 4.9 likely to match Astra and Fable class models