xAI Was 'Not Built Right' — Musk Pledges Rebuild as Cofounders Exit

Elon Musk posted on X last week that “xAI was not built right first time around, so is being rebuilt from the foundations up.” The statement came as the cofounder exodus at the company accelerated — of the 12 people who cofounded xAI with Musk in 2023, only two now remain.

Who Left and Why

The departure list is significant. Recent exits include:

• Tony Wu and Igor Babuschkin — early technical leads
• Kyle Kosic and Christian Szegedy — left in the weeks prior
• Jimmy Ba — posted on X that he was “grateful to have helped cofound at the start”
• Zihang Dai and Guodong Zhang — departed this week, reportedly after Musk expressed frustration that xAI’s coding tools weren’t competing effectively with Claude Code and Codex

The last point matters: the trigger for the most recent departures is explicit. Musk complained internally that xAI’s AI coding products weren’t keeping pace with Anthropic and OpenAI. Two engineers from Cursor have since been poached to help address that gap.

The Rebuild Context

This is happening less than six weeks after Musk merged SpaceX and xAI in a deal valued at $1.25 trillion — a structural move that combined xAI’s AI capabilities with SpaceX’s engineering talent and infrastructure. The xAI rebuild appears to be the internal organizational response to that merger: restructuring the team around the combined entity’s priorities.

Musk and Baris Akis (one of the two remaining cofounders) are reportedly reviewing interview histories to recall promising candidates who weren’t hired the first time.

What “Not Built Right” Actually Means

Reading between the lines: the original xAI was assembled quickly to compete with OpenAI and Anthropic on model research. What Musk seems to want now is different — a product-focused organization that can ship developer tools competitive with Claude Code and Codex, not just frontier model research.

The Cursor hiring signals the direction: xAI wants engineers who know how to build AI-assisted developer products, not just how to train large language models.

Grok’s Current Position

Grok remains xAI’s primary public-facing product. The model has improved significantly through 2025 with Grok-3 releasing earlier this year. But in developer tooling — the segment where Musk is now focusing attention — xAI doesn’t have a product with meaningful market share. That’s the gap the rebuild is meant to close.

Whether a leadership reset can close that gap against entrenched competitors like Cursor, Claude Code, and Codex is an open question. The talent market for experienced AI product engineers is extremely competitive, and many of the best have already joined the incumbents.

Sources: Bloomberg, CNBC, Fortune, TechCrunch — March 13–16, 2026