xAI's upsized $20bn Series E values it near $230bn
Nvidia, Cisco, QIA and MGX back the Colossus compute build; xAI then leases Colossus 1 output to Anthropic
Summary
Xai closed an upsized Series E in January 2026, raising $20bn against a $15bn target at a reported ~$230bn valuation. Backers include Valor, Stepstone, Fidelity, the Qatar Investment Authority, MGX and Baron, with Nvidia and Cisco as strategic investors funding the Colossus GPU clusters. The capital underwrites what xAI calls the largest GPU clusters in the world for Grok. In a notable twist, xAI then agreed to lease the entire output of its Colossus 1 data centre to rival Anthropic at ~$1.25bn/month through May 2029, monetising spare capacity even as it races on model quality. The raise keeps xAI in the capital arms race with OpenAI and Anthropic.
By the numbers
- $20bn, Series E (upsized from $15bn target).
- ~$230bn, reported valuation.
- Jan 2026, round close.
- ~$1.25bn/month, Colossus 1 lease to Anthropic through May 2029.
- Nvidia, Cisco, strategic investors.
Why it matters
xAI's valuation rests on raw compute scale and Musk's distribution via X and Tesla. Leasing Colossus capacity to Anthropic shows even rivals are interdependent through hardware, and that GPU clusters are an asset class in their own right, rented when not training.
What to watch
- Grok model releases against GPT-5.5, Gemini 3.5 and Opus 4.8.
- xAI/SpaceX financial entanglement ahead of SpaceX's listing.
- Whether xAI raises again in 2026 to keep pace on compute.