Anthropic Secures Full Capacity of SpaceX/xAI Colossus 1 Data Center Amid Environmental and Supply‑Chain Concerns

Anthropic announced it will use all of the capacity of SpaceX/xAI's Colossus 1 data center for Claude training, a move that raises environmental and supply‑chain concerns. The Colossus 1 facility was built on gas turbines that initially operated without Clean Air Act permits, a fact that has been linked to increased hospital admissions for low air quality. Elon Musk confirmed the lease in a tweet, noting that SpaceXAI has already shifted its own training to the larger Colossus 2 center. The partnership also signals that Anthropic will rely on this compute while xAI keeps its own capacity for Grok models. Meanwhile, xAI issued a deprecation notice for Grok 4.1 Fast and several other models effective May 15 2026, giving clients only two weeks to migrate.

The deprecation list includes grok‑4‑1‑fast‑reasoning, grok‑4‑1‑fast‑non‑reasoning, grok‑4‑fast‑reasoning, grok‑4‑fast‑non‑reasoning, grok‑4‑0709, grok‑code‑fast‑1, grok‑3 and grok‑imagine‑image‑pro. Musk added that compute will be reclaimed if an AI harms humanity, adding a new layer of supply‑chain risk for Anthropic. The deal highlights the political pressure on AI data centers, with critics like Andy Masley warning against using the Colossus 1 site. For Allsikt, the shift may affect clients who rely on Anthropic or xAI models, and the rapid deprecation of Grok 4.1 Fast requires immediate migration planning.