Anthropic Outage Shows Why Single-Vendor Fallback Isn't Enough

Anthropic resolved a near-three-hour incident on September 3, 2026, causing elevated errors across multiple Claude models at once. Unlike a 14-minute single-model outage earlier that month, no backup within Anthropic's own stack existed. Teams had to reroute to competitors or retry. The event confirms that routing across separate providers, not just separate models, is the only resilient pattern.