Claude Code 2.1.322 brings fast mode to Google Cloud Vertex AI

Anthropic's November 10, 2026 release extends Claude Code's fast mode to Vertex AI traffic in three regions, with automatic fallback if the faster routing is refused.

Anthropic released Claude Code version 2.1.322 on November 10, 2026, according to the Claude Code changelog. The update makes one change: it extends the tool's low-latency fast mode to traffic routed through Google Cloud Vertex AI, closing a gap for enterprises that use Vertex AI for billing or compliance reasons but previously had to give up the speed boost available to direct API and Claude subscription users.

What changed in version 2.1.322

Claude Code version 2.1.322 was released on November 10, 2026.
Fast mode is now available for Vertex AI traffic in the global, us, and eu regions.
If Vertex AI refuses a fast-mode request, Claude Code automatically falls back to standard speed.
The release follows version 2.1.321 from November 9, 2026, which made Claude Fable 5.2 the default model.
Per Anthropic's fast-mode documentation, fast mode makes supported models up to 2.5x faster at a higher per-token price, with no change in model quality or capability.

Why it matters for builders

Enterprises that buy Claude through Google Cloud Vertex AI for compliance or billing reasons no longer have to trade away fast mode's latency improvement. The automatic fallback also means a Vertex-side refusal degrades gracefully instead of breaking an agent run mid-session.

Pricing and availability

Anthropic's fast-mode pricing is flat across the full 1M-token context window: Claude Fable 5.2 costs $16 per million input tokens and $80 per million output tokens, Claude Opus 5.5 costs $8 and $40, and Claude Opus 5 and Opus 4.8 both cost $10 and $50. Before this release, fast mode was unavailable on Vertex AI, alongside Amazon Bedrock, Google Cloud's Agent Platform, Microsoft Foundry, and Claude Platform on AWS.

Sources

Claude Code changelog - v2.1.322 (Anthropic / Claude Code, November 10, 2026, official)

Written with AI assistance, strictly from the sources listed above. Before it went live, automated checks verified its dates, sources and every language edition.