Claude Code Cuts Costs with Server-Side Auto Mode Classifier

Claude Code v2.1.278 now defaults to server-side processing for Auto Mode classifier. Claude API, Enterprise, Bedrock, Vertex, Foundry, and gateway users are no

Claude Code · Release v2.1.278 · 2026-09-19

Claude Code v2.1.278 has changed the default setting to process Auto Mode classifier on the server side. Claude API, Enterprise, Bedrock, Vertex, Foundry, and gateway users are no longer charged for classifier overhead costs. Opt-out is available via environment variable, and warnings are displayed when billed fallback occurs. A new row has been added to the /status page to check whether the auto mode classifier is running on the server.

weltiq perspective: Reduced Claude API usage costs for AI-based trading tool development can improve cost efficiency for weltiq users implementing automated strategies.

Release Notes Excerpt

What's changed Changed auto mode for Claude API and Enterprise users, and on Bedrock, Vertex, Foundry and gateways, to default to the server-side classifier, which does not charge for classifier overhead ( CLAUDE_CODE_AUTO_MODE_SERVER=0 opts out on Bedrock, Vertex, Foundry and gateways); warns on billed fallback. See https://code.claude.com/docs/en/auto-mode-classifier-billing Added an Auto mode server row to /status showing whether this session's auto mode classifier runs on the server

Source: https://github.com/anthropics/claude-code/releases/tag/v2.1.278