Fast mode support for Claude Opus 4.6 is now available on AI Gateway. Fast mode is a premium high-speed option that delivers 2.5x faster output token speeds with the same model intelligence. This is an early, experimental feature. Fast mode's increased output token speeds enable new use cases, especially for human-in-the-loop workflows. Run large coding tasks without needing to context switch and get planning results without extended waits. To enable fast mode, pass speed: 'fast' in the anthropic provider options in AI SDK: import { streamText } from "ai" ; const { text } = await streamText ( { model : 'anthropic/claude-opus-4.6' , prompt : ` Analyze this codebase structure and create a step-by-step plan to add user authentication. ` , providerOptions : { anthropic : { speed : 'fast' , } , } , } ) ; You can use fast mode with Claude Code via AI Gateway by setting the CLAUDE_CODE_SKIP_FAST_MODE_ORG_CHECK variable in your shell configuration file or in ~/.claude/settings.json .…