Fast Mode for Opus 4.6

Accelerated Development Workflow

On February 7, 2026, Anthropic made Fast Mode available for Claude Opus 4.6 in Claude Code. This high-speed configuration delivers the same Opus-level intelligence with significantly faster output token speeds—approximately 2.5x faster than standard mode.

Fast Mode represents an important option for developers who need rapid iteration cycles. It runs on the same Opus 4.6 model with identical model weights, intelligence level, and response quality—the only difference is the dramatically increased output speed.

How to Use Fast Mode

Activating Fast Mode in Claude Code is straightforward: developers simply type /fast and hit Tab to toggle it. Once enabled, a lightning bolt icon (↯) appears to indicate Fast Mode is active. The setting persists across sessions, eliminating the need to re-enable it for each new conversation.

This seamless integration makes it easy to switch between standard and fast modes depending on the task at hand—using Fast Mode when speed is critical and standard mode when cost efficiency is the priority.

Pricing and Availability

Fast Mode's output pricing is $150 per million tokens, compared to $25 per million tokens for standard Opus 4.6—a 6x price multiplier. However, through February 16, 2026, Anthropic offered Fast Mode at 50% off, reducing the multiplier to 3x standard pricing during the promotional period.

Importantly, Fast Mode fees are charged separately from subscription quotas through an independent "extra consumption" channel. This means developers can use Fast Mode without depleting their regular subscription allocation, though they'll incur additional charges starting from the first token.

Use Cases

Fast Mode is particularly valuable for scenarios requiring rapid feedback loops: debugging complex issues, iterating on UI components, generating boilerplate code, and exploring multiple solution approaches. The 2.5x speed improvement can dramatically reduce development friction when working through multiple rounds of refinement.

For production workflows or tasks where response time is less critical, standard mode remains the cost-effective choice. The ability to toggle between modes on-the-fly gives developers control over the speed-cost tradeoff.