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Version 1.1.0
Anthropic: Claude Opus 4.6 (Fast) · Discover · Kaino
Discover/MODELS/Anthropic: Claude Opus 4.6 (Fast)
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MODELS

Anthropic: Claude Opus 4.6 (Fast)

by Anthropic

modellead-sourceopenrouter-modelsanthropicclaudeopus-4.6fast-moderesearch-previewsource:anthropic.comclaude-apiopenrouter
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Overview

Fast mode for Claude Opus 4.6 is a faster inference configuration enabled with `speed: "fast"` for supported Opus models.

Details

Anthropic documents Fast mode as a research-preview inference configuration for supported Opus models, including Claude Opus 4.6 with model ID `claude-opus-4-6`, enabled through the Claude API using `speed: "fast"`. OpenRouter lists “Anthropic: Claude Opus 4.6 (Fast)” as a fast-mode variant of Opus 4.6 with identical capabilities, higher output speed, and premium 6x pricing. Anthropic’s Claude Opus 4.6 launch page says the base model is available on claude.ai, the Claude API, and major cloud platforms, and the official system card describes Claude Opus 4.6 as a large language model from Anthropic with documented capabilities, evaluations, safety testing, and deployment considerations.

When to Use

Use when you want Claude Opus 4.6 with Anthropic’s documented faster Fast mode inference configuration. Use when higher output speed is worth the separate Fast mode pricing listed by Anthropic. Use when integrating through the Claude API and you can set `speed: "fast"` for model ID `claude-opus-4-6`.

Getting Started

  1. Read Anthropic’s Fast mode documentation at https://platform.claude.com/docs/en/build-with-claude/fast-mode.
  2. Use model ID `claude-opus-4-6` and enable Fast mode with `speed: "fast"` as documented by Anthropic.
  3. Review Anthropic’s pricing page because Fast mode pricing is listed separately from base Claude Opus 4.6 pricing.
  4. If using OpenRouter, review the OpenRouter listing for Anthropic: Claude Opus 4.6 (Fast).

Key Features

  • •Fast-mode inference configuration for supported Opus models
  • •Documented support for Claude Opus 4.6 via model ID `claude-opus-4-6`
  • •Enabled in the Claude API with `speed: "fast"`
  • •OpenRouter describes the variant as having identical capabilities to Opus 4.6 with higher output speed

Capabilities

  • •faster-inference
  • •claude-api
  • •opus-model
  • •openrouter-available

Last updated Jun 1, 2026