AWS launches Claude Fable 5, first generally available Mythos-class AI model

AWS announced the general availability of Claude Fable 5 on June 9, 2026, making it the first Mythos-class AI model accessible to all customers. The model, developed by Anthropic, is available through Amazon Bedrock and the Claude Platform on AWS.

Claude Fable 5 delivers state-of-the-art results on nearly all tested benchmarks, according to AWS. It can run for extended periods on complex knowledge work and coding tasks without human intervention, representing a fundamental shift in the types of problems customers can solve with AI.

Safety and access tiers

Claude Fable 5 includes strong safety classifiers designed to make Mythos-level capabilities safe for broader use. For customers who need the raw model without those safeguards, Anthropic offers Claude Mythos 5, which is available to a small group of customers who previously had access to Claude Mythos Preview.

• Claude Fable 5 is built for professional tasks in finance, legal, marketing, sales, data, and engineering.
• The model proactively self-updates skills based on learnings, develops its own evaluation harnesses, and verifies its work before delivery.
• Amazon Bedrock keeps customer data within AWS infrastructure and provides access through a unified service with AWS-managed features like Guardrails, Knowledge Bases, and regional data residency.
• The Claude Platform on AWS, operated by Anthropic, gives direct access to Anthropic's native Claude platform experience with unified AWS billing and authentication.

Broader Anthropic ecosystem updates

Anthropic has also been active with other product updates. On May 28, 2026, the company shipped Claude Opus 4.8, which introduced dynamic workflows in Claude Code. In a test, Claude Code ran five agents simultaneously, demonstrating the platform's ability to handle complex, multi-agent tasks.

Additionally, Anthropic announced a limited-time promotion that doubles users' five-hour usage limits in Claude Cowork at no charge. The promotion is designed to encourage more users to explore the collaborative coding environment.

These moves signal Anthropic's aggressive push to expand access to its most advanced AI models while maintaining safety controls. The combination of a generally available Mythos-class model, enhanced agentic workflows, and increased usage limits positions Anthropic to compete directly with other frontier model providers in the enterprise market.