Update: This article was originally published on June 9, 2026. It has been updated to reflect the availability of Claude Fable 5.1.

Key takeaways

  • Claude Fable 5.1 achieves clear gains over Fable 5 on benchmarks.
  • Powers agents across the software lifecycle including codebase-wide features, code review, and performance work.
  • Scientific research is supported across the full cycle, with formal verification to check its own reasoning.
Claude Fable 5.1 is now available on Amazon Bedrock and Claude Platform on AWS. Fable 5.1 is built to run demanding work end to end across software, documents, and research. It outperforms Fable 5 on Anthropic’s most difficult evaluations. Anthropic has designated it a Covered Model—a category that carries additional data retention, safety review, and access policies.
Anthropic also announced Enterprise Frontier Safeguards, a solution that will give customers the option to safely deploy Anthropic's most capable models while keeping their data in cloud infrastructure they control.
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What’s new in Claude Fable 5.1

Claude Fable 5.1 shows improvement in the following areas:
  • Stronger reasoning—improved performance on the hardest math, science, and multi-step benchmarks.
  • Agentic coding—handles larger engineering work across multi-hour sessions.
  • Autonomous operation—runs multi-hour, multi-app tasks, planning, choosing tools, and recovering from failures.
  • End-to-end knowledge work—takes an analysis from question to finished deliverable for finance, accounting, and healthcare teams.
  • Scientific research—runs full research campaigns from literature and hypotheses to experiments and formal verification.

How to access Claude Fable 5.1 on AWS

Access Claude Fable 5.1 through Amazon Bedrock or Claude Platform on AWS. For a full walkthrough, read more about Claude Fable 5.1 on AWS.

Dive deeper

Visit Anthropic’s Claude in Amazon Bedrock product page for more detailed information on Claude Fable 5.1, Claude Opus 5, Claude Sonnet 5, Claude Fable 5, Claude Opus 4.8, Claude Opus 4.7, Claude Sonnet 4.6, Claude Opus 4.6, Claude Haiku 4.5, Claude Sonnet 4.5, Claude Opus 4.5, Claude Opus 4.1, and Claude Sonnet 4.
September 1, 2026: This article has been updated to reflect the availability of Claude Fable 5.1.
July 24, 2026: This article has been updated to reflect the availability of Claude Opus 5.
June 30, 2026: This article has been updated to reflect the availability of Claude Sonnet 5.
June 9, 2026: This article has been updated to reflect the availability of Claude Fable 5.
May 28, 2026: This article has been updated to reflect the availability of Claude Opus 4.8.
February 17, 2026: This article has been updated to reflect the availability of Claude Sonnet 4.6.
February 5, 2026: This article has been updated to reflect the availability of Claude Opus 4.6.
November 24, 2025: This article has been updated to reflect the availability of Claude Opus 4.5.
October 15, 2025: This article has been updated to reflect the availability of Claude Haiku 4.5.
September 29, 2025: This article has been updated to reflect the availability of Claude Sonnet 4.5.
August 5, 2025: This article has been updated to reflect the availability of Claude Opus 4.1.

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