Claude Fable 5.1 (Global)

AWS published a Machine Learning blog post titled "Introducing Claude Fable 5.1 on AWS," dated September 1, 2026, announcing the model's availability on Amazon Bedrock. This is the primary vendor source for Bedrock-specific availability and integration details relevant to the global.anthropic.claude-fable-5-1 model. The excerpt confirms the post exists on aws.amazon.com/blogs/machine-learning and is dated 2026-09-01, though the scraped content was truncated by a cookie preferences banner. Combined with the Amazon newsroom confirmation, it establishes that Anthropic's Claude Fable 5.1 is officially supported on Amazon Bedrock as of

The aboutamazon.com corporate news article explicitly names Claude Fable 5.1 and confirms it is now available on Amazon Bedrock and Claude Platform on AWS, framing it as Anthropic's new frontier model for coding, scientific research, and enterprise workflows with clear gains over Fable 5 on benchmarks. The article enum Anthropic's Enterprise Frontier Safeguards are also described as an option for customers to safely deploy capable models while keeping data in their own cloud infrastructure. The article was originally published June 9, 2026 and updated September 1, 2026 to reflect Fable 5.1 availability, and its URL slug still referen

The explainx.ai breakdown aggregates concrete numbers attributed to Anthropic's launch and platform docs: Claude Fable 5.1 (API ID claude-fable-5-1) hit 55.8% on Terminal-Bench 4.0 vs Fable 5's 42.0%, and 52.6% on Terminal-Bench-Science 0.1 vs Fable 5's 24.7% — more than double — with Cursor reporting 73.4% at max effo The article also notes Enterprise Frontier Safeguards rolling out in fall 2026 and a writing-style fix intended to reduce the verbose, jargon-heavy output that affected Fable 5, while separating Fable 5.1 from the sibling Mythos 5.1 variant (same weights, different safeguards, restricted access). As a third-party sourc

A third-party technical review at kingy.ai provides concrete API details for Claude Fable 5.1: API model ID claude-fable-5-1, 1M context window, 128K output, $10 per million input tokens and $50 per million output tokens. Cache reads are priced at $0.25 per million tokens, a 75% reduction from Fable 5's $1 per million, The review notes Anthropic's own model guide recommends starting with Opus 5 for most workloads and escalating to Fable 5.1 when Opus fails an evaluation that matters. A paid sealed comparison through Vercel AI Gateway found no quality advantage for Fable 5.1 over Opus 5 or Sonnet 5 on a 30-case pilot workload, with So

Anthropic's official Release Notes confirm that Claude Fable 5.1 (alongside the restricted-access Claude Mythos 5.1 variant) launched on September 1, 2026, with Anthropic describing both models as its most advanced offerings for coding and knowledge work, and pointing to the launch blog post for further detail. The pag Beyond the dated launch line, the scraped excerpt does not surface deeper feature details, so this candidate serves as authoritative timestamp confirmation of the Fable 5.1 launch rather than as a source for benchmark, pricing, or capability specifics. It anchors the model-focused narrative that Fable 5.1 is the named