Claude Fable 5.1 (AWS Bedrock)

AWS has made Claude Fable 5.1 available on its cloud platform through Amazon Bedrock and the Claude Platform on AWS, adding another Anthropic model to the provider's hosted lineup. According to IT Brief NZ's coverage, Anthropic has classified Claude Fable 5.1 as a Covered Model, which brings additional rules on data re The deployment uses a new 'aws_review' data retention mode, while Amazon Bedrock does not share customer data with the model provider under the legacy 'provider_data_share' mode. Eligible customers can also access Claude Fable 5.1 through Enterprise Frontier Safeguards, a configuration developed with Anthropic that kee

AWS's official weekly roundup for September 7, 2026 explicitly names Claude Fable 5.1 on AWS as one of its headline items, alongside the Amazon Linux 2027 public preview and the AWS Certified AI Business Strategist credential. The roundup confirms the model has been onboarded to AWS and surfaces it as part of a broader The article frames Claude Fable 5.1 on AWS as part of AWS's continuing effort to add new services and refresh existing ones to meet growing demand for cloud systems supporting AI workloads. As a first-party AWS News Blog entry, it serves as the official attribution source for the model's availability on AWS infrastruct

Claude Fable 5.1 carries the Claude API ID claude-fable-5-1, was released on September 1, 2026, and ships at the same $10 per million input and $50 per million output list price as Fable 5, with cache reads cut by 75% from $1.00 to $0.25 per million tokens. Context window is 1M tokens with 128k maximum output, and the The article reports hands-on reruns through the raw Messages API on claude-fable-5-1, claude-fable-5, and claude-opus-5, graded with real linters and measured on cost per task, performed on September 3, 2026 against Anthropic's September 2026 documentation. It notes that cache reads now cost a quarter of the Fable 5 ra

Anthropic released Claude Fable 5.1 on September 1, 2026, alongside its restricted twin Claude Mythos 5.1, which sits behind vetted programs like the Cyber Verification Program, the Life Sciences Verification Program, and Project Glasswing. The two share the same weights but ship under different safeguard regimes, with The headline economic move is a 75% cut to cache reads, from $1.00 to $0.25 per million tokens, with list prices otherwise unchanged at $10 input and $50 output per million tokens; Anthropic estimates typical workloads become about 25% cheaper and highly agentic workloads up to 45% cheaper than Fable 5. Safeguard preci

Claude Fable 5.1 from Anthropic is now available on Amazon Bedrock and Claude Platform on AWS, per an About Amazon newsroom article originally published June 9, 2026 and updated September 1, 2026. According to Anthropic, Fable 5.1 achieves clear gains over Fable 5 on benchmarks and is positioned to power agents across The article lists five capability areas where Fable 5.1 improves: stronger reasoning on the hardest math, science, and multi-step benchmarks with fewer confident wrong answers; agentic coding that handles larger multi-hour engineering work and reports blockers honestly; autonomous operation built for multi-hour jobs sp

On September 1, 2026, Anthropic's Claude Fable 5.1 became available on Amazon Bedrock and the Claude Platform on AWS, following Anthropic's release announcement and AWS's own What's New and Machine Learning Blog posts. Verification was conducted on September 2, 2026, in us-east-1 using AWS CLI 2.36.36, exercising both Converse calls are made by specifying a Global inference profile as the model ID, with Geo inference profiles using us.anthropic.claude-fable-5-1 and Global using global.anthropic.claude-fable-5-1; the In-Region endpoint URL is N/A for programmatic access. Thinking content is returned in separate reasoningContent block

Anthropic released Claude Fable 5.1 and Claude Mythos 5.1 in September 2026 as the same underlying weights at different safeguard levels, with Fable 5.1 generally available and Mythos 5.1 reserved for trusted organizations in cybersecurity and life-sciences work. The API model ID is claude-fable-5-1, and the release is Benchmarks show Terminal-Bench-Science 0.1 at 52.6% versus 24.7% on Fable 5, AutomationBench at 31.4% versus 17.1%, Terminal-Bench 4.0 at 55.8% versus 42.0%, OSWorld 2.0 (partial) at 77.9% versus 72.9%, CursorBench 3.2.0 at 73.4% versus 70.5%, GDPval-AA v2 ELO at 1853 versus 1723, and Humanity's Last Exam at 60.9% with

An emergent.sh article confirms that Anthropic launched Claude Fable 5.1 on September 1, 2026, going straight to general availability rather than a phased enterprise preview. Developers can call claude-fable-5-1 on the Claude API and through Amazon Bedrock, Google Cloud, and Microsoft Foundry the same day. Anthropic fr Pricing held at Fable 5's headline rates of $10 per million input tokens and $50 per million output tokens, but the cache-read rate dropped 75% to $0.25 per million tokens, down from $1. Fable 5.1 also defaults to different effort levels depending on surface: High in Claude Code, and Medium in Claude Cowork and on Clau