Is Claude Fable 5.1 out yet?
Yes.
About Claude Fable 5.1
Claude Fable 5.1 is available on Anthropic’s API and AWS Bedrock. Anthropic model documentation: https://docs.anthropic.com/en/docs/models/fable-5-1. AWS availability announcement: https://aws.amazon.com/blogs/machine-learning/introducing-claude-fable-5-1-on-aws/
How we confirmed it
Released via the API
September 1, 2026 at 12:00 PM UTC
An administrator marked this model available (silently).
Open detection source →Release timeline
- 2026-06-23 Official announcement or source
- 2026-10-12T20:59:51.753Z First official availability observed
- 2026-10-12T20:59:51.753Z Availability confirmed after the second check
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Benchmarks
Coding#7
Claude Fable 5.1 · via BenchLM.ai · captured Nov 13, 2026 · source
73.98
Agentic#4
Claude Fable 5.1 · via BenchLM.ai · captured Nov 13, 2026 · source
79.21
Reasoning#8
Claude Fable 5.1 · via BenchLM.ai · captured Nov 13, 2026 · source
76.36
Knowledge#5
Claude Fable 5.1 · via BenchLM.ai · captured Nov 13, 2026 · source
84.08
Humanity's Last Exam
Fable 5.1 (xhigh) · via Epoch AI · captured Nov 13, 2026 · source
46.5
GDP.pdf
Claude Fable 5.1 (Adaptive/High) · via Epoch AI · captured Nov 13, 2026 · source
29.6
LM Arena#5
Claude Fable 5.1 (Max) · via LM Arena · 16,343 votes · captured Oct 26, 2026 · source
1503.1905093383516
MultimodalGrounded#5
Claude Fable 5.1 · via BenchLM.ai · captured Nov 13, 2026 · source
80.54
Sourced metrics mirrored with attribution - not community sentiment.
Data from BenchLM.ai.
Data from Epoch AI, “AI Benchmarking Hub” (CC BY 4.0).
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OutYet reporting
- Claude Fable 5.1 adds agent controls, but migration and Bedrock constraints matter
Anthropic's Fable 5.1 documentation highlights cache economics and agent features, but migration constraints, Bedrock API limits, retention settings, and refusal handling deserve equal attention.
- Claude Fable 5.1 on AWS makes data handling part of the deployment decision
AWS documentation positions Claude Fable 5.1 as a long-horizon coding and knowledge-work model, but its Bedrock path carries retention and review requirements that technical teams need to evaluate alongside capability claims.
- Claude Fable 5.1 turns data retention into an engineering decision
Anthropic's Fable 5.1 materials pair capability and pricing claims with deployment conditions that matter to AWS teams.
- Claude Fable 5.1 puts migration and data-retention choices in the foreground
Anthropic and AWS documentation put Claude Fable 5.1's migration behavior, cache economics, and safety-monitoring boundaries ahead of broad capability claims for technical buyers.
- AWS documents the Bedrock migration path for Claude Fable 5.1
AWS's Fable 5.1 materials matter as an integration contract: they specify endpoints, model identifiers, retention controls, and response handling that teams should test before moving long-running agent workloads.
- Claude Fable 5.1 on Bedrock puts data handling on the deployment checklist
AWS and Anthropic documents frame Fable 5.1 as a long-running-work successor, but its Bedrock path adds retention modes, review conditions and inference-profile choices.
- Claude Fable 5.1 makes cache economics and safety routing part of the deployment decision
Anthropic's Fable 5.1 update changes more than the model name: lower cache-read pricing, safety fallbacks, and cloud-specific retention controls make workload design and governance central to evaluating it.
Compare Claude Fable 5.1 with another model →
Also waiting on: Gemini 3.5 Pro, GLM-6, Grok 5, Amazon Nova 2 Pro
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