Claude Fable 5.1 — reviews, specs & pricing
Anthropic's September 2026 frontier refresh; 52.6% on Terminal-Bench Science, with a 75% cache-read price cut.
Summary
Claude Fable 5.1 represents Anthropic's September 2026 frontier refresh, delivering highly specialized performance across chat and coding modalities. It sets a new technical benchmark with a 52.6% score on Terminal-Bench Science while dramatically lowering operational costs. This model is engineered to excel at complex computational reasoning, developer workflows, and system-level interactions.
Sample use case
A software engineering team can deploy Claude Fable 5.1 to manage and debug their automated continuous integration pipelines. By leveraging the model's exceptional terminal reasoning capabilities alongside the 75% cache-read discount, developers can feed massive codebases and persistent system logs into the context window for rapid, cost-effective troubleshooting and live command generation without breaking the budget.
Specifications
- Provider: anthropic
- License: closed
- Context: 1000k tokens
- Released: 2026-09-01
Pros
- Exceptional terminal and command-line reasoning
- Highly cost-effective with 75% cache-read price cut
- Optimized for advanced coding and technical chat
- Impressive 52.6% score on Terminal-Bench Science
Cons
- Lacks native multimodal support like vision or audio
- Optimized primarily for highly technical niches
- Higher baseline cost structure for uncached inputs
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