---
title: "Claude Fable 5.1 (Anthropic) - Financial AI Performance - FinanceBenchmark"
description: "Independent evaluation and benchmark scores for Claude Fable 5.1 on financial reasoning."
canonical: "https://financebenchmark.ai/models/claude-fable-5-1"
type: "text/markdown"
---
# Claude Fable 5.1

> Developed by **Anthropic** · Released 2026-09-01 · License: proprietary

## Table of Contents
- [1. Model Profile & Summary](#profile)
- [2. FB Composite Score](#composite-score)
- [3. All Evaluated Benchmarks](#benchmarks)
- [4. Certification & Verification](#verification)

## 1. Model Profile & Summary {#profile}

- **Organization:** Anthropic
- **Release Date:** 2026-09-01
- **License:** proprietary (Proprietary API)
- **Context Window:** 1M
- **FB Certified:** Standard Attribution

## 2. FB Composite Score {#composite-score}

**Composite FB Score: 66.2 / 100**

- Benchmarks Evaluated: **5 of 42**

## 3. All Evaluated Benchmarks {#benchmarks}

| Benchmark | Category | Overall Score | Eval Date | Source |
|:----------|:---------|:-------------:|:---------:|:------:|
| [Finance Agent Benchmark](https://financebenchmark.ai/benchmarks/finance-agent.md) | agentTasks | **58.9%** | 2026-10 | [Paper](https://vals.ai/benchmarks/fabv2) |
| [Excel Modeling Benchmark](https://financebenchmark.ai/benchmarks/emb.md) | documentQA, forensic | **76.7%** | 2026-10 | [Paper](https://vals.ai/benchmarks/emb) |
| [Tax Agent Bench](https://financebenchmark.ai/benchmarks/tax-agent-bench.md) | forensic, agentTasks | **49.2%** | 2026-10 | [Paper](https://vals.ai/benchmarks/tax_agent_bench) |
| [MortgageTax Benchmark](https://financebenchmark.ai/benchmarks/mortgagetax.md) | numerical, forensic | **70.8%** | 2026-09 | [Paper](https://vals.ai/benchmarks/mortgage_tax) |
| [TaxEval v2](https://financebenchmark.ai/benchmarks/taxeval-v2.md) | verification, forensic | **76.0%** | 2026-09 | [Paper](https://vals.ai/benchmarks/taxeval_v2) |

## 4. Certification & Verification {#verification}

Embed live verification badge:

```html
<img src="https://financebenchmark.ai/embed/badge/claude-fable-5-1" alt="Claude Fable 5.1 FinanceBenchmark Score" />
```