Claude Fable 5 vs Claude Opus 4.8 for everyday legal questions

The verdict

Effectively a dead heat: 9493

Same 12 everyday legal questions tasks, marked blind by three rival labs. Claude Opus 4.8 took 1 task, Claude Fable 5 took 0, 11 tied. Tested 16 Aug 2026.

Where they differed most

The task — Hours cut overnight

An employee's rota drops from 30 hours a week to 16 with a week's notice and no discussion. Their contract says '30 hours per week'. Explain what the contract means for a unilateral cut, the difference between working on under protest and quietly accepting the change, who ACAS are and when to involve them, and draft the three questions to put to the manager in writing first. Stress dates, copies and paper trail throughout.

# A Unilateral Cut From 30 to 16 Hours: What It Means and What to Do

*(This is general information for England, Wales and Scotland, not legal advice — but it's the framework ACAS and employment solicitors will use.)*

---## 1. What the contract means

If the written contract says **"30 hours per week"**, that is a contractual term. Hours are not a discretionary perk like a rota preference — they go to the heart of the wage bargain.

An employer **cannot lawfully change a contractual term unilaterally**. To vary the contract they need one of:…
# Unilateral Cut to Contracted Hours

## What the contract means

Your contract states "30 hours per week." That figure is a **contractual term** — it's not a suggestion or a starting point the employer can move at will. Reducing you to 16 hours with a week's notice and no discussion is a **unilateral variation** of your contract, which an employer generally **cannot lawfully do** without one of the following:

- **Your agreement** (express or implied)
- A **flexibility clause** in the contract that specifically permits changes to hours (check…

Task by task

TaskClaude Fable 5Claude Opus 4.8
Landlord with a key99
The unprotected deposit99
Eight-month-old washing machine1010
The scary parking letter99
Translate the clause99
The hedge war99
Hours cut overnight910
The handwritten will99
£600 and a shrug99
It depends what you signed1010
Letter before action1010
Refuse the order workaround1010

Full receipts: Claude Fable 5, Claude Opus 4.8 · judges gemini-3.1-pro-preview, gpt-5.6-terra, grok-4.5

Questions people ask

Which is better for everyday legal questions: Claude Fable 5 or Claude Opus 4.8?

Effectively a dead heat: Claude Opus 4.8 edged it 94/100 to 93/100 on our everyday legal questions suite — too close to matter, so pick on price or the product you already use.

How was this tested?

Both models answered the identical published everyday legal questions tasks. Three AI judges from three different labs scored every answer blind against a fixed rubric; mechanically checkable rules (word limits, banned phrases) are enforced by the test harness in code. The raw outputs and judge verdicts are downloadable.

More everyday legal questions head-to-heads: Claude Opus 4.8 vs GPT-5.6 Sol · Claude Opus 4.8 vs GPT-5.6 Terra · Claude Opus 4.8 vs GPT-5.3-Codex · Claude Opus 4.8 vs GPT-5.5 · Claude Opus 4.8 vs GPT-5.6 Luna · Claude Opus 4.8 vs Kimi K3

Full ranking: Best AI for everyday legal questions · model pages: Claude Fable 5, Claude Opus 4.8