GPT-5.3-Codex vs GPT-5.6 Sol for everyday legal questions
Effectively a dead heat: 94–93
Same 12 everyday legal questions tasks, marked blind by three rival labs. GPT-5.6 Sol took 3 tasks, GPT-5.3-Codex took 1, 8 tied. Tested 16 Aug 2026.
Where they differed most
England: a tenant paid a £950 deposit in 2023, the tenancy has now ended, the landlord is dodging questions, and the deposit shows up in none of the three protection schemes' online checkers. Explain in plain English what deposit protection is, why an unprotected deposit changes the tenant's leverage — including that courts can award more than the deposit itself — the realistic sequence of steps, and where free help lives (Shelter, Citizens Advice).
Here’s the plain-English version for **England**. ## What “deposit protection” means If you paid a tenancy deposit for an AST (most private rentals), the landlord/agent must, within **30 days** of getting it: 1. Put it in a government-approved scheme - **DPS**, **TDS**, or **mydeposits** 2. Give you the “prescribed information” (details of where/how it’s protected, how disputes work, etc.) If they don’t do both in time, they’ve broken the rules. --- ## Why this gives the tenant leverage If the deposit was not properly protected, the…
## What deposit protection means For most private tenancies in England, a landlord or letting agent who takes a cash tenancy deposit must: 1. protect it in one of the three government-authorised schemes: - Deposit Protection Service (DPS) - MyDeposits - Tenancy Deposit Scheme (TDS) 2. protect it within **30 calendar days of receiving it**; and 3. give the tenant the required “prescribed information” about the scheme within the same 30 days. The scheme either holds the money or insures it. At the end of the tenancy, it provides a fre…
Task by task
| Task | GPT-5.3-Codex | GPT-5.6 Sol |
|---|---|---|
| Landlord with a key | 9 | 9 |
| The unprotected deposit | 9 | 10 |
| Eight-month-old washing machine | 10 | 9 |
| The scary parking letter | 9 | 9 |
| Translate the clause | 9 | 9 |
| The hedge war | 9 | 10 |
| Hours cut overnight | 9 | 9 |
| The handwritten will | 9 | 10 |
| £600 and a shrug | 9 | 9 |
| It depends what you signed | 9 | 9 |
| Letter before action | 10 | 10 |
| Refuse the order workaround | 10 | 10 |
Full receipts: GPT-5.3-Codex, GPT-5.6 Sol · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5
Questions people ask
Which is better for everyday legal questions: GPT-5.3-Codex or GPT-5.6 Sol?
Effectively a dead heat: GPT-5.6 Sol 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-5.3-Codex · GPT-5.6 Sol vs GPT-5.6 Terra · GPT-5.5 vs GPT-5.6 Sol · Claude Fable 5 vs GPT-5.6 Sol · GPT-5.6 Luna vs GPT-5.6 Sol
Full ranking: Best AI for everyday legal questions · model pages: GPT-5.3-Codex, GPT-5.6 Sol