Grok 4.5 vs Kimi K3 for property and lettings admin

The verdict

Kimi K3 wins, 9083

Same 12 property and lettings admin tasks, marked blind by three rival labs. Kimi K3 took 5 tasks, Grok 4.5 took 2, 5 tied. Tested 18 Aug 2026.

Where they differed most

The task — The pre-tenancy checklist

Guidance excerpt: 'Before a new assured shorthold tenancy in England begins, a landlord or agent is generally expected to have the following in place. (1) A current gas safety record where there are gas appliances, renewed every 12 months, with a copy given to the tenant before they move in. (2) An Electrical Installation Condition Report, normally renewed at least every 5 years, with a copy given to the tenant before occupation. (3) A valid Energy Performance Certificate, given to the tenant, with the property meeting the minimum energy efficiency standard that applies. (4) Working smoke alarms on every storey and a carbon monoxide alarm in any room with a fixed combustion appliance, tested at the start of the tenancy. (5) The current government How to Rent guide, served in the correct format. (6) Any licence required by the local authority for the property, which varies by area and by property type. Requirements change: confirm the current position with the local authority and at source before letting.' A tenancy starts on 1 October. Return only the checklist — exactly 6 bullets, in the order given above, one line each, no sub-points, no preamble. Each line: what it is, when it must be done by, and what the excerpt says happens or is required. Where the excerpt gives no renewal period or deadline for that item, say so on that line and name what you would check.

- Gas safety record: current (renewed every 12 months) with copy given to tenant by 1 October before move-in.
- Electrical Installation Condition Report: normally renewed at least every 5 years with copy given to tenant by 1 October before occupation.
- Energy Performance Certificate: valid and given to tenant by 1 October with property meeting minimum energy efficiency standard (excerpt gives no renewal period; check validity and current MEES).
- Working smoke alarms on every storey and CO alarm in rooms with fixed combustion appliance: tested…
Kimi K310/10
- Gas safety record (where there are gas appliances): must be current and renewed every 12 months, with a copy given to the tenant before they move in on 1 October.
- Electrical Installation Condition Report: must be renewed at least every 5 years, with a copy given to the tenant before occupation on 1 October.
- Energy Performance Certificate: a valid EPC must be given to the tenant and the property must meet the minimum energy efficiency standard that applies; the excerpt gives no renewal period or deadline, so check the current EPC validity…

Task by task

TaskGrok 4.5Kimi K3
Two routes, one worried tenant99
Six weeks late and hoping89
Write only the arrears email810
The pre-tenancy checklist710
Write only the renewal reply1010
Three repairs, one Tuesday98
The nine-year-old carpet58
The rent rise by text message98
Every claim in the advert must be true89
The compliance data, as JSON1010
What the agent must not promise88
Refuse the lock change99

Full receipts: Grok 4.5, Kimi K3 · judges claude-sonnet-5, gemini-3.1-pro-preview, gpt-5.6-terra

Questions people ask

Which is better for property and lettings admin: Grok 4.5 or Kimi K3?

Kimi K3 — it scored 90/100 against 83/100 on our 12-task property and lettings admin suite, winning 5 tasks to 2 with 5 tied. Every answer was marked blind by three judges from three rival AI labs.

How was this tested?

Both models answered the identical published property and lettings admin 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 property and lettings admin head-to-heads: GPT-5.5 vs Kimi K3 · GPT-5.5 vs Grok 4.5 · GPT-5.6 Sol vs Kimi K3 · GPT-5.6 Sol vs Grok 4.5 · Claude Opus 4.8 vs Kimi K3 · Claude Fable 5 vs Kimi K3

Full ranking: Best AI for property and lettings admin · model pages: Grok 4.5, Kimi K3