GPT-5.6 Sol vs Kimi K3 for bookkeeping

The verdict

GPT-5.6 Sol wins, 9384

Same 12 bookkeeping tasks, marked blind by three rival labs. GPT-5.6 Sol took 7 tasks, Kimi K3 took 1, 4 tied. Tested 18 Aug 2026.

Where they differed most

The task — Capital or revenue

Guidance excerpt: 'Capital expenditure is money spent acquiring, creating or improving an asset that will be used in the business over more than one accounting period. Revenue expenditure is the day-to-day running cost of the business, including repairs that restore an asset to its previous condition without improving it. Where a payment restores an asset to working order it is generally a repair; where it materially improves the asset or extends its life beyond its original condition, it is generally capital. Businesses may set a capitalisation threshold below which small items are treated as revenue for practicality.' Classify these six, using only the excerpt. Return only the classification — exactly 6 bullets, in the order given, one line each, no sub-points. Each line: the item, capital or revenue, and the words from the excerpt that decide it. Where the excerpt genuinely leaves it arguable, say so on that line and name the fact you would need. 1) New laptop, £1,100. 2) Repair to the same laptop's screen, £180. 3) New shelving racking for the storeroom, £340. 4) Annual accounting software subscription, £480. 5) Replacement engine for the works van, £2,200. 6) Van MOT and service, £54.

- New laptop, £1,100 — capital, unless below the business’s capitalisation threshold; “acquiring…an asset that will be used…over more than one accounting period”; need the threshold.
- Repair to the same laptop’s screen, £180 — revenue; “repairs that restore an asset to its previous condition without improving it.”
- New shelving racking for the storeroom, £340 — capital, unless below the business’s capitalisation threshold; “acquiring…an asset that will be used…over more than one accounting period”; need the threshold.
- Annual accounting soft…
- New laptop, £1,100 — **capital (arguable)**: “acquiring ... an asset ... used ... over more than one accounting period”; fact needed: the business’s capitalisation threshold, if any.
- Repair to the same laptop's screen, £180 — **revenue**: “restores an asset to working order” and “without improving it.”
- New shelving racking for the storeroom, £340 — **capital (arguable)**: “acquiring ... an asset ... used ... over more than one accounting period”; fact needed: the business’s capitalisation threshold, if any.
- Annual accounting software su…

Task by task

TaskGPT-5.6 SolKimi K3
The client lunch and the sandwich88
Categorise, and admit what you cannot98
The invoice totals1010
Find the £36910
Profit but no money88
Not your decision to make109
The faded shoebox108
It is my company, it is my money88
The mileage claim109
Capital or revenue106
Quote, invoice, receipt98
Refuse the backdated invoice109

Full receipts: GPT-5.6 Sol, Kimi K3 · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5

Questions people ask

Which is better for bookkeeping: GPT-5.6 Sol or Kimi K3?

GPT-5.6 Sol — it scored 93/100 against 84/100 on our 12-task bookkeeping suite, winning 7 tasks to 1 with 4 tied. Every answer was marked blind by three judges from three rival AI labs.

How was this tested?

Both models answered the identical published bookkeeping 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 bookkeeping head-to-heads: GPT-5.5 vs GPT-5.6 Sol · GPT-5.6 Sol vs Grok 4.5 · Claude Opus 4.8 vs GPT-5.6 Sol · GLM 5.2 vs GPT-5.6 Sol · Claude Sonnet 5 vs GPT-5.6 Sol · Gemini 3.5 Flash vs GPT-5.6 Sol

Full ranking: Best AI for bookkeeping · model pages: GPT-5.6 Sol, Kimi K3