Best AI for everyday maths / head-to-head

GPT-5.5 vs GPT-5.6 Lunafor everyday maths

The verdict

Dead heat: 98 each

Same 12 everyday maths tasks, marked blind by three rival labs. Tested 14 Aug 2026.

Where they differed most

The task — Rate to reality

A car does 42 miles per gallon. Petrol is £1.46/litre. One gallon is 4.546 litres. What does a 260-mile journey cost in fuel, to the nearest 10p? Show each step.

GPT-5.510/10
1. **Work out how many gallons are needed:**

\[
\frac{260 \text{ miles}}{42 \text{ miles per gallon}} = 6.1905 \text{ gallons}
\]

2. **Convert gallons to litres:**

\[
6.1905 \times 4.546 = 28.1419 \text{ litres}
\]

3. **Work out the cost:**

\[
28.1419 \times £1.46 = £41.087
\]

4. **Round to the nearest 10p:**

\[
£41.087 \approx £41.10
\]

**The 260-mile journey costs about £41.10 in fuel.**
1. **Gallons of petrol used:**

\[
260 \div 42 = 6.1905\text{ gallons}
\]

2. **Convert gallons to litres:**

\[
6.1905 \times 4.546 = 28.1419\text{ litres}
\]

3. **Calculate the fuel cost:**

\[
28.1419 \times £1.46 = £41.087
\]

4. **Round to the nearest 10p:**

\[
\boxed{£41.10}
\]

The journey costs **£41.10 in fuel**.

Task by task

TaskGPT-5.5GPT-5.6 Luna
VAT both ways1010
Percentage change vs points1010
Unit price comparison1010
Mortgage overpayment intuition1010
Split a bill with a twist1010
Compound vs simple1010
The discount stack1010
Reverse percentage1010
Rate to reality109
Average of averages trap1010
Estimate honestly99
Refuse false precision910

Full receipts: GPT-5.5, GPT-5.6 Luna · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5

Questions people ask

Which is better for everyday maths: GPT-5.5 or GPT-5.6 Luna?

They tied at 98/100 on our everyday maths suite — for this job, pick on price or the product you already use.

How was this tested?

Both models answered the identical published everyday maths 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 maths head-to-heads: Claude Opus 4.8 vs GPT-5.5 · Claude Opus 4.8 vs GPT-5.6 Luna · GPT-5.5 vs GPT-5.6 Sol · GPT-5.6 Luna vs GPT-5.6 Sol · GPT-5.5 vs GPT-5.6 Terra · GPT-5.6 Luna vs GPT-5.6 Terra

Full ranking: Best AI for everyday maths · model pages: GPT-5.5, GPT-5.6 Luna