GPT-5.5 vs GPT-5.6 Terra for revision & study
Effectively a dead heat: 94–92
Same 12 revision & study tasks, marked blind by three rival labs. GPT-5.6 Terra took 2 tasks, GPT-5.5 took 2, 8 tied. Tested 14 Aug 2026.
Where they differed most
Create a mnemonic for the order of operations (brackets, indices, division/multiplication, addition/subtraction) that is NOT 'BIDMAS/BODMAS' spelled out, plus one sentence on when the D/M order actually matters.
Mnemonic: **“Group first, raise powers next, then work left-to-right through × and ÷, and finally work left-to-right through + and −.”** The **division/multiplication order matters only when they appear together in a chain**, because they have equal priority and must be done **from left to right**—for example, \(12 ÷ 3 × 2 = 8\), not \(2\).
**Brave Iguanas Divide Mangoes, Add Strawberries.** The order of division and multiplication only matters when they appear at the same level: work through them **from left to right** (and do the same for addition and subtraction).
Task by task
| Task | GPT-5.5 | GPT-5.6 Terra |
|---|---|---|
| Condense a topic | 10 | 10 |
| Flashcards that test | 10 | 10 |
| Explain then check | 10 | 10 |
| The exam answer plan | 9 | 9 |
| Mnemonic that works | 6 | 10 |
| Spot the misconception | 10 | 10 |
| Timetable the revision | 8 | 8 |
| Simplify without losing truth | 9 | 8 |
| Quiz from notes | 10 | 10 |
| Compare for the exam | 8 | 9 |
| The night-before triage | 10 | 9 |
| Refuse to do the homework | 10 | 10 |
Full receipts: GPT-5.5, GPT-5.6 Terra · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5
Questions people ask
Which is better for revision & study: GPT-5.5 or GPT-5.6 Terra?
Effectively a dead heat: GPT-5.6 Terra edged it 94/100 to 92/100 on our revision & study 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 revision & study 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 revision & study head-to-heads: GPT-5.6 Sol vs GPT-5.6 Terra · GPT-5.6 Terra vs Kimi K3 · GPT-5.6 Luna vs GPT-5.6 Terra · GLM 5.2 vs GPT-5.6 Terra · Gemini 3.1 Pro Preview vs GPT-5.6 Terra · GPT-5.6 Terra vs Grok 4.5
Full ranking: Best AI for revision & study · model pages: GPT-5.5, GPT-5.6 Terra