Best AI for revision & study / head-to-head
GPT-5.3-Codex vs GPT-5.6 Luna for revision & study
GPT-5.6 Luna wins, 91–88
Same 12 revision & study tasks, marked blind by three rival labs. GPT-5.6 Luna took 4 tasks, GPT-5.3-Codex took 1, 7 tied. Tested 14 Aug 2026.
Where they differed most
Make revision notes on photosynthesis for GCSE level: maximum 10 bullet points, each under 15 words, must include the word equation, no sub-bullets.
- Photosynthesis makes glucose using light energy in plant chloroplasts. - Chlorophyll absorbs mainly red and blue light for photosynthesis. - Word equation: carbon dioxide + water → glucose + oxygen. - Carbon dioxide enters leaves through stomata by diffusion. - Water is absorbed by roots and transported in xylem. - Glucose is used for respiration, growth, and making cellulose. - Excess glucose is stored as starch in leaves and roots. - Photosynthesis rate increases with light intensity, temperature, and carbon dioxide concentrat…
- Photosynthesis is the process plants use to make glucose using light energy. - It occurs mainly in chloroplasts, which contain the green pigment chlorophyll. - Word equation: carbon dioxide + water → glucose + oxygen. - Carbon dioxide enters leaves through tiny holes called stomata. - Water is absorbed from soil by roots and transported through xylem. - Chlorophyll absorbs light energy needed for photosynthesis. - Glucose provides energy through respiration and is used to make cellulose. - Excess glucose is converted into insoluble starch for…
Task by task
| Task | GPT-5.3-Codex | GPT-5.6 Luna |
|---|---|---|
| Condense a topic | 9 | 10 |
| Flashcards that test | 10 | 10 |
| Explain then check | 9 | 9 |
| The exam answer plan | 5 | 5 |
| Mnemonic that works | 10 | 10 |
| Spot the misconception | 10 | 9 |
| Timetable the revision | 8 | 8 |
| Simplify without losing truth | 9 | 9 |
| Quiz from notes | 9 | 10 |
| Compare for the exam | 9 | 10 |
| The night-before triage | 8 | 9 |
| Refuse to do the homework | 10 | 10 |
Full receipts: GPT-5.3-Codex, GPT-5.6 Luna · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5
Questions people ask
Which is better for revision & study: GPT-5.3-Codex or GPT-5.6 Luna?
GPT-5.6 Luna — it scored 91/100 against 88/100 on our 12-task revision & study suite, winning 4 tasks to 1 with 7 tied. Every answer was marked blind by three judges from three rival AI labs.
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 Luna vs GPT-5.6 Sol · GPT-5.3-Codex vs GPT-5.6 Sol · GPT-5.6 Luna vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.6 Terra · GPT-5.5 vs GPT-5.6 Luna · GPT-5.3-Codex vs GPT-5.5
Full ranking: Best AI for revision & study · model pages: GPT-5.3-Codex, GPT-5.6 Luna