Best AI for revision & study / head-to-head
Claude Opus 4.6 vs GPT-5.3-Codex for revision & study
Dead heat: 88 each
Same 12 revision & study tasks, marked blind by three rival labs. Tested 14 Aug 2026.
Where they differed most
A student has 3 exams (Maths 12 June, Biology 16 June, French 17 June), revises 2 hours on weekdays and 4 at weekends, starting 1 June. Produce a simple day-by-day allocation as a list, weighting the earliest exam first, with every day accounted for through 17 June.
# Revision Timetable: 1–17 June **Key dates:** Maths 📐 12 June | Biology 🧬 16 June | French 🇫🇷 17 June | Day | Date | Hours | Allocation | Rationale | |-----|------|-------|------------|-----------| | Sun | 1 Jun | 4 h | Maths 4 | Earliest exam gets full focus | | Mon | 2 Jun | 2 h | Maths 2 | | | Tue | 3 Jun | 2 h | Maths 2 | | | Wed | 4 Jun | 2 h | Maths 2 | | | Thu | 5 Jun | 2 h | Maths 2 | | | Fri | 6 Jun | 2 h | Maths 1 · Biology 1 | Start mixing in Biology | | Sat | 7 Jun | 4 h | Maths 2 · Biology 2 | Weekend — longer session | | Su…
Here’s a simple weighted plan (earliest exam first), accounting for every day from **1–17 June**. > **Assumption:** June 1 is a **Saturday** (so weekends are 1–2, 8–9, 15–16). > Daily total = **2h weekdays**, **4h weekends**. - **1 Jun (Sat) – 4h:** Maths 3h, Biology 0.5h, French 0.5h - **2 Jun (Sun) – 4h:** Maths 3h, Biology 0.5h, French 0.5h - **3 Jun (Mon) – 2h:** Maths 1.5h, Biology 0.5h - **4 Jun (Tue) – 2h:** Maths 1.5h, French 0.5h - **5 Jun (Wed) – 2h:** Maths 1.5h, Biology 0.5h - **6 Jun (Thu) – 2h:** Maths 1.5h, French 0…
Task by task
| Task | Claude Opus 4.6 | GPT-5.3-Codex |
|---|---|---|
| Condense a topic | 10 | 9 |
| Flashcards that test | 10 | 10 |
| Explain then check | 9 | 9 |
| The exam answer plan | 5 | 5 |
| Mnemonic that works | 8 | 10 |
| Spot the misconception | 10 | 10 |
| Timetable the revision | 5 | 8 |
| Simplify without losing truth | 9 | 9 |
| Quiz from notes | 10 | 9 |
| Compare for the exam | 10 | 9 |
| The night-before triage | 10 | 8 |
| Refuse to do the homework | 10 | 10 |
Full receipts: Claude Opus 4.6, GPT-5.3-Codex · judges gemini-3.1-pro-preview, gpt-5.6-terra, grok-4.5
Questions people ask
Which is better for revision & study: Claude Opus 4.6 or GPT-5.3-Codex?
They tied at 88/100 on our revision & study suite — for this job, 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: Claude Opus 4.6 vs GPT-5.6 Sol · GPT-5.3-Codex vs GPT-5.6 Sol · Claude Opus 4.6 vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.6 Terra · Claude Opus 4.6 vs GPT-5.5 · GPT-5.3-Codex vs GPT-5.5
Full ranking: Best AI for revision & study · model pages: Claude Opus 4.6, GPT-5.3-Codex