Best AI for revision & study / head-to-head
GPT-5.3-Codex vs Kimi K3 for revision & study
Kimi K3 wins, 91–88
Same 12 revision & study tasks, marked blind by three rival labs. Kimi K3 took 5 tasks, GPT-5.3-Codex took 3, 4 tied. Tested 14 Aug 2026.
Where they differed most
Plan a 12-mark GCSE history answer on 'How far was the Treaty of Versailles responsible for the rise of Hitler?' Give: a one-line judgement, 3 paragraph topics (one line each), and what the counter-paragraph concedes. No essay, just the plan, under 120 words.
**Judgement:** The Treaty of Versailles was an important long-term cause, but Hitler rose mainly because the Great Depression and Weimar political weakness created the immediate conditions for Nazi success. **Para 1 (agree):** Versailles fuelled resentment (“Diktat”), war guilt, reparations, and territorial losses, giving Hitler powerful nationalist propaganda. **Para 2 (main factor):** The 1929 Depression caused mass unemployment and desperation; Nazi promises of jobs, unity, and strength won millions of new voters. **Para 3 (other factor):…
**Judgement:** Versailles was an important underlying cause, but the Depression and political intrigue were more directly responsible for Hitler's rise. **Paragraph 1:** Versailles — reparations, war guilt and territorial losses created lasting resentment that Hitler skilfully exploited in his propaganda. **Paragraph 2:** The Great Depression — mass unemployment after 1929 drove millions towards Nazi promises of jobs and strong leadership. **Paragraph 3 (counter):** Hitler's personal appeal and elite manoeuvring — oratory, SA intimidation, a…
Task by task
| Task | GPT-5.3-Codex | Kimi K3 |
|---|---|---|
| Condense a topic | 9 | 10 |
| Flashcards that test | 10 | 10 |
| Explain then check | 9 | 8 |
| The exam answer plan | 5 | 9 |
| Mnemonic that works | 10 | 9 |
| Spot the misconception | 10 | 10 |
| Timetable the revision | 8 | 8 |
| Simplify without losing truth | 9 | 10 |
| Quiz from notes | 9 | 10 |
| Compare for the exam | 9 | 5 |
| The night-before triage | 8 | 10 |
| Refuse to do the homework | 10 | 10 |
Full receipts: GPT-5.3-Codex, Kimi K3 · 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 Kimi K3?
Kimi K3 — it scored 91/100 against 88/100 on our 12-task revision & study suite, winning 5 tasks to 3 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 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 Kimi K3 · GPT-5.3-Codex vs GPT-5.6 Sol · GPT-5.6 Terra vs Kimi K3 · GPT-5.3-Codex vs GPT-5.6 Terra · GPT-5.5 vs Kimi K3 · GPT-5.3-Codex vs GPT-5.5
Full ranking: Best AI for revision & study · model pages: GPT-5.3-Codex, Kimi K3