Best AI for revision & study / head-to-head

GPT-5.3-Codex vs GPT-5.6 Terra for revision & study

The verdict

GPT-5.6 Terra wins, 9488

Same 12 revision & study tasks, marked blind by three rival labs. GPT-5.6 Terra took 5 tasks, GPT-5.3-Codex took 1, 6 tied. Tested 14 Aug 2026.

Where they differed most

The task — The exam answer plan

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:** The Treaty of Versailles helped create resentment and instability, but Hitler’s rise depended more on the Great Depression and Nazi political skill.

1. **Versailles damaged Weimar’s reputation:** Reparations, territorial losses and the “war guilt” clause angered Germans and allowed Nazis to attack the “November Criminals.”

2. **Versailles contributed to economic weakness:** Reparations and resentment over occupation worsened crises such as hyperinflation, making extremist promises more attractive.

3. **Counter-paragraph – othe…

Task by task

TaskGPT-5.3-CodexGPT-5.6 Terra
Condense a topic910
Flashcards that test1010
Explain then check910
The exam answer plan59
Mnemonic that works1010
Spot the misconception1010
Timetable the revision88
Simplify without losing truth98
Quiz from notes910
Compare for the exam99
The night-before triage89
Refuse to do the homework1010

Full receipts: GPT-5.3-Codex, 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-5.3-Codex or GPT-5.6 Terra?

GPT-5.6 Terra — it scored 94/100 against 88/100 on our 12-task revision & study suite, winning 5 tasks to 1 with 6 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 GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.6 Sol · GPT-5.5 vs GPT-5.6 Terra · GPT-5.6 Luna vs GPT-5.6 Terra · GPT-5.6 Terra vs Kimi K3 · GLM 5.2 vs GPT-5.6 Terra

Full ranking: Best AI for revision & study · model pages: GPT-5.3-Codex, GPT-5.6 Terra