GPT-5.6 Luna vs GPT-5.6 Terra for presentations and slides

The verdict

Effectively a dead heat: 9896

Same 12 presentations and slides tasks, marked blind by three rival labs. GPT-5.6 Luna took 3 tasks, GPT-5.6 Terra took 3, 6 tied. Tested 16 Aug 2026.

Where they differed most

The task — Hostile Q&A prep

You are presenting a proposal to cut free staff parking to fund an extra day of annual leave for everyone. Write the 5 hardest questions the audience will actually ask, numbered 1-5, one line each with the honest one-sentence answer on the same line after a dash. No sub-points, no softballs.

1. **How much will this actually cost staff who currently rely on free parking?** — It will be a real pay cut for regular parkers, and the extra leave will not fully offset that cost for everyone.  
2. **Why should people who do not drive receive the same extra leave as those who lose parking?** — Because the proposal is a workforce-wide benefit funded by a targeted change, though that distribution will feel unfair to some drivers.  
3. **Do parking charges genuinely raise enough money to fund an extra day of leave?** — Only if usage, pricing,…
1. Why should staff who drive subsidise an extra day of leave that benefits everyone? — Because the proposal redirects a broad employer-funded benefit into a universal one, while recognising that this creates a disproportionate impact on regular drivers.  
2. How much will parking cost me personally, and will charges vary by salary, shift pattern, or site? — The proposed charge and any concessions must be published upfront, with lower-paid staff, disabled colleagues, and unsocial-hours workers protected where practical.  
3. What evidence shows…

Task by task

TaskGPT-5.6 LunaGPT-5.6 Terra
Deck from a standing start910
Speaker notes, not an essay1010
One slide, not a memo910
The first 30 seconds1010
Slide on a diet1010
Right chart, right headline1010
Hostile Q&A prep107
Cut it to two minutes109
Same facts, different room1010
Forty slides into five109
Father of the bride910
Refuse the inflated slide1010

Full receipts: GPT-5.6 Luna, GPT-5.6 Terra · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5

Questions people ask

Which is better for presentations and slides: GPT-5.6 Luna or GPT-5.6 Terra?

Effectively a dead heat: GPT-5.6 Luna edged it 98/100 to 96/100 on our presentations and slides 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 presentations and slides 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 presentations and slides head-to-heads: GPT-5.5 vs GPT-5.6 Luna · GPT-5.3-Codex vs GPT-5.6 Luna · GPT-5.6 Luna vs GPT-5.6 Sol · Claude Opus 4.8 vs GPT-5.6 Luna · Claude Fable 5 vs GPT-5.6 Luna · DeepSeek V4 Pro vs GPT-5.6 Luna

Full ranking: Best AI for presentations and slides · model pages: GPT-5.6 Luna, GPT-5.6 Terra