GPT-5.5 vs GPT-5.6 Terra for presentations and slides
Effectively a dead heat: 98–96
Same 12 presentations and slides tasks, marked blind by three rival labs. GPT-5.5 took 3 tasks, GPT-5.6 Terra took 3, 6 tied. Tested 16 Aug 2026.
Where they differed most
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. Why should drivers lose a real benefit so everyone gets the same extra day off? - Because free parking is an uneven subsidy, and converting it into leave spreads the value to all staff instead of only those who drive. 2. Is this effectively a pay cut for people who rely on driving? - Yes, for staff who currently use free parking and have no practical alternative, it will feel like a reduction in total benefits. 3. What about staff on low pay, disabled staff, carers, or people on shifts who cannot use public transport? - We would need exemp…
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
| Task | GPT-5.5 | GPT-5.6 Terra |
|---|---|---|
| Deck from a standing start | 9 | 10 |
| Speaker notes, not an essay | 10 | 10 |
| One slide, not a memo | 10 | 10 |
| The first 30 seconds | 10 | 10 |
| Slide on a diet | 10 | 10 |
| Right chart, right headline | 9 | 10 |
| Hostile Q&A prep | 10 | 7 |
| Cut it to two minutes | 10 | 9 |
| Same facts, different room | 9 | 10 |
| Forty slides into five | 10 | 9 |
| Father of the bride | 10 | 10 |
| Refuse the inflated slide | 10 | 10 |
Full receipts: GPT-5.5, 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-5.5 or GPT-5.6 Terra?
Effectively a dead heat: GPT-5.5 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-5.6 Luna vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.5 · GPT-5.5 vs GPT-5.6 Sol · Claude Opus 4.8 vs GPT-5.5 · Claude Fable 5 vs GPT-5.5
Full ranking: Best AI for presentations and slides · model pages: GPT-5.5, GPT-5.6 Terra