GPT-5.6 Terra vs Grok 4.5 for social media posts
GPT-5.6 Terra wins, 99–93
Same 12 social media posts tasks, marked blind by three rival labs. GPT-5.6 Terra took 3 tasks, Grok 4.5 took 0, 9 tied. Tested 16 Aug 2026.
Where they differed most
Write a 4-post X thread (label each 1/4 to 4/4, max 40 words per post) explaining why small shops should list prices on their website. Each post must contain one concrete fact or example — no post may be pure transition or throat-clearing.
1/4 A salon that lists “haircuts from $35” saves customers from calling just to ask the first question. Clear prices reduce friction and help people decide whether the shop fits their budget. 2/4 A repair shop that posts a $90 diagnostic fee prevents surprise. Customers who accept that fee are more likely to book; customers who cannot afford it learn before taking staff time. 3/4 A café showing a $12 sandwich and $4 coffee helps lunch customers compare options quickly. Hidden prices can make a small shop look less convenient than a competitor…
1/4 Customers expect prices. Nielsen data shows 59% of shoppers prefer brands transparent on costs. Small shops build instant trust by listing them, matching what buyers already see from larger rivals. 2/4 It saves staff time. One hardware store cut “how much?” calls 50% after adding website prices, letting employees focus on in-person help and higher-value service instead of repeating basics. 3/4 Conversions rise fast. A boutique clothing shop saw online revenue jump 35% in three months once prices appeared—browsers turned into buyers when t…
Task by task
| Task | GPT-5.6 Terra | Grok 4.5 |
|---|---|---|
| LinkedIn without the cringe | 10 | 10 |
| X thread that earns its length | 10 | 6 |
| Announce without announcing | 10 | 10 |
| Turn a review into a post | 9 | 9 |
| Disagree agreeably | 10 | 10 |
| The unsexy business | 10 | 10 |
| Say less | 10 | 10 |
| Hook without bait | 10 | 9 |
| Post about a mistake | 10 | 8 |
| Event post with the facts | 10 | 10 |
| Know when not to post | 10 | 10 |
| Refuse the astroturf | 10 | 10 |
Full receipts: GPT-5.6 Terra, Grok 4.5 · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5
Questions people ask
Which is better for social media posts: GPT-5.6 Terra or Grok 4.5?
GPT-5.6 Terra — it scored 99/100 against 93/100 on our 12-task social media posts suite, winning 3 tasks to 0 with 9 tied. Every answer was marked blind by three judges from three rival AI labs.
How was this tested?
Both models answered the identical published social media posts 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 social media posts head-to-heads: GPT-5.6 Sol vs GPT-5.6 Terra · GPT-5.6 Sol vs Grok 4.5 · GPT-5.3-Codex vs GPT-5.6 Terra · GPT-5.6 Luna vs GPT-5.6 Terra · Claude Opus 4.8 vs GPT-5.6 Terra · GPT-5.5 vs GPT-5.6 Terra
Full ranking: Best AI for social media posts · model pages: GPT-5.6 Terra, Grok 4.5