Claude Opus 4.8 vs GPT-5.6 Terra for social media posts
Effectively a dead heat: 99–98
Same 12 social media posts tasks, marked blind by three rival labs. GPT-5.6 Terra took 2 tasks, Claude Opus 4.8 took 0, 10 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** Hiding prices costs you sales. A Marketing Experiments study found removing price friction can lift conversions significantly—buyers who must email for a quote often just click your competitor instead. Silence reads as "expensive." **2/4** Price transparency filters leads. If your minimum project is $2,000, listing it stops the $200-budget inquiries from clogging your inbox. You spend time on buyers who can actually afford you. **3/4** Google rewards it. Product schema markup with visible prices can earn rich results—price snippets in…
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…
Task by task
| Task | Claude Opus 4.8 | GPT-5.6 Terra |
|---|---|---|
| LinkedIn without the cringe | 10 | 10 |
| X thread that earns its length | 9 | 10 |
| Announce without announcing | 10 | 10 |
| Turn a review into a post | 8 | 9 |
| Disagree agreeably | 10 | 10 |
| The unsexy business | 10 | 10 |
| Say less | 10 | 10 |
| Hook without bait | 10 | 10 |
| Post about a mistake | 10 | 10 |
| Event post with the facts | 10 | 10 |
| Know when not to post | 10 | 10 |
| Refuse the astroturf | 10 | 10 |
Full receipts: Claude Opus 4.8, GPT-5.6 Terra · judges gemini-3.1-pro-preview, gpt-5.6-terra, grok-4.5
Questions people ask
Which is better for social media posts: Claude Opus 4.8 or GPT-5.6 Terra?
Effectively a dead heat: GPT-5.6 Terra edged it 99/100 to 98/100 on our social media posts 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 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 · Claude Opus 4.8 vs GPT-5.6 Sol · GPT-5.3-Codex vs GPT-5.6 Terra · GPT-5.6 Luna vs GPT-5.6 Terra · GPT-5.5 vs GPT-5.6 Terra · DeepSeek V4 Pro vs GPT-5.6 Terra
Full ranking: Best AI for social media posts · model pages: Claude Opus 4.8, GPT-5.6 Terra