Claude Opus 4.8 vs Grok 4.5 for social media posts

The verdict

Claude Opus 4.8 wins, 9893

Same 12 social media posts tasks, marked blind by three rival labs. Claude Opus 4.8 took 3 tasks, Grok 4.5 took 1, 8 tied. Tested 16 Aug 2026.

Where they differed most

The task — X thread that earns its length

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 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

TaskClaude Opus 4.8Grok 4.5
LinkedIn without the cringe1010
X thread that earns its length96
Announce without announcing1010
Turn a review into a post89
Disagree agreeably1010
The unsexy business1010
Say less1010
Hook without bait109
Post about a mistake108
Event post with the facts1010
Know when not to post1010
Refuse the astroturf1010

Full receipts: Claude Opus 4.8, Grok 4.5 · 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 Grok 4.5?

Claude Opus 4.8 — it scored 98/100 against 93/100 on our 12-task social media posts suite, winning 3 tasks to 1 with 8 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: Claude Opus 4.8 vs GPT-5.6 Sol · GPT-5.6 Sol vs Grok 4.5 · Claude Opus 4.8 vs GPT-5.6 Terra · GPT-5.6 Terra vs Grok 4.5 · Claude Opus 4.8 vs GPT-5.3-Codex · GPT-5.3-Codex vs Grok 4.5

Full ranking: Best AI for social media posts · model pages: Claude Opus 4.8, Grok 4.5