GPT-5.6 Sol vs Grok 4.5 for social media posts

The verdict

GPT-5.6 Sol wins, 100–93

Same 12 social media posts tasks, marked blind by three rival labs. GPT-5.6 Sol took 4 tasks, Grok 4.5 took 0, 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.

GPT-5.6 Sol10/10

**1/4** Visible prices reduce friction. A customer who sees “haircuts from $35” can book immediately instead of leaving your site to compare or message competitors.

**2/4** Prices qualify leads before they contact you. If a custom cake starts at $80, shoppers with a $30 budget know early—saving everyone an awkward exchange.

**3/4** Published prices save staff time. Answering “How much is it?” ten times daily can become one clear menu showing a $12 lunch special or $25 repair fee.

**4/4** Transparency builds trust and prevents surprises. List…

Grok 4.56/10

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 Sol	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	10	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 Sol, 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 Sol or Grok 4.5?

GPT-5.6 Sol — it scored 100/100 against 93/100 on our 12-task social media posts suite, winning 4 tasks to 0 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: GPT-5.6 Sol vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.6 Sol · GPT-5.6 Luna vs GPT-5.6 Sol · Claude Opus 4.8 vs GPT-5.6 Sol · GPT-5.5 vs GPT-5.6 Sol · DeepSeek V4 Pro vs GPT-5.6 Sol

Full ranking: Best AI for social media posts · model pages: GPT-5.6 Sol, Grok 4.5