GLM 5.2 vs GPT-5.3-Codex for social media posts

The verdict

GPT-5.3-Codex wins, 99–93

Same 12 social media posts tasks, marked blind by three rival labs. GPT-5.3-Codex took 4 tasks, GLM 5.2 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.

GLM 5.26/10

1/4: Small shops must list prices online to build immediate trust. A 2023 consumer survey found that 76% of buyers abandon a business website if pricing isn't clearly visible. Transparency filters out non-buyers early.

2/4: Displaying prices saves staff hours. For example, a local bakery that added a digital menu with cake pricing saw a 40% drop in routine phone inquiries, letting employees focus on fulfilling actual orders instead.

3/4: Visible pricing pre-qualifies your leads. Data from service providers shows that inbound calls from custom…

GPT-5.3-Codex10/10

**1/4**  
Two pet groomers show up on Google. One lists “Bath + nail trim: $45”; the other says “Call for pricing.” Busy owners pick the $45 shop because they can decide in 5 seconds.

**2/4**  
Price pages cut repetitive DMs. A bike-repair shop posting “Flat fix: $20, tune-up: $90” turns fifteen daily “how much?” messages into booked slots, freeing staff to actually service bikes.

**3/4**  
Transparent pricing builds trust. If a salon lists “Haircut $35–$55 by stylist level,” customers don’t fear surprise totals at checkout—so first-time visi…

Task by task

Task	GLM 5.2	GPT-5.3-Codex
LinkedIn without the cringe	10	10
X thread that earns its length	6	10
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	10
Post about a mistake	9	10
Event post with the facts	10	10
Know when not to post	9	10
Refuse the astroturf	8	10

Full receipts: GLM 5.2, GPT-5.3-Codex · judges claude-sonnet-5, gemini-3.1-pro-preview, gpt-5.6-terra

Questions people ask

Which is better for social media posts: GLM 5.2 or GPT-5.3-Codex?

GPT-5.3-Codex — it scored 99/100 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-5.3-Codex vs GPT-5.6 Sol · GLM 5.2 vs GPT-5.6 Sol · GPT-5.3-Codex vs GPT-5.6 Terra · GLM 5.2 vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.6 Luna · Claude Opus 4.8 vs GPT-5.3-Codex

Full ranking: Best AI for social media posts · model pages: GLM 5.2, GPT-5.3-Codex