Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. GLM 5.3 Primevso3 Mini
Updated Sep 2026

GLM 5.3 Primevso3 Mini

o3 Mini is cheaper than GLM 5.3 Prime at $1.1/M vs $2.8/M input tokens.

GLM 5.3 Prime and o3 Mini compared across 16 shared prompts
SpecGLM 5.3 Primeo3 Mini
Input price$2.8/M tokens$1.1/M tokens
Output price$8.8/M tokens$4.4/M tokens
Context window1.0M tokens64K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedSep 2026Dec 2024
Side by side

Same prompt, both answers

Opening lines from 2 of the 16 prompts both answered. Formatting stripped, words untouched.

Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

GLM 5.3 Prime510 words
HarborTech Services – LBO Underwriting Summary Entry Economics EV = 12.0x × $120m = $1,440m; fees = 2% × 1,440 = $28.8m; total uses = $1,468.8m Debt: Term Loan = 4.0x × 120 = $480m (9% cash, 1%/yr amort); Mezz = 1.5x × 120 = $180m (12% cash + 2% PIK) Sponsor equity = 1,468.8 − 660 = $808.8m (~55% of cap) Annual Model…
Read the full answer
o3 Mini1,203 words
Below is one acceptable “short‐cut” working paper that shows the key steps. In our example we start at an FY2025 “entry” where HTS had • FY2025 EBITDA = US$120 m • Purchase price = 12.0× EBITDA = US$1,440 m • Total debt = 5.5× EBITDA = US$660 m, split as: – Term Loan = 4.0× EBITDA = US$480 m (9.0% cash interest…
Read the full answer

Advanced Investment Memo (IC Memo)

You are writing an internal investment committee memo for a long/short equity fund. Company (fictional): LedgerLift (ticker: LLLT) – B2B…

GLM 5.3 Prime1,086 words
IC Memo: LedgerLift (LLLT) — B2B Spend Management SaaS Analyst: L/S Equity Fund Date: Internal draft Fictional exercise — not investment advice Recommendation SHORT. 12-month price target range: $32–$40 (current: $46).
Read the full answer
o3 Mini1,281 words
Internal Memo – LedgerLift (LLLT) Date: [Insert Date] ───────────────────────────── Recommendation & 12-Month Price Target Recommendation: SHORT 12-Month Price Target Range: $17 – $28/share Thesis: LedgerLift’s current trading price of $46 appears significantly expanded relative to our DCF valuations across base, bull…
Read the full answer
Our Verdict
GLM 5.3 Prime
GLM 5.3 Prime
o3 Mini
o3 MiniRunner-up

Not enough votes to call it. On the specs, GLM 5.3 Prime has the edge: bigger model tier, newer, bigger context window.

Too close to call
API pricing

Cost per 1M tokens

GLM 5.3 Prime
Input
$2.80
Output
$8.80
o3 Mini
Input
$1.10
2.5× cheaper
Output
$4.40
2.0× cheaper

o3 Mini is cheaper on both: 2.5× input, 2.0× output.

Where to run it

2 hosts

GLM 5.3 Prime1 host
HostInOutContextUptime
Alibaba Cloud$2.80 in·$8.80 out·1M·99.9% up
o3 Mini1 host
HostInOutContextUptime
OpenAI$1.10 in·$4.40 out·200k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

GLM 5.3 Prime is developed by Z.ai while o3 Mini is developed by OpenAI. GLM 5.3 Prime has a 1.0M token context window vs o3 Mini's 64K. You can compare their actual outputs across 16 challenges on Rival to see how they differ in practice.

It depends on your use case. GLM 5.3 Prime and o3 Mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 16 challenges so you can judge which fits your needs best.

GLM 5.3 Prime costs $2.8/M input tokens and o3 Mini costs $1.1/M input tokens. o3 Mini is $1.70/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of GLM 5.3 Prime and o3 Mini across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Keep exploring

More comparisons

Against the newest arrivals

GLM 5.3 Prime logoSolar Mini 4 logo
GLM 5.3 Prime vs Solar Mini 4Landed Sep 2026
o3 Mini logoQwen3.8 Max Prime logo
o3 Mini vs Qwen3.8 Max PrimeLanded Sep 2026
GLM 5.3 Prime logoQwen3.8 Omni Flash logo
GLM 5.3 Prime vs Qwen3.8 Omni FlashLanded Sep 2026
o3 Mini logoCommand A+ logo
o3 Mini vs Command A+Landed Sep 2026
GLM 5.3 Prime logoClaude Opus 5.5 logo
GLM 5.3 Prime vs Claude Opus 5.5Landed Sep 2026
o3 Mini logoGPT-6 Luna Pro logo
o3 Mini vs GPT-6 Luna ProLanded Sep 2026
GLM 5.3 Prime logoGPT-6 Sol Pro logo
GLM 5.3 Prime vs GPT-6 Sol ProLanded Sep 2026
o3 Mini logoGPT-6 Luna logo
o3 Mini vs GPT-6 LunaLanded Sep 2026

Same lab, same size, long tail

GLM 5.3 Prime logoGLM 5.1 logo
GLM 5.3 Prime vs GLM 5.1Same lab
GLM 5.3 Prime logoGLM 5 Turbo logo
GLM 5.3 Prime vs GLM 5 TurboSame lab
o3 Mini logoGPT-6 Sol Pro logo
o3 Mini vs GPT-6 Sol ProSame lab
o3 Mini logoGPT-6 Sol logo
o3 Mini vs GPT-6 SolSame lab
GLM 5.3 Prime logoGemini Pro 1.0 logo
GLM 5.3 Prime vs Gemini Pro 1.0Same size
GLM 5.3 Prime logoGemma 3 12B logo
GLM 5.3 Prime vs Gemma 3 12BSame size
GLM 5.3 Prime logoGemma 3 27B logo
GLM 5.3 Prime vs Gemma 3 27BNew provider
GLM 5.3 Prime logoGemma 3n 2B logo
GLM 5.3 Prime vs Gemma 3n 2BNew provider

Model pages

GLM 5.3 Prime logo
GLM 5.3 Prime16 outputs, specs and price
o3 Mini logo
o3 Mini59 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed