Compare · ModelsLive · 2 picked · head to head
GLM 5.3 Flash vs GPT-5 Pro
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GLM 5.3 Flash wins on 1/2 benchmarks
GLM 5.3 Flash wins 1 of 2 shared benchmarks.
Category leads
math·GPT-5 Pro
Hype vs Reality
Attention vs performance
GLM 5.3 Flash
#169 by perf·#3 by attention
GPT-5 Pro
#173 by perf·#4 by attention
Best value
GLM 5.3 Flash
217.0x better value than GPT-5 Pro
GLM 5.3 Flash
135.7 pts/$
$0.33/M
GPT-5 Pro
0.6 pts/$
$67.50/M
Vendor risk
Who is behind the model
z-ai
private · undisclosed
OpenAI
$840.0B·Tier 1
Head to head
2 benchmarks · 2 models
GLM 5.3 FlashGPT-5 Pro
FrontierMath-Tier-4-v2-Private
GPT-5 Pro leads by +2.4
GLM 5.3 Flash
17.1
GPT-5 Pro
19.5
FrontierMath-Tiers-1-3-v2-Private
GLM 5.3 Flash
55.8
GPT-5 Pro
55.8
Full benchmark table
| Benchmark | GLM 5.3 Flash | GPT-5 Pro |
|---|---|---|
FrontierMath-Tier-4-v2-Private | 17.1 | 19.5 |
FrontierMath-Tiers-1-3-v2-Private | 55.8 | 55.8 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $0.15 | $0.50 | 1.0M tokens (~524 books) | $2.38 | |
| $15.00 | $120.00 | 400K tokens (~200 books) | $412.50 |