token.app › Compare › GPT-4o vs GLM 5.2
GPT-4o vs GLM 5.2
GLM 5.2 leads on 3 of 3 shared benchmarks. GLM 5.2 is 11× cheaper per token on a blended 3:1 basis. GLM 5.2 accepts the larger context window (1.0M).
Head to head
Blended price uses a 3:1 input:output mix
| GPT-4o | GLM 5.2 | |
|---|---|---|
| Provider | OpenAI | Zhipu AI |
| Input $/1M | $2.50 | $0.252 |
| Output $/1M | $10.00 | $0.792 |
| Blended $/1M | $4.38 | $0.387 |
| Context window | 128K | 1.0M |
| Max output | 16K | 128K |
| Released | May 2024 | Jun 2026 |
| Licence | Proprietary | Open weights |
| GPQA Diamond | 47.9% | 91.9% |
| SWE-bench Verified | 31.0% | 78.7% |
| OTIS Mock AIME | 6.3% | 86.4% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose GPT-4o if…
- No clear advantage on the data we hold.
Choose GLM 5.2 if…
- Costs less per token — $0.387 vs $4.38 blended
- Higher GPQA Diamond (91.9% vs 47.9%)
- Higher SWE-bench Verified (78.7% vs 31.0%)
- Higher OTIS Mock AIME (86.4% vs 6.3%)
- Larger context window (1.0M)
- Open weights — self-hostable
- Newer model (released Jun 2026)
FAQ
Which is better, GPT-4o or GLM 5.2?
Across the 3 benchmarks both models have independently-run scores for, GPT-4o leads on 0 and GLM 5.2 leads on 3. Benchmarks are one input — price and context window are on this page too.
Is GPT-4o cheaper than GLM 5.2?
GLM 5.2 is cheaper: $0.387 versus $4.38 per million tokens blended at 3:1 input:output. Input alone: $2.50 vs $0.252. Output alone: $10.00 vs $0.792.
What context windows do GPT-4o and GLM 5.2 have?
GPT-4o: 128,000 tokens. GLM 5.2: 1,048,576 tokens.
Who makes GPT-4o and GLM 5.2?
GPT-4o is made by OpenAI. GLM 5.2 is made by Zhipu AI.