Model Comparison

GPT-4o vs GLM-4.5

GLM-4.5 significantly outperforms across most benchmarks. GLM-4.5 is 6.2x cheaper per token.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

GPT-4o outperforms in 0 benchmarks, while GLM-4.5 is better at 7 benchmarks (AIME 2024, GPQA, Humanity's Last Exam, MMLU-Pro, SWE-Bench Verified, TAU-bench Airline, TAU-bench Retail).

GLM-4.5 significantly outperforms across most benchmarks.

Fri May 08 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GLM-4.5 costs less

For input processing, GPT-4o ($2.50/1M tokens) is 6.3x more expensive than GLM-4.5 ($0.40/1M tokens).

For output processing, GPT-4o ($10.00/1M tokens) is 6.3x more expensive than GLM-4.5 ($1.60/1M tokens).

In conclusion, GPT-4o is more expensive than GLM-4.5.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Fri May 08 2026 • llm-stats.com
OpenAI
GPT-4o
Input tokens$2.50
Output tokens$10.00
Best providerAzure
Zhipu AI
GLM-4.5
Input tokens$0.40
Output tokens$1.60
Best providerDeepinfra
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GLM-4.5 accepts 131,072 input tokens compared to GPT-4o's 128,000 tokens. GLM-4.5 can generate longer responses up to 131,072 tokens, while GPT-4o is limited to 16,384 tokens.

OpenAI
GPT-4o
Input128,000 tokens
Output16,384 tokens
Zhipu AI
GLM-4.5
Input131,072 tokens
Output131,072 tokens
Fri May 08 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-4o supports multimodal inputs, whereas GLM-4.5 does not.

GPT-4o can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-4o

Text
Images
Audio
Video

GLM-4.5

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-4o is licensed under a proprietary license, while GLM-4.5 uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

GPT-4o

Proprietary

Closed source

GLM-4.5

MIT

Open weights

Release Timeline

When each model was launched

GPT-4o was released on 2024-08-06, while GLM-4.5 was released on 2025-07-28.

GLM-4.5 is 12 months newer than GPT-4o.

GPT-4o

Aug 6, 2024

1.8 years ago

GLM-4.5

Jul 28, 2025

9 months ago

11mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

GPT-4o is available from Azure, OpenAI. GLM-4.5 is available from DeepInfra, Fireworks, Novita.

GPT-4o

azure logo
Azure
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M
openai logo
OpenAI
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M

GLM-4.5

deepinfra logo
Deepinfra
Input Price:Input: $0.40/1MOutput Price:Output: $1.60/1M
fireworks logo
Fireworks
Input Price:Input: $0.55/1MOutput Price:Output: $2.19/1M
novita logo
Novita
Input Price:Input: $0.60/1MOutput Price:Output: $2.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Supports multimodal inputs
Zhipu AI
Larger context window (131,072 tokens)
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher AIME 2024 score (91.0% vs 13.1%)
Higher GPQA score (79.1% vs 70.1%)
Higher Humanity's Last Exam score (14.4% vs 5.3%)
Higher MMLU-Pro score (84.6% vs 74.7%)
Higher SWE-Bench Verified score (64.2% vs 33.2%)
Higher TAU-bench Airline score (60.4% vs 42.8%)
Higher TAU-bench Retail score (79.7% vs 60.3%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-4o
Zhipu AI
GLM-4.5

FAQ

Common questions about GPT-4o vs GLM-4.5.

Which is better, GPT-4o or GLM-4.5?

GLM-4.5 significantly outperforms across most benchmarks. GPT-4o is made by OpenAI and GLM-4.5 is made by Zhipu AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-4o compare to GLM-4.5 in benchmarks?

GPT-4o scores AI2D: 94.2%, DocVQA: 92.8%, ChartQA: 85.7%, MMLU: 85.7%, CharXiv-D: 85.3%. GLM-4.5 scores MATH-500: 98.2%, AIME 2024: 91.0%, MMLU-Pro: 84.6%, TAU-bench Retail: 79.7%, GPQA: 79.1%.

Is GPT-4o cheaper than GLM-4.5?

GLM-4.5 is 6.3x cheaper for input tokens. GPT-4o costs $2.50/M input and $10.00/M output via azure. GLM-4.5 costs $0.40/M input and $1.60/M output via deepinfra.

What are the context window sizes for GPT-4o and GLM-4.5?

GPT-4o supports 128K tokens and GLM-4.5 supports 131K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-4o and GLM-4.5?

Key differences include context window (128K vs 131K), input pricing ($2.50 vs $0.40/M), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-4o and GLM-4.5?

GPT-4o is developed by OpenAI and GLM-4.5 is developed by Zhipu AI.