GLM 4.5 vs GPT-5 Pro (Comparative Analysis)
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Overview
GLM 4.5 was released 2 months before GPT-5 Pro.
 GLM 4.5 |  GPT-5 Pro | |
|---|---|---|
Model Provider The organization behind this AI's development | Z.AI | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 131.1K tokens | 400K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 98.3K tokens | 128K tokens |
Release Date When this model first became publicly available | July 25, 2025 1 year ago July 25th, 2025 | October 6, 2025 9 months ago October 6th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | December 31, 2024 | September 30, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GLM 4.5 | GPT-5 Pro | |
|---|---|---|
Input Types Supported input formats | 📝Text | 🖼️Image📝Text📁File |
Reasoning Controls Defaults and configurable reasoning effort | Optional | Always enabledEffort: HighDefault: High |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Other | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation |
Open Source Model availability | Available on HuggingFace → | Proprietary |
Pricing
GLM 4.5 is roughly 0.04x less expensive compared to GPT-5 Pro for input tokens and roughly 0.02x less expensive for output tokens.
| GLM 4.5 | GPT-5 Pro | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.60 per million tokens | $15.00 per million tokens |
Output Token Cost Cost per million output tokens | $2.20 per million tokens | $120.00 per million tokens |
Web Search Cost Additional cost for each web search operation | Not specified | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.11 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between GLM 4.5 and GPT-5 Pro.
| GLM 4.5 | GPT-5 Pro | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,227 Elo (#38 in 3D (59.7% win rate)) | Benchmark not available. |
At a Glance
Quick overview of what makes GLM 4.5 and GPT-5 Pro unique.
GLM 4.5 by Z.AI can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 131.1K token context window. Reasonably priced at $0.60/M input and $2.20/M output tokens. Released July 25th, 2025.GPT-5 Pro by OpenAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 400K token context window. Premium pricing at $15.00/M input and $120.00/M output tokens. Includes built-in content moderation for safer outputs. Released October 6th, 2025.Explore More Comparisons
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