GLM 5.2 vs GPT-5.1-Codex (Comparative Analysis)
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Comparative Analysis: GLM 5.2 vs. GPT-5.1-Codex
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Overview
GPT-5.1-Codex was released 7 months before GLM 5.2.
 GLM 5.2 |  GPT-5.1-Codex | |
|---|---|---|
Model Provider The organization behind this AI's development | Z.AI | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 400K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 131.1K tokens | 128K tokens |
Release Date When this model first became publicly available | June 16, 2026 1 month ago June 16th, 2026 | November 13, 2025 8 months ago November 13th, 2025 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GLM 5.2 | GPT-5.1-Codex | |
|---|---|---|
Input Types Supported input formats | 📝Text | 📝Text🖼️Image |
Reasoning Controls Defaults and configurable reasoning effort | Enabled by defaultEffort: Extra High, HighDefault: High | Always enabledEffort: High, Medium, LowDefault: Medium |
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 ModeContent Moderation |
Open Source Model availability | Available on HuggingFace → | Proprietary |
Pricing
GLM 5.2 is roughly 0.5x less expensive compared to GPT-5.1-Codex for input tokens and roughly 0.2x less expensive for output tokens.
| GLM 5.2 | GPT-5.1-Codex | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.67 per million tokens | $1.25 per million tokens |
Output Token Cost Cost per million output tokens | $2.10 per million tokens | $10.00 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 | $0.12 per million tokens | $0.13 per million tokens |
Benchmarks
Compare relevant benchmarks between GLM 5.2 and GPT-5.1-Codex.
| GLM 5.2 | GPT-5.1-Codex | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 51.1 (Artificial Analysis index; higher is better) | Benchmark not available. |
Coding Index Programming performance across independent evaluations | 68.8 (Artificial Analysis index; higher is better) | Benchmark not available. |
Agentic Index Ability to complete multi-step agentic tasks | 43.1 (Artificial Analysis index; higher is better) | Benchmark not available. |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,367 Elo (#3 in 3D (59.9% win rate)) | 1,203 Elo (#47 in Data Viz (50.7% win rate)) |
At a Glance
Quick overview of what makes GLM 5.2 and GPT-5.1-Codex unique.
GLM 5.2 by Z.AI can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Reasonably priced at $0.67/M input and $2.10/M output tokens. Released June 16th, 2026.GPT-5.1-Codex 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. Reasonably priced at $1.25/M input and $10.00/M output tokens. Released November 13th, 2025.Explore More Comparisons
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Compare GPT-5.1-Codex with:
🚀Programming
Best models for coding and development
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Models optimized for creative writing
📢Marketing
Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
Scientific research and analysis
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Multilingual translation tasks