Z.ai: GLM 5V Turbo vs OpenAI: GPT-5.3-Codex
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| Z.ai: GLM 5V Turbo | OpenAI: GPT-5.3-Codex | |
|---|---|---|
| Vendor | z-ai | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | 56.8 | 73.4 |
| Input Price | $1.20/M | $1.75/M |
| Output Price | $4.00/M | $14.00/M |
| Context Window | 202,752 | 400,000 |
| Max Output | 131,072 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 56.9 | 73.0 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GLM 5V Turbo costs $2.20 and GPT-5.3-Codex costs $5.25, so GLM 5V Turbo is about 2.4 times cheaper for the same work.
GPT-5.3-Codex reads up to 400,000 tokens at once, roughly 600 pages of text, against about 304 pages for GLM 5V Turbo.
Only GLM 5V Turbo offers video input.
On our blended benchmark score GPT-5.3-Codex leads 73.4 to 56.8.
Across the 20 tasks where they differ, GLM 5V Turbo scores higher on 4 (Regex Writing, JSON Extraction, Bulk Data Labeling and others), GPT-5.3-Codex on 16 (SQL Generation, Code Review, Code Completion and others).
GLM 5V Turbo was released in April 2026 and GPT-5.3-Codex in February 2026.
Pick GLM 5V Turbo if you need lower cost or video input; pick GPT-5.3-Codex if you need long documents, benchmark performance or the stronger all-round task scores.
Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.
Who wins by task?
| Task | Z.ai: GLM 5V Turbo | OpenAI: GPT-5.3-Codex |
|---|---|---|
| SQL Generation | 136 | 141 |
| Code Review | 134 | 145 |
| Code Completion | 116 | 118 |
| Code Refactoring | 133 | 147 |
| Bug Fixing | 138 | 149 |
| Unit Test Generation | 126 | 132 |
| Code Documentation | 128 | 135 |
| Regex Writing | 124 | 124 |
| CI/CD Pipelines | 122 | 128 |
| Frontend Component Design | 128 | 130 |
| Data Analysis | 132 | 134 |
| CSV / Spreadsheet Cleanup | 127 | 135 |
| ETL Scripting | 128 | 138 |
| JSON Extraction | 123 | 120 |
| Bulk Data Labeling | 120 | 117 |
| OCR / Document Parsing | 129 | 134 |
| Table Extraction from PDFs | 129 | 134 |
| Long-Document Summarization | 134 | 148 |
| Short-Form Summarization | 117 | 116 |
| Blog Post Writing | 124 | 129 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →