OpenAI: GPT-6.1 Sol vs Z.ai: GLM 5.3 Flash
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-01.
| OpenAI: GPT-6.1 Sol | Z.ai: GLM 5.3 Flash | |
|---|---|---|
| Vendor | openai | z-ai |
| Quality Score | 100 | 100 |
| Benchmark Score | 89.2 | 70.6 |
| Input Price | $2.00/M | $0.15/M |
| Output Price | $10.00/M | $0.50/M |
| Context Window | 1,050,000 | 1,048,576 |
| Max Output | 128,000 | 943,717 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 85.5 | 69.0 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GLM 5.3 Flash costs $0.28 and GPT-6.1 Sol costs $4.50, so GLM 5.3 Flash is about 16.4 times cheaper for the same work.
Both take in a similar amount of text: 1,050,000 and 1,048,576 tokens, about 1,575 and 1,573 pages.
Only GLM 5.3 Flash offers video input.
On our blended benchmark score GPT-6.1 Sol leads 89.2 to 70.6.
Across the 20 tasks where they differ, GPT-6.1 Sol scores higher on 13 (SQL Generation, Code Review, Code Refactoring and others), GLM 5.3 Flash on 7 (Code Completion, Code Documentation, Regex Writing and others).
GPT-6.1 Sol was released in September 2026 and GLM 5.3 Flash in August 2026.
Pick GPT-6.1 Sol if you need benchmark performance; pick GLM 5.3 Flash if you need lower cost or video input.
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 | OpenAI: GPT-6.1 Sol | Z.ai: GLM 5.3 Flash |
|---|---|---|
| SQL Generation | 143 | 142 |
| Code Review | 148 | 145 |
| Code Completion | 119 | 133 |
| Code Refactoring | 149 | 147 |
| Bug Fixing | 152 | 149 |
| Unit Test Generation | 134 | 132 |
| Code Documentation | 137 | 138 |
| Regex Writing | 126 | 126 |
| CI/CD Pipelines | 130 | 128 |
| Frontend Component Design | 132 | 130 |
| Data Analysis | 136 | 134 |
| CSV / Spreadsheet Cleanup | 136 | 136 |
| ETL Scripting | 140 | 137 |
| JSON Extraction | 121 | 131 |
| Bulk Data Labeling | 118 | 129 |
| OCR / Document Parsing | 135 | 134 |
| Table Extraction from PDFs | 135 | 134 |
| Long-Document Summarization | 150 | 149 |
| Short-Form Summarization | 117 | 127 |
| Blog Post Writing | 131 | 130 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →