OpenAI: GPT-5.3-Codex vs Qwen: Qwen3.5 Plus 2026-02-15
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| OpenAI: GPT-5.3-Codex | Qwen: Qwen3.5 Plus 2026-02-15 | |
|---|---|---|
| Vendor | openai | qwen |
| Quality Score | 100 | 100 |
| Benchmark Score | 73.4 | - |
| Input Price | $1.75/M | $0.26/M |
| Output Price | $14.00/M | $1.56/M |
| Context Window | 400,000 | 1,000,000 |
| Max Output | 128,000 | 65,536 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 73.0 | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Qwen3.5 Plus 2026-02-15 costs $0.65 and GPT-5.3-Codex costs $5.25, so Qwen3.5 Plus 2026-02-15 is about 8.1 times cheaper for the same work.
Qwen3.5 Plus 2026-02-15 reads up to 1,000,000 tokens at once, roughly 1,500 pages of text, against about 600 pages for GPT-5.3-Codex.
Only Qwen3.5 Plus 2026-02-15 offers video input.
Across the 20 tasks where they differ, GPT-5.3-Codex scores higher on 16 (SQL Generation, Code Review, Code Refactoring and others), Qwen3.5 Plus 2026-02-15 on 4 (Code Completion, JSON Extraction, Bulk Data Labeling and others).
Pick GPT-5.3-Codex if you need the stronger all-round task scores; pick Qwen3.5 Plus 2026-02-15 if you need lower cost, long documents 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-5.3-Codex | Qwen: Qwen3.5 Plus 2026-02-15 |
|---|---|---|
| SQL Generation | 141 | 133 |
| Code Review | 145 | 132 |
| Code Completion | 118 | 131 |
| Code Refactoring | 147 | 136 |
| Bug Fixing | 149 | 136 |
| Unit Test Generation | 132 | 124 |
| Code Documentation | 135 | 131 |
| Regex Writing | 124 | 119 |
| CI/CD Pipelines | 128 | 120 |
| Frontend Component Design | 130 | 122 |
| Data Analysis | 134 | 124 |
| CSV / Spreadsheet Cleanup | 135 | 133 |
| ETL Scripting | 138 | 128 |
| JSON Extraction | 120 | 131 |
| Bulk Data Labeling | 117 | 129 |
| OCR / Document Parsing | 134 | 131 |
| Table Extraction from PDFs | 134 | 131 |
| Long-Document Summarization | 148 | 137 |
| Short-Form Summarization | 116 | 123 |
| Blog Post Writing | 129 | 121 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →