OpenAI: GPT-5.4 Nano vs OpenAI: GPT-5.3-Codex
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| OpenAI: GPT-5.4 Nano | OpenAI: GPT-5.3-Codex | |
|---|---|---|
| Vendor | openai | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | 68.1 | 73.4 |
| Input Price | $0.20/M | $1.75/M |
| Output Price | $1.25/M | $14.00/M |
| Context Window | 400,000 | 400,000 |
| Max Output | 128,000 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 63.1 | 73.0 |
| ai_index_agentic | 45.4 | - |
| ai_index_coding | 92.5 | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GPT-5.4 Nano costs $0.51 and GPT-5.3-Codex costs $5.25, so GPT-5.4 Nano is about 10.2 times cheaper for the same work.
Both read up to 400,000 tokens at once, roughly 600 pages of text.
On our blended benchmark score GPT-5.3-Codex leads 73.4 to 68.1.
Across the 20 tasks where they differ, GPT-5.4 Nano scores higher on 20 (SQL Generation, Code Review, Code Completion and others).
GPT-5.4 Nano was released in March 2026 and GPT-5.3-Codex in February 2026.
Pick GPT-5.4 Nano if you need lower cost or the stronger all-round task scores; pick GPT-5.3-Codex if you need benchmark performance.
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-5.4 Nano | OpenAI: GPT-5.3-Codex |
|---|---|---|
| SQL Generation | 163 | 141 |
| Code Review | 158 | 145 |
| Code Completion | 133 | 118 |
| Code Refactoring | 157 | 147 |
| Bug Fixing | 168 | 149 |
| Unit Test Generation | 148 | 132 |
| Code Documentation | 140 | 135 |
| Regex Writing | 132 | 124 |
| CI/CD Pipelines | 139 | 128 |
| Frontend Component Design | 141 | 130 |
| Data Analysis | 159 | 134 |
| CSV / Spreadsheet Cleanup | 151 | 135 |
| ETL Scripting | 148 | 138 |
| JSON Extraction | 146 | 120 |
| Bulk Data Labeling | 134 | 117 |
| OCR / Document Parsing | 144 | 134 |
| Table Extraction from PDFs | 144 | 134 |
| Long-Document Summarization | 154 | 148 |
| Short-Form Summarization | 130 | 116 |
| Blog Post Writing | 135 | 129 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →