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GPT-5.3 Codex vs GPT-5
A detailed comparison of GPT-5.3 Codex (OpenAI) and GPT-5 (OpenAI) across pricing, performance, and features.
Pricing Comparison
| Metric | GPT-5.3 Codex | GPT-5 | Difference |
|---|---|---|---|
| Input / 1M tokens | $2.00 | $1.25 | -38% |
| Output / 1M tokens | $16.00 | $10.00 | -38% |
| Context window | 200K | 128K | — |
| Max output | 65.536K | 16.384K | — |
Benchmark Comparison
| Benchmark | GPT-5.3 Codex | GPT-5 |
|---|---|---|
| MMLU-Pro | 90% | 88.5% |
| HumanEval | 96.5% | 95% |
| GPQA | 78% | 73.5% |
Capabilities
| Capability | GPT-5.3 Codex | GPT-5 |
|---|---|---|
| audio | ✗ | ✓ |
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
GPT-5.3 Codex Strengths
- ✓Best coding model from OpenAI
- ✓Large output window (65K tokens)
- ✓Strong reasoning for complex tasks
GPT-5.3 Codex Weaknesses
- ✗API access not yet available
- ✗Premium pricing
GPT-5 Strengths
- ✓Strong all-around performance
- ✓Good price for flagship tier
- ✓Multimodal including audio
GPT-5 Weaknesses
- ✗128K context vs 200K+ for newer models
- ✗Codex variants better for pure coding
Quick Verdict
Best value: GPT-5 is the more affordable option at $1.25/$10 per 1M tokens.
Higher benchmarks: GPT-5.3 Codex scores higher on average across available benchmarks (88.2% avg).
Larger context: GPT-5.3 Codex supports 200K tokens.
Choose GPT-5 if cost matters most. Choose GPT-5.3 Codex if you need the best possible quality for complex tasks.