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GPT-5.3 Codex vs DeepSeek R1
A detailed comparison of GPT-5.3 Codex (OpenAI) and DeepSeek R1 (DeepSeek) across pricing, performance, and features.
Pricing Comparison
| Metric | GPT-5.3 Codex | DeepSeek R1 | Difference |
|---|---|---|---|
| Input / 1M tokens | $2.00 | $0.55 | -73% |
| Output / 1M tokens | $16.00 | $2.19 | -86% |
| Context window | 200K | 128K | — |
| Max output | 65.536K | 64K | — |
Benchmark Comparison
| Benchmark | GPT-5.3 Codex | DeepSeek R1 |
|---|---|---|
| MMLU-Pro | 90% | 84% |
| HumanEval | 96.5% | 92% |
| GPQA | 78% | 71.5% |
Capabilities
| Capability | GPT-5.3 Codex | DeepSeek R1 |
|---|---|---|
| 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
DeepSeek R1 Strengths
- ✓Cheapest reasoning model available
- ✓Strong math and science performance
- ✓Open-source with off-peak discounts
DeepSeek R1 Weaknesses
- ✗Slower than non-reasoning models
- ✗No vision or tool-use
- ✗China-based — availability concerns
Quick Verdict
Best value: DeepSeek R1 is the more affordable option at $0.55/$2.19 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 DeepSeek R1 if cost matters most. Choose GPT-5.3 Codex if you need the best possible quality for complex tasks.