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DeepSeek R1 vs GPT-5.3 Codex
A detailed comparison of DeepSeek R1 (DeepSeek) and GPT-5.3 Codex (OpenAI) across pricing, performance, and features.
Pricing Comparison
| Metric | DeepSeek R1 | GPT-5.3 Codex | Difference |
|---|---|---|---|
| Input / 1M tokens | $0.55 | $2.00 | +264% |
| Output / 1M tokens | $2.19 | $16.00 | +631% |
| Context window | 128K | 200K | — |
| Max output | 64K | 65.536K | — |
Benchmark Comparison
| Benchmark | DeepSeek R1 | GPT-5.3 Codex |
|---|---|---|
| MMLU-Pro | 84% | 90% |
| HumanEval | 92% | 96.5% |
| GPQA | 71.5% | 78% |
Capabilities
| Capability | DeepSeek R1 | GPT-5.3 Codex |
|---|---|---|
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✗ | ✓ |
| vision | ✗ | ✓ |
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
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
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.