o3 vs DeepSeek V3.2 (Reasoner)
Pricing, context window, and benchmark comparison · Last updated April 2026
DeepSeek V3.2 (Reasoner) is cheaper than o3 at $0.28/1M/1M vs $2.00/1M/1M input tokens — a 7.1x cost difference. o3 scores higher on quality benchmarks (ELO 1395). Choose DeepSeek V3.2 (Reasoner) for cost-sensitive workloads; choose o3 for maximum quality.
Which is cheaper: o3 or DeepSeek V3.2 (Reasoner)?
DeepSeek V3.2 (Reasoner) is the cheaper option at $0.28/1M per 1M input tokens, compared to $2.00/1M for o3. That is a 7.1x cost difference on input tokens. Output pricing follows a similar pattern: o3 charges $8.00/1M/1M vs $0.42/1M/1M for DeepSeek V3.2 (Reasoner).
Which has better quality: o3 or DeepSeek V3.2 (Reasoner)?
Based on LMSYS Chatbot Arena rankings, o3 achieves a higher ELO score (1395 vs 1385), suggesting stronger performance on open-ended tasks. o3 excels at top-tier reasoning on math, science, and agentic tasks. DeepSeek V3.2 (Reasoner) is known for o-series-class reasoning at a fraction of the price.
Which should you choose: o3 or DeepSeek V3.2 (Reasoner)?
- → Top-tier reasoning on math, science, and agentic tasks
- → 87% cheaper than original o1 at the same capability tier
- → 200K context window
- → o-series-class reasoning at a fraction of the price
- → Up to 64K output tokens for long chain-of-thought
- → Open weights
Frequently Asked Questions
Which is cheaper: o3 or DeepSeek V3.2 (Reasoner)?
DeepSeek V3.2 (Reasoner) is cheaper at $0.28/1M per 1M input tokens, making it 7.1x more affordable.
Which has better quality: o3 or DeepSeek V3.2 (Reasoner)?
o3 scores higher on the LMSYS Chatbot Arena with an ELO of 1395, suggesting better overall quality for most tasks.
Which has a larger context window: o3 or DeepSeek V3.2 (Reasoner)?
o3 has a larger context window at 200K tokens.
Should I choose o3 or DeepSeek V3.2 (Reasoner)?
Choose DeepSeek V3.2 (Reasoner) if cost is the priority. Choose o3 if benchmark quality is most important. Consider your specific use case: o3 is best for reasoning and math, while DeepSeek V3.2 (Reasoner) excels at reasoning and math.
Is o3 or DeepSeek V3.2 (Reasoner) open source?
o3 is proprietary. DeepSeek V3.2 (Reasoner) is open source.