o3 vs Grok 2
Pricing, context window, and benchmark comparison · Last updated April 2026
Grok 2 is cheaper than o3 at $2.00/1M/1M vs $10.00/1M/1M input tokens — a 5.0x cost difference. o3 scores higher on quality benchmarks (ELO 1380). Choose Grok 2 for cost-sensitive workloads; choose o3 for maximum quality.
Which is cheaper: o3 or Grok 2?
Grok 2 is the cheaper option at $2.00/1M per 1M input tokens, compared to $10.00/1M for o3. That is a 5.0x cost difference on input tokens. Output pricing follows a similar pattern: o3 charges $40.00/1M/1M vs $10.00/1M/1M for Grok 2.
Which has better quality: o3 or Grok 2?
Based on LMSYS Chatbot Arena rankings, o3 achieves a higher ELO score (1380 vs 1290), suggesting stronger performance on open-ended tasks. o3 excels at highest reasoning benchmark scores of any model. Grok 2 is known for real-time x (twitter) data access.
Which should you choose: o3 or Grok 2?
- → Highest reasoning benchmark scores of any model
- → Better cost-efficiency than o1 at similar quality
- → Superior at agentic and multi-step tasks
- → Real-time X (Twitter) data access
- → Strong at current events and trending topics
- → Good humor and conversational ability
Frequently Asked Questions
Which is cheaper: o3 or Grok 2?
Grok 2 is cheaper at $2.00/1M per 1M input tokens, making it 5.0x more affordable.
Which has better quality: o3 or Grok 2?
o3 scores higher on the LMSYS Chatbot Arena with an ELO of 1380, suggesting better overall quality for most tasks.
Which has a larger context window: o3 or Grok 2?
o3 has a larger context window at 200K tokens.
Should I choose o3 or Grok 2?
Choose Grok 2 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 Grok 2 excels at research and creative-writing.
Is o3 or Grok 2 open source?
o3 is proprietary. Grok 2 is proprietary.