o3 vs Gemini 2.0 Flash
Pricing, context window, and benchmark comparison · Last updated April 2026
Gemini 2.0 Flash is cheaper than o3 at $0.10/1M/1M vs $10.00/1M/1M input tokens — a 100.0x cost difference. o3 scores higher on quality benchmarks (ELO 1380). Choose Gemini 2.0 Flash for cost-sensitive workloads; choose o3 for maximum quality.
Which is cheaper: o3 or Gemini 2.0 Flash?
Gemini 2.0 Flash is the cheaper option at $0.10/1M per 1M input tokens, compared to $10.00/1M for o3. That is a 100.0x cost difference on input tokens. Output pricing follows a similar pattern: o3 charges $40.00/1M/1M vs $0.40/1M/1M for Gemini 2.0 Flash.
Which has better quality: o3 or Gemini 2.0 Flash?
Based on LMSYS Chatbot Arena rankings, o3 achieves a higher ELO score (1380 vs 1330), suggesting stronger performance on open-ended tasks. o3 excels at highest reasoning benchmark scores of any model. Gemini 2.0 Flash is known for latest-gen quality with flash-tier pricing.
Which should you choose: o3 or Gemini 2.0 Flash?
- → Highest reasoning benchmark scores of any model
- → Better cost-efficiency than o1 at similar quality
- → Superior at agentic and multi-step tasks
- → Latest-gen quality with Flash-tier pricing
- → Native tool use and agentic capabilities
- → 1M context window
Frequently Asked Questions
Which is cheaper: o3 or Gemini 2.0 Flash?
Gemini 2.0 Flash is cheaper at $0.10/1M per 1M input tokens, making it 100.0x more affordable.
Which has better quality: o3 or Gemini 2.0 Flash?
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 Gemini 2.0 Flash?
Gemini 2.0 Flash has a larger context window at 1000K tokens.
Should I choose o3 or Gemini 2.0 Flash?
Choose Gemini 2.0 Flash 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 Gemini 2.0 Flash excels at fast-response and function-calling.
Is o3 or Gemini 2.0 Flash open source?
o3 is proprietary. Gemini 2.0 Flash is proprietary.