o1 vs Gemini 1.5 Flash
Pricing, context window, and benchmark comparison · Last updated April 2026
Gemini 1.5 Flash is cheaper than o1 at $0.07/1M/1M vs $15.00/1M/1M input tokens — a 200.0x cost difference. o1 scores higher on quality benchmarks (ELO 1350). Choose Gemini 1.5 Flash for cost-sensitive workloads; choose o1 for maximum quality.
Which is cheaper: o1 or Gemini 1.5 Flash?
Gemini 1.5 Flash is the cheaper option at $0.07/1M per 1M input tokens, compared to $15.00/1M for o1. That is a 200.0x cost difference on input tokens. Output pricing follows a similar pattern: o1 charges $60.00/1M/1M vs $0.30/1M/1M for Gemini 1.5 Flash.
Which has better quality: o1 or Gemini 1.5 Flash?
Based on LMSYS Chatbot Arena rankings, o1 achieves a higher ELO score (1350 vs 1211), suggesting stronger performance on open-ended tasks. o1 excels at best-in-class reasoning on complex problems. Gemini 1.5 Flash is known for one of the cheapest high-quality models available.
Which should you choose: o1 or Gemini 1.5 Flash?
- → Best-in-class reasoning on complex problems
- → Exceptional at math, science, and formal logic
- → Large 200K context window
- → One of the cheapest high-quality models available
- → 1M token context window
- → Very fast inference
Frequently Asked Questions
Which is cheaper: o1 or Gemini 1.5 Flash?
Gemini 1.5 Flash is cheaper at $0.07/1M per 1M input tokens, making it 200.0x more affordable.
Which has better quality: o1 or Gemini 1.5 Flash?
o1 scores higher on the LMSYS Chatbot Arena with an ELO of 1350, suggesting better overall quality for most tasks.
Which has a larger context window: o1 or Gemini 1.5 Flash?
Gemini 1.5 Flash has a larger context window at 1000K tokens.
Should I choose o1 or Gemini 1.5 Flash?
Choose Gemini 1.5 Flash if cost is the priority. Choose o1 if benchmark quality is most important. Consider your specific use case: o1 is best for reasoning and math, while Gemini 1.5 Flash excels at low-cost and fast-response.
Is o1 or Gemini 1.5 Flash open source?
o1 is proprietary. Gemini 1.5 Flash is proprietary.