o3-mini vs Gemini 2.5 Flash
Pricing, context window, and benchmark comparison · Last updated June 2026
Gemini 2.5 Flash is cheaper than o3-mini at $0.30/1M vs $1.10/1M input tokens — a 3.7x cost difference. Both models have comparable benchmark scores. Choose Gemini 2.5 Flash for cost-sensitive workloads; both are strong choices depending on your budget.
Which is cheaper: o3-mini or Gemini 2.5 Flash?
Gemini 2.5 Flash is the cheaper option at $0.30/1M per 1M input tokens, compared to $1.10/1M for o3-mini. That is a 3.7x cost difference on input tokens. Output pricing follows a similar pattern: o3-mini charges $4.40/1M vs $2.50/1M for Gemini 2.5 Flash.
Which has better quality: o3-mini or Gemini 2.5 Flash?
Based on LMSYS Chatbot Arena rankings, o3-mini achieves a higher ELO score (1340 vs 1340), suggesting stronger performance on open-ended tasks. o3-mini excels at strong reasoning at a low price point. Gemini 2.5 Flash is known for excellent price-performance at flash tier.
Which should you choose: o3-mini or Gemini 2.5 Flash?
- → Strong reasoning at a low price point
- → 200K context window
- → Three effort levels (low/medium/high) for cost control
- → Excellent price-performance at Flash tier
- → 1M token context window
- → Native multimodal
Frequently Asked Questions
Which is cheaper: o3-mini or Gemini 2.5 Flash?
Gemini 2.5 Flash is cheaper at $0.30/1M per 1M input tokens, making it 3.7x more affordable.
Which has better quality: o3-mini or Gemini 2.5 Flash?
Both models have similar quality rankings on available benchmarks.
Which has a larger context window: o3-mini or Gemini 2.5 Flash?
Gemini 2.5 Flash has a larger context window at 1000K tokens.
Should I choose o3-mini or Gemini 2.5 Flash?
Choose Gemini 2.5 Flash if cost is the priority. Consider your specific use case: o3-mini is best for reasoning and math, while Gemini 2.5 Flash excels at fast-response and low-cost.
Is o3-mini or Gemini 2.5 Flash open source?
o3-mini is proprietary. Gemini 2.5 Flash is proprietary.