Gemini 3 Flash vs o3-mini
Pricing, context window, and benchmark comparison · Last updated June 2026
Gemini 3 Flash is cheaper than o3-mini at $0.50/1M vs $1.10/1M input tokens — a 2.2x cost difference. Gemini 3 Flash scores higher on quality benchmarks (ELO 1370). Choose Gemini 3 Flash for cost-sensitive workloads; both are strong choices depending on your budget.
Which is cheaper: Gemini 3 Flash or o3-mini?
Gemini 3 Flash is the cheaper option at $0.50/1M per 1M input tokens, compared to $1.10/1M for o3-mini. That is a 2.2x cost difference on input tokens. Output pricing follows a similar pattern: Gemini 3 Flash charges $3.00/1M vs $4.40/1M for o3-mini.
Which has better quality: Gemini 3 Flash or o3-mini?
Based on LMSYS Chatbot Arena rankings, Gemini 3 Flash achieves a higher ELO score (1370 vs 1340), suggesting stronger performance on open-ended tasks. Gemini 3 Flash excels at gemini 3-generation quality at flash pricing. o3-mini is known for strong reasoning at a low price point.
Which should you choose: Gemini 3 Flash or o3-mini?
- → Gemini 3-generation quality at Flash pricing
- → 1M context window
- → Strong multimodal reasoning
- → Strong reasoning at a low price point
- → 200K context window
- → Three effort levels (low/medium/high) for cost control
Frequently Asked Questions
Which is cheaper: Gemini 3 Flash or o3-mini?
Gemini 3 Flash is cheaper at $0.50/1M per 1M input tokens, making it 2.2x more affordable.
Which has better quality: Gemini 3 Flash or o3-mini?
Gemini 3 Flash scores higher on the LMSYS Chatbot Arena with an ELO of 1370, suggesting better overall quality for most tasks.
Which has a larger context window: Gemini 3 Flash or o3-mini?
Gemini 3 Flash has a larger context window at 1000K tokens.
Should I choose Gemini 3 Flash or o3-mini?
Choose Gemini 3 Flash if cost is the priority. Choose Gemini 3 Flash if benchmark quality is most important. Consider your specific use case: Gemini 3 Flash is best for fast-response and function-calling, while o3-mini excels at reasoning and math.
Is Gemini 3 Flash or o3-mini open source?
Gemini 3 Flash is proprietary. o3-mini is proprietary.