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o3 vs Gemini 3 Flash

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OpenAI · 200k context | Google · 1M context

Pricing Comparison

Metric	o3	Gemini 3 Flash
Input / 1M tokens	$0.4	$0.5
Output / 1M tokens	$1.6	$2
Cached input / 1M	—	$0.125
Context window	200k	1M
Provider	OpenAI	Google

Cost Calculator

Input tokens

Output tokens

Requests/day

💰 o3 saves $90.00/month (20% cheaper)

Oo3CHEAPER

Per request$0.001200

Daily$12.00

Monthly$360.00

Yearly$4,380.00

GGemini 3 Flash

Per request$0.001500

Daily$15.00

Monthly$450.00

Yearly$5,475.00

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Choose o3 when…

✓ Cheaper for RAG & document retrieval (lower input cost)
✓ 20% cheaper per input token
✓ Cheaper for generation-heavy workloads (lower output cost)
✓ Optimized for: Complex reasoning

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Choose Gemini 3 Flash when…

✓ Larger context window (1M vs 200k) — better for long documents
✓ Supports prompt caching — save up to 90% on repeated prompts
✓ Optimized for: Real-time 1M context apps

Related Comparisons

o3 vs GPT-5 o3 vs GPT-5 Mini o3 vs GPT-4.1 o3 vs GPT-4.1 Mini Gemini 3 Flash vs GPT-5 Gemini 3 Flash vs GPT-5 Mini