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o3 vs Gemini 2.5 Flash

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OpenAI · 200k context | Google · 1M context

Pricing Comparison

Metric	o3	Gemini 2.5 Flash
Input / 1M tokens	$0.4	$0.3
Output / 1M tokens	$1.6	$2.5
Cached input / 1M	—	$0.075
Context window	200k	1M
Provider	OpenAI	Google

Cost Calculator

Input tokens

Output tokens

Requests/day

💰 o3 saves $105.00/month (23% cheaper)

Oo3CHEAPER

Per request$0.001200

Daily$12.00

Monthly$360.00

Yearly$4,380.00

GGemini 2.5 Flash

Per request$0.001550

Daily$15.50

Monthly$465.00

Yearly$5,657.50

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Choose o3 when…

✓ Cheaper for generation-heavy workloads (lower output cost)
✓ Optimized for: Complex reasoning

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Choose Gemini 2.5 Flash when…

✓ Cheaper for RAG & document retrieval (lower input cost)
✓ 25% cheaper per input token
✓ Larger context window (1M vs 200k) — better for long documents
✓ Supports prompt caching — save up to 90% on repeated prompts
✓ Optimized for: Speed & efficiency

Related Comparisons

o3 vs GPT-5 o3 vs GPT-5 Mini o3 vs GPT-4.1 o3 vs GPT-4.1 Mini Gemini 2.5 Flash vs GPT-5 Gemini 2.5 Flash vs GPT-5 Mini