API cost decision in 10 seconds

Gemini 2.5 Pro vs o3 Mini

Pick o3 Mini for lower cost; pick Gemini 2.5 Pro only if the larger context window matters more.

Page updated: 2026-05-26T15:08:08Z Data confirmed: 2026-05-26T20:08:05Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick o3 Mini for lower cost; pick Gemini 2.5 Pro only if the larger context window matters more.

On the standard 1M input plus 500K output workload, o3 Mini is estimated at $3.3 vs $6.25 for Gemini 2.5 Pro, saving $2.95 (47.2% lower).

Cost-first picko3 Mini

Context-first pickGemini 2.5 Pro

Sample savings$2.9547.2%

10x traffic gap$29.5

Gemini 2.5 Pro has more context, but o3 Mini saves $2.95 on the standard workload. At 10x that traffic, the same price gap is about $29.5. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

o3 Mini stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Gemini 2.5 Pro	o3 Mini
Input-heavy / RAG	5M input + 500K output	o3 Mini	$11.25	$7.7
Balanced workload	1M input + 1M output	o3 Mini	$11.25	$5.5
Output-heavy chatbot	1M input + 5M output	o3 Mini	$51.25	$23.1

Cheaper input o3 Mini $1.25 vs $1.1 / 1M

o3 Mini is $0.15 cheaper per 1M input tokens (12% lower; 1.14x difference).

Cheaper output o3 Mini $10 vs $4.4 / 1M

o3 Mini is $5.6 cheaper per 1M output tokens (56% lower; 2.27x difference).

Larger context Gemini 2.5 Pro 1.05M vs 200K

Gemini 2.5 Pro has 848.58K more context (5.24x larger).

Sample workload o3 Mini $6.25 vs $3.3

o3 Mini is $2.95 cheaper on the standard workload (47.2% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Gemini 2.5 Pro Calculating… Estimated API cost

o3 Mini Calculating… Estimated API cost

Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

o3 Mini has the lower input price; o3 Mini has the lower output price; Gemini 2.5 Pro offers the larger context window. For the 1M input plus 500K output sample, o3 Mini is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $6.25 for Gemini 2.5 Pro and $3.3 for o3 Mini.

Best Fit

Choose Gemini 2.5 Pro when you care most about larger context window.

Choose o3 Mini when you care most about lower input-token price, and lower output-token price.

Decision Notes

On the standard 1M input plus 500K output workload, o3 Mini is estimated at $3.3 vs $6.25 for Gemini 2.5 Pro, saving $2.95 (47.2% lower).
o3 Mini is $2.95 cheaper on the standard workload (47.2% lower).
o3 Mini is $0.15 cheaper per 1M input tokens (12% lower; 1.14x difference).
o3 Mini is $5.6 cheaper per 1M output tokens (56% lower; 2.27x difference).
Gemini 2.5 Pro has 848.58K more context (5.24x larger).

Head-to-Head Specs

Feature	Gemini 2.5 Pro (Google)	o3 Mini (OpenAI)
Input Price prompt tokens per 1M	$1.25	$1.1
Completion Price per 1M tokens	$10	$4.4
Sample Workload Cost 1M input + 500K output	$6.25	$3.3
Context Window	1.05M	200K
Release Date	2025-06-17	2025-01-31
Popularity	#55	#120

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	o3 Mini	On the standard 1M input plus 500K output workload, o3 Mini is estimated at $3.3 vs $6.25 for Gemini 2.5 Pro, saving $2.95 (47.2% lower).
High-volume input processing	o3 Mini	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	o3 Mini	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Gemini 2.5 Pro	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

Gemma 4 31B (free) can replace Gemini 2.5 Pro when lower sample workload cost matters most: $0.
Gemma 4 26B A4B (free) can replace Gemini 2.5 Pro when lower sample workload cost matters most: $0.
Lyria 3 Clip Preview can replace Gemini 2.5 Pro when lower sample workload cost matters most: $0.
Lyria 3 Pro Preview can replace Gemini 2.5 Pro when lower sample workload cost matters most: $0.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.
Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
Owl Alpha offers 1.05M context with $0 sample workload cost.

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Cheaper alternatives

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Larger context alternatives

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Provider catalogs

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Google catalog

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OpenAI catalog

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Open OpenAI models

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