API cost decision in 10 seconds

o3 Mini vs Nano Banana Pro (Gemini 3 Pro Image Preview)

Pick o3 Mini when budget and context both matter.

Page updated:  Data confirmed:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick o3 Mini when budget and context both matter.

On the standard 1M input plus 500K output workload, o3 Mini is estimated at $3.3 vs $8 for Nano Banana Pro (Gemini 3 Pro Image Preview), saving $4.7 (58.7% lower).

Cost-first picko3 Mini
Context-first picko3 Mini
Sample savings$4.758.7%
10x traffic gap$47

o3 Mini is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $47. 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 shapeToken mixBetter picko3 MiniNano Banana Pro (Gemini 3 Pro Image Preview)
Input-heavy / RAG5M input + 500K outputo3 Mini$7.7$16
Balanced workload1M input + 1M outputo3 Mini$5.5$14
Output-heavy chatbot1M input + 5M outputo3 Mini$23.1$62
Cheaper input o3 Mini $1.1 vs $2 / 1M

o3 Mini is $0.9 cheaper per 1M input tokens (45% lower; 1.82x difference).

Cheaper output o3 Mini $4.4 vs $12 / 1M

o3 Mini is $7.6 cheaper per 1M output tokens (63.3% lower; 2.73x difference).

Larger context o3 Mini 200K vs 65.54K

o3 Mini has 134.46K more context (3.05x larger).

Sample workload o3 Mini $3.3 vs $8

o3 Mini is $4.7 cheaper on the standard workload (58.7% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
o3 Mini Calculating… Estimated API cost
Nano Banana Pro (Gemini 3 Pro Image Preview) 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; o3 Mini 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 $3.3 for o3 Mini and $8 for Nano Banana Pro (Gemini 3 Pro Image Preview).

Best Fit

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

Choose Nano Banana Pro (Gemini 3 Pro Image Preview) when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Decision Notes
  • On the standard 1M input plus 500K output workload, o3 Mini is estimated at $3.3 vs $8 for Nano Banana Pro (Gemini 3 Pro Image Preview), saving $4.7 (58.7% lower).
  • o3 Mini is $4.7 cheaper on the standard workload (58.7% lower).
  • o3 Mini is $0.9 cheaper per 1M input tokens (45% lower; 1.82x difference).
  • o3 Mini is $7.6 cheaper per 1M output tokens (63.3% lower; 2.73x difference).
  • o3 Mini has 134.46K more context (3.05x larger).
Head-to-Head Specs
Featureo3 Mini
(OpenAI)		Nano Banana Pro (Gemini 3 Pro Image Preview)
(Google)
Input Price
prompt tokens per 1M		$1.1$2
Completion Price
per 1M tokens		$4.4$12
Sample Workload Cost
1M input + 500K output		$3.3$8
Context Window200K65.54K
Release Date
Popularity#122#128

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productiono3 MiniOn the standard 1M input plus 500K output workload, o3 Mini is estimated at $3.3 vs $8 for Nano Banana Pro (Gemini 3 Pro Image Preview), saving $4.7 (58.7% lower).
High-volume input processingo3 MiniLower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotso3 MiniLower output-token price matters most when assistants generate many completion tokens.
RAG or long-document worko3 MiniA larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps
  • gpt-oss-120b (free) can replace o3 Mini when lower sample workload cost matters most: $0.
  • gpt-oss-20b (free) can replace o3 Mini when lower sample workload cost matters most: $0.
  • gpt-oss-20b can replace o3 Mini when lower sample workload cost matters most: $0.1.
  • gpt-oss-120b can replace o3 Mini when lower sample workload cost matters most: $0.13.
Larger context near this budget
  • Llama 4 Scout offers 10M context with $0.25 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.
  • GPT-5.4 offers 1.05M context with $10 sample workload cost.

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

Open cheapest models

Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

Open largest context models

Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

Open provider hubs

OpenAI catalog

Review all tracked OpenAI models before deciding whether this matchup is the right shortlist.

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Google catalog

Check other Google models with comparable pricing, context, or release timing.

Open Google models
o3 Mini

OpenAI o3-mini is a cost-efficient language model optimized for STEM reasoning tasks, particularly excelling in science, mathematics, and coding. This model supports the `reasoning_effort` parameter, which can be set to...

Nano Banana Pro (Gemini 3 Pro Image Preview)

Nano Banana Pro is Google’s most advanced image-generation and editing model, built on Gemini 3 Pro. It extends the original Nano Banana with significantly improved multimodal reasoning, real-world grounding, and...