API cost decision in 10 seconds

GPT-5.3 Chat vs Nano Banana Pro (Gemini 3 Pro Image Preview)

Pick Nano Banana Pro (Gemini 3 Pro Image Preview) for lower cost; pick GPT-5.3 Chat only if the larger context window matters more.

Page updated: 2026-05-26T10:03:26Z Data confirmed: 2026-05-26T13:08:02Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Nano Banana Pro (Gemini 3 Pro Image Preview) for lower cost; pick GPT-5.3 Chat only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Nano Banana Pro (Gemini 3 Pro Image Preview) is estimated at $8 vs $8.75 for GPT-5.3 Chat, saving $0.75 (8.6% lower).

Cost-first pickNano Banana Pro (Gemini 3 Pro Image Preview)

Context-first pickGPT-5.3 Chat

Sample savings$0.758.6%

10x traffic gap$7.5

GPT-5.3 Chat has more context, but Nano Banana Pro (Gemini 3 Pro Image Preview) saves $0.75 on the standard workload. At 10x that traffic, the same price gap is about $7.5. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Cost winner changes by workload shape: input-heavy / RAG favors GPT-5.3 Chat, balanced workload favors Nano Banana Pro (Gemini 3 Pro Image Preview), and output-heavy chatbot favors Nano Banana Pro (Gemini 3 Pro Image Preview).

Workload shape	Token mix	Better pick	GPT-5.3 Chat	Nano Banana Pro (Gemini 3 Pro Image Preview)
Input-heavy / RAG	5M input + 500K output	GPT-5.3 Chat	$15.75	$16
Balanced workload	1M input + 1M output	Nano Banana Pro (Gemini 3 Pro Image Preview)	$15.75	$14
Output-heavy chatbot	1M input + 5M output	Nano Banana Pro (Gemini 3 Pro Image Preview)	$71.75	$62

Cheaper input GPT-5.3 Chat $1.75 vs $2 / 1M

GPT-5.3 Chat is $0.25 cheaper per 1M input tokens (12.5% lower; 1.14x difference).

Cheaper output Nano Banana Pro (Gemini 3 Pro Image Preview) $14 vs $12 / 1M

Nano Banana Pro (Gemini 3 Pro Image Preview) is $2 cheaper per 1M output tokens (14.3% lower; 1.17x difference).

Larger context GPT-5.3 Chat 128K vs 65.54K

GPT-5.3 Chat has 62.46K more context (1.95x larger).

Sample workload Nano Banana Pro (Gemini 3 Pro Image Preview) $8.75 vs $8

Nano Banana Pro (Gemini 3 Pro Image Preview) is $0.75 cheaper on the standard workload (8.6% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

GPT-5.3 Chat 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

GPT-5.3 Chat has the lower input price; Nano Banana Pro (Gemini 3 Pro Image Preview) has the lower output price; GPT-5.3 Chat offers the larger context window. For the 1M input plus 500K output sample, Nano Banana Pro (Gemini 3 Pro Image Preview) is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $8.75 for GPT-5.3 Chat and $8 for Nano Banana Pro (Gemini 3 Pro Image Preview).

Best Fit

Choose GPT-5.3 Chat when you care most about lower input-token price, and larger context window.

Choose Nano Banana Pro (Gemini 3 Pro Image Preview) when you care most about lower output-token price.

Decision Notes

On the standard 1M input plus 500K output workload, Nano Banana Pro (Gemini 3 Pro Image Preview) is estimated at $8 vs $8.75 for GPT-5.3 Chat, saving $0.75 (8.6% lower).
Nano Banana Pro (Gemini 3 Pro Image Preview) is $0.75 cheaper on the standard workload (8.6% lower).
GPT-5.3 Chat is $0.25 cheaper per 1M input tokens (12.5% lower; 1.14x difference).
Nano Banana Pro (Gemini 3 Pro Image Preview) is $2 cheaper per 1M output tokens (14.3% lower; 1.17x difference).
GPT-5.3 Chat has 62.46K more context (1.95x larger).

Head-to-Head Specs

Feature	GPT-5.3 Chat (OpenAI)	Nano Banana Pro (Gemini 3 Pro Image Preview) (Google)
Input Price prompt tokens per 1M	$1.75	$2
Completion Price per 1M tokens	$14	$12
Sample Workload Cost 1M input + 500K output	$8.75	$8
Context Window	128K	65.54K
Release Date	2026-03-03	2025-11-20

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Nano Banana Pro (Gemini 3 Pro Image Preview)	On the standard 1M input plus 500K output workload, Nano Banana Pro (Gemini 3 Pro Image Preview) is estimated at $8 vs $8.75 for GPT-5.3 Chat, saving $0.75 (8.6% lower).
High-volume input processing	GPT-5.3 Chat	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Nano Banana Pro (Gemini 3 Pro Image Preview)	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	GPT-5.3 Chat	A 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 GPT-5.3 Chat when lower sample workload cost matters most: $0.
gpt-oss-20b (free) can replace GPT-5.3 Chat when lower sample workload cost matters most: $0.
gpt-oss-20b can replace GPT-5.3 Chat when lower sample workload cost matters most: $0.1.
gpt-oss-120b can replace GPT-5.3 Chat when lower sample workload cost matters most: $0.13.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.
Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.
GPT-5.4 offers 1.05M context with $10 sample workload cost.

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Google catalog

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