API cost decision in 10 seconds

Nano Banana 2 (Gemini 3.1 Flash Image Preview) vs Kimi K2 Thinking

Pick Kimi K2 Thinking when budget and context both matter.

Pricing data updated: 2026-05-26T11:08:00Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Kimi K2 Thinking when budget and context both matter.

On the standard 1M input plus 500K output workload, Kimi K2 Thinking is estimated at $1.85 vs $2 for Nano Banana 2 (Gemini 3.1 Flash Image Preview), saving $0.15 (7.5% lower).

Cost-first pickKimi K2 Thinking

Context-first pickKimi K2 Thinking

Sample savings$0.157.5%

10x traffic gap$1.5

Kimi K2 Thinking is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $1.5. 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 Nano Banana 2 (Gemini 3.1 Flash Image Preview), balanced workload favors Kimi K2 Thinking, and output-heavy chatbot favors Kimi K2 Thinking.

Workload shape	Token mix	Better pick	Nano Banana 2 (Gemini 3.1 Flash Image Preview)	Kimi K2 Thinking
Input-heavy / RAG	5M input + 500K output	Nano Banana 2 (Gemini 3.1 Flash Image Preview)	$4	$4.25
Balanced workload	1M input + 1M output	Kimi K2 Thinking	$3.5	$3.1
Output-heavy chatbot	1M input + 5M output	Kimi K2 Thinking	$15.5	$13.1

Cheaper input Nano Banana 2 (Gemini 3.1 Flash Image Preview) $0.5 vs $0.6 / 1M

Nano Banana 2 (Gemini 3.1 Flash Image Preview) is $0.1 cheaper per 1M input tokens (16.7% lower; 1.2x difference).

Cheaper output Kimi K2 Thinking $3 vs $2.5 / 1M

Kimi K2 Thinking is $0.5 cheaper per 1M output tokens (16.7% lower; 1.2x difference).

Larger context Kimi K2 Thinking 131.07K vs 262.14K

Kimi K2 Thinking has 131.07K more context (2x larger).

Sample workload Kimi K2 Thinking $2 vs $1.85

Kimi K2 Thinking is $0.15 cheaper on the standard workload (7.5% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Nano Banana 2 (Gemini 3.1 Flash Image Preview) Calculating… Estimated API cost

Kimi K2 Thinking 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

Nano Banana 2 (Gemini 3.1 Flash Image Preview) has the lower input price; Kimi K2 Thinking has the lower output price; Kimi K2 Thinking offers the larger context window. For the 1M input plus 500K output sample, Kimi K2 Thinking is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $2 for Nano Banana 2 (Gemini 3.1 Flash Image Preview) and $1.85 for Kimi K2 Thinking.

Best Fit

Choose Nano Banana 2 (Gemini 3.1 Flash Image Preview) when you care most about lower input-token price.

Choose Kimi K2 Thinking when you care most about lower output-token price, and larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, Kimi K2 Thinking is estimated at $1.85 vs $2 for Nano Banana 2 (Gemini 3.1 Flash Image Preview), saving $0.15 (7.5% lower).
Kimi K2 Thinking is $0.15 cheaper on the standard workload (7.5% lower).
Nano Banana 2 (Gemini 3.1 Flash Image Preview) is $0.1 cheaper per 1M input tokens (16.7% lower; 1.2x difference).
Kimi K2 Thinking is $0.5 cheaper per 1M output tokens (16.7% lower; 1.2x difference).
Kimi K2 Thinking has 131.07K more context (2x larger).

Head-to-Head Specs

Feature	Nano Banana 2 (Gemini 3.1 Flash Image Preview) (Google)	Kimi K2 Thinking (MoonshotAI)
Input Price prompt tokens per 1M	$0.5	$0.6
Completion Price per 1M tokens	$3	$2.5
Sample Workload Cost 1M input + 500K output	$2	$1.85
Context Window	131.07K	262.14K
Release Date	2026-02-26	2025-11-06

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Kimi K2 Thinking	On the standard 1M input plus 500K output workload, Kimi K2 Thinking is estimated at $1.85 vs $2 for Nano Banana 2 (Gemini 3.1 Flash Image Preview), saving $0.15 (7.5% lower).
High-volume input processing	Nano Banana 2 (Gemini 3.1 Flash Image Preview)	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Kimi K2 Thinking	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Kimi K2 Thinking	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

Gemma 4 26B A4B (free) can replace Nano Banana 2 (Gemini 3.1 Flash Image Preview) when lower sample workload cost matters most: $0.
Gemma 4 31B (free) can replace Nano Banana 2 (Gemini 3.1 Flash Image Preview) when lower sample workload cost matters most: $0.
Lyria 3 Pro Preview can replace Nano Banana 2 (Gemini 3.1 Flash Image Preview) when lower sample workload cost matters most: $0.
Lyria 3 Clip Preview can replace Nano Banana 2 (Gemini 3.1 Flash Image Preview) 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.
Owl Alpha offers 1.05M context with $0 sample workload cost.
Gemini 3.1 Flash Lite offers 1.05M context with $1 sample workload cost.

Popular competitors

No popular competitor is currently available.

Cheaper alternatives

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Larger context alternatives

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

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Provider catalogs

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Google catalog

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

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MoonshotAI catalog

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

Open MoonshotAI models

Nano Banana 2 (Gemini 3.1 Flash Image Preview)

Gemini 3.1 Flash Image Preview, a.k.a. "Nano Banana 2," is Google’s latest state of the art image generation and editing model, delivering Pro-level visual quality at Flash speed. It combines...

Kimi K2 Thinking

Kimi K2 Thinking is Moonshot AI’s most advanced open reasoning model to date, extending the K2 series into agentic, long-horizon reasoning. Built on the trillion-parameter Mixture-of-Experts (MoE) architecture introduced in...