API cost decision in 10 seconds

KAT-Coder-Pro V2 vs Gemini 3.1 Pro Preview Custom Tools

Pick KAT-Coder-Pro V2 for lower cost; pick Gemini 3.1 Pro Preview Custom Tools only if the larger context window matters more.

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

Budget verdict

Pick KAT-Coder-Pro V2 for lower cost; pick Gemini 3.1 Pro Preview Custom Tools only if the larger context window matters more.

On the standard 1M input plus 500K output workload, KAT-Coder-Pro V2 is estimated at $0.9 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $7.1 (88.8% lower).

Cost-first pickKAT-Coder-Pro V2
Context-first pickGemini 3.1 Pro Preview Custom Tools
Sample savings$7.188.8%
10x traffic gap$71

Gemini 3.1 Pro Preview Custom Tools has more context, but KAT-Coder-Pro V2 saves $7.1 on the standard workload. At 10x that traffic, the same price gap is about $71. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

KAT-Coder-Pro V2 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickKAT-Coder-Pro V2Gemini 3.1 Pro Preview Custom Tools
Input-heavy / RAG5M input + 500K outputKAT-Coder-Pro V2$2.1$16
Balanced workload1M input + 1M outputKAT-Coder-Pro V2$1.5$14
Output-heavy chatbot1M input + 5M outputKAT-Coder-Pro V2$6.3$62
Cheaper input KAT-Coder-Pro V2 $0.3 vs $2 / 1M

KAT-Coder-Pro V2 is $1.7 cheaper per 1M input tokens (85% lower; 6.67x difference).

Cheaper output KAT-Coder-Pro V2 $1.2 vs $12 / 1M

KAT-Coder-Pro V2 is $10.8 cheaper per 1M output tokens (90% lower; 10x difference).

Larger context Gemini 3.1 Pro Preview Custom Tools 256K vs 1.05M

Gemini 3.1 Pro Preview Custom Tools has 792.76K more context (4.1x larger).

Sample workload KAT-Coder-Pro V2 $0.9 vs $8

KAT-Coder-Pro V2 is $7.1 cheaper on the standard workload (88.8% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
KAT-Coder-Pro V2 Calculating… Estimated API cost
Gemini 3.1 Pro Preview Custom Tools 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

KAT-Coder-Pro V2 has the lower input price; KAT-Coder-Pro V2 has the lower output price; Gemini 3.1 Pro Preview Custom Tools offers the larger context window. For the 1M input plus 500K output sample, KAT-Coder-Pro V2 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $0.9 for KAT-Coder-Pro V2 and $8 for Gemini 3.1 Pro Preview Custom Tools.

Best Fit

Choose KAT-Coder-Pro V2 when you care most about lower input-token price, and lower output-token price.

Choose Gemini 3.1 Pro Preview Custom Tools when you care most about larger context window.

Decision Notes
  • On the standard 1M input plus 500K output workload, KAT-Coder-Pro V2 is estimated at $0.9 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $7.1 (88.8% lower).
  • KAT-Coder-Pro V2 is $7.1 cheaper on the standard workload (88.8% lower).
  • KAT-Coder-Pro V2 is $1.7 cheaper per 1M input tokens (85% lower; 6.67x difference).
  • KAT-Coder-Pro V2 is $10.8 cheaper per 1M output tokens (90% lower; 10x difference).
  • Gemini 3.1 Pro Preview Custom Tools has 792.76K more context (4.1x larger).
Head-to-Head Specs
FeatureKAT-Coder-Pro V2
(Kwaipilot)		Gemini 3.1 Pro Preview Custom Tools
(Google)
Input Price
prompt tokens per 1M		$0.3$2
Completion Price
per 1M tokens		$1.2$12
Sample Workload Cost
1M input + 500K output		$0.9$8
Context Window256K1.05M
Release Date

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionKAT-Coder-Pro V2On the standard 1M input plus 500K output workload, KAT-Coder-Pro V2 is estimated at $0.9 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $7.1 (88.8% lower).
High-volume input processingKAT-Coder-Pro V2Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsKAT-Coder-Pro V2Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGemini 3.1 Pro Preview Custom ToolsA 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 Gemini 3.1 Pro Preview Custom Tools when lower sample workload cost matters most: $0.
  • Gemma 4 31B (free) can replace Gemini 3.1 Pro Preview Custom Tools when lower sample workload cost matters most: $0.
  • Lyria 3 Pro Preview can replace Gemini 3.1 Pro Preview Custom Tools when lower sample workload cost matters most: $0.
  • Lyria 3 Clip Preview can replace Gemini 3.1 Pro Preview Custom Tools 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 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.

Cheaper alternatives

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

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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

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

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Kwaipilot catalog

Review all tracked Kwaipilot 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.

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KAT-Coder-Pro V2

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