API cost decision in 10 seconds

Mistral Large 3 2512 vs Gemini 3.1 Pro Preview Custom Tools

Pick Mistral Large 3 2512 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 Mistral Large 3 2512 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, Mistral Large 3 2512 is estimated at $1.25 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $6.75 (84.4% lower).

Cost-first pickMistral Large 3 2512
Context-first pickGemini 3.1 Pro Preview Custom Tools
Sample savings$6.7584.4%
10x traffic gap$67.5

Gemini 3.1 Pro Preview Custom Tools has more context, but Mistral Large 3 2512 saves $6.75 on the standard workload. At 10x that traffic, the same price gap is about $67.5. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Mistral Large 3 2512 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickMistral Large 3 2512Gemini 3.1 Pro Preview Custom Tools
Input-heavy / RAG5M input + 500K outputMistral Large 3 2512$3.25$16
Balanced workload1M input + 1M outputMistral Large 3 2512$2$14
Output-heavy chatbot1M input + 5M outputMistral Large 3 2512$8$62
Cheaper input Mistral Large 3 2512 $0.5 vs $2 / 1M

Mistral Large 3 2512 is $1.5 cheaper per 1M input tokens (75% lower; 4x difference).

Cheaper output Mistral Large 3 2512 $1.5 vs $12 / 1M

Mistral Large 3 2512 is $10.5 cheaper per 1M output tokens (87.5% lower; 8x difference).

Larger context Gemini 3.1 Pro Preview Custom Tools 262.14K vs 1.05M

Gemini 3.1 Pro Preview Custom Tools has 786.61K more context (4x larger).

Sample workload Mistral Large 3 2512 $1.25 vs $8

Mistral Large 3 2512 is $6.75 cheaper on the standard workload (84.4% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
Mistral Large 3 2512 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

Mistral Large 3 2512 has the lower input price; Mistral Large 3 2512 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, Mistral Large 3 2512 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $1.25 for Mistral Large 3 2512 and $8 for Gemini 3.1 Pro Preview Custom Tools.

Best Fit

Choose Mistral Large 3 2512 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, Mistral Large 3 2512 is estimated at $1.25 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $6.75 (84.4% lower).
  • Mistral Large 3 2512 is $6.75 cheaper on the standard workload (84.4% lower).
  • Mistral Large 3 2512 is $1.5 cheaper per 1M input tokens (75% lower; 4x difference).
  • Mistral Large 3 2512 is $10.5 cheaper per 1M output tokens (87.5% lower; 8x difference).
  • Gemini 3.1 Pro Preview Custom Tools has 786.61K more context (4x larger).
Head-to-Head Specs
FeatureMistral Large 3 2512
(Mistral)		Gemini 3.1 Pro Preview Custom Tools
(Google)
Input Price
prompt tokens per 1M		$0.5$2
Completion Price
per 1M tokens		$1.5$12
Sample Workload Cost
1M input + 500K output		$1.25$8
Context Window262.14K1.05M
Release Date
Popularity#114#132

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionMistral Large 3 2512On the standard 1M input plus 500K output workload, Mistral Large 3 2512 is estimated at $1.25 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $6.75 (84.4% lower).
High-volume input processingMistral Large 3 2512Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsMistral Large 3 2512Lower 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
  • Mistral Nemo can replace Mistral Large 3 2512 when lower sample workload cost matters most: $0.04.
  • Mistral Small 3 can replace Mistral Large 3 2512 when lower sample workload cost matters most: $0.09.
  • Ministral 3 3B 2512 can replace Mistral Large 3 2512 when lower sample workload cost matters most: $0.15.
  • Mistral Small 3.2 24B can replace Mistral Large 3 2512 when lower sample workload cost matters most: $0.17.
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.
  • 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.

Open largest context models

Provider catalogs

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

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Mistral catalog

Review all tracked Mistral 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
Mistral Large 3 2512

Mistral Large 3 2512 is Mistral’s most capable model to date, featuring a sparse mixture-of-experts architecture with 41B active parameters (675B total), and released under the Apache 2.0 license.

Gemini 3.1 Pro Preview Custom Tools

Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...