API cost decision in 10 seconds

Ministral 3 8B 2512 vs Gemini 3.1 Pro Preview Custom Tools

Pick Ministral 3 8B 2512 for lower cost; pick Gemini 3.1 Pro Preview Custom Tools only if the larger context window matters more.

Page updated: 2026-05-26T15:08:08Z Data confirmed: 2026-05-26T18:08:02Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Ministral 3 8B 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, Ministral 3 8B 2512 is estimated at $0.22 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $7.78 (97.2% lower).

Cost-first pickMinistral 3 8B 2512

Context-first pickGemini 3.1 Pro Preview Custom Tools

Sample savings$7.7897.2%

10x traffic gap$77.75

Gemini 3.1 Pro Preview Custom Tools has more context, but Ministral 3 8B 2512 saves $7.78 on the standard workload. At 10x that traffic, the same price gap is about $77.75. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Ministral 3 8B 2512 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Ministral 3 8B 2512	Gemini 3.1 Pro Preview Custom Tools
Input-heavy / RAG	5M input + 500K output	Ministral 3 8B 2512	$0.82	$16
Balanced workload	1M input + 1M output	Ministral 3 8B 2512	$0.3	$14
Output-heavy chatbot	1M input + 5M output	Ministral 3 8B 2512	$0.9	$62

Cheaper input Ministral 3 8B 2512 $0.15 vs $2 / 1M

Ministral 3 8B 2512 is $1.85 cheaper per 1M input tokens (92.5% lower; 13.3x difference).

Cheaper output Ministral 3 8B 2512 $0.15 vs $12 / 1M

Ministral 3 8B 2512 is $11.85 cheaper per 1M output tokens (98.8% lower; 80x 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 Ministral 3 8B 2512 $0.22 vs $8

Ministral 3 8B 2512 is $7.78 cheaper on the standard workload (97.2% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Ministral 3 8B 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

Ministral 3 8B 2512 has the lower input price; Ministral 3 8B 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, Ministral 3 8B 2512 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $0.22 for Ministral 3 8B 2512 and $8 for Gemini 3.1 Pro Preview Custom Tools.

Best Fit

Choose Ministral 3 8B 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, Ministral 3 8B 2512 is estimated at $0.22 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $7.78 (97.2% lower).
Ministral 3 8B 2512 is $7.78 cheaper on the standard workload (97.2% lower).
Ministral 3 8B 2512 is $1.85 cheaper per 1M input tokens (92.5% lower; 13.3x difference).
Ministral 3 8B 2512 is $11.85 cheaper per 1M output tokens (98.8% lower; 80x difference).
Gemini 3.1 Pro Preview Custom Tools has 786.61K more context (4x larger).

Head-to-Head Specs

Feature	Ministral 3 8B 2512 (Mistral)	Gemini 3.1 Pro Preview Custom Tools (Google)
Input Price prompt tokens per 1M	$0.15	$2
Completion Price per 1M tokens	$0.15	$12
Sample Workload Cost 1M input + 500K output	$0.22	$8
Context Window	262.14K	1.05M
Release Date	2025-12-02	2026-02-25
Popularity	#89	#132

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Ministral 3 8B 2512	On the standard 1M input plus 500K output workload, Ministral 3 8B 2512 is estimated at $0.22 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $7.78 (97.2% lower).
High-volume input processing	Ministral 3 8B 2512	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Ministral 3 8B 2512	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Gemini 3.1 Pro Preview Custom Tools	A 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 Ministral 3 8B 2512 when lower sample workload cost matters most: $0.04.
Mistral Small 3 can replace Ministral 3 8B 2512 when lower sample workload cost matters most: $0.09.
Ministral 3 3B 2512 can replace Ministral 3 8B 2512 when lower sample workload cost matters most: $0.15.
Mistral Small 3.2 24B can replace Ministral 3 8B 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.

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Mistral catalog

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Google catalog

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Ministral 3 8B 2512

A balanced model in the Ministral 3 family, Ministral 3 8B is a powerful, efficient tiny language model with vision capabilities.

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...