API cost decision in 10 seconds

Gemini 3.1 Pro Preview vs LFM2.5-1.2B-Thinking (free)

Pick LFM2.5-1.2B-Thinking (free) for lower cost; pick Gemini 3.1 Pro Preview only if the larger context window matters more.

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

Budget verdict

Pick LFM2.5-1.2B-Thinking (free) for lower cost; pick Gemini 3.1 Pro Preview only if the larger context window matters more.

On the standard 1M input plus 500K output workload, LFM2.5-1.2B-Thinking (free) is estimated at $0 vs $8 for Gemini 3.1 Pro Preview, saving $8 (100% lower).

Cost-first pickLFM2.5-1.2B-Thinking (free)

Context-first pickGemini 3.1 Pro Preview

Sample savings$8100%

10x traffic gap$80

Gemini 3.1 Pro Preview has more context, but LFM2.5-1.2B-Thinking (free) saves $8 on the standard workload. At 10x that traffic, the same price gap is about $80. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

LFM2.5-1.2B-Thinking (free) stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Gemini 3.1 Pro Preview	LFM2.5-1.2B-Thinking (free)
Input-heavy / RAG	5M input + 500K output	LFM2.5-1.2B-Thinking (free)	$16	$0
Balanced workload	1M input + 1M output	LFM2.5-1.2B-Thinking (free)	$14	$0
Output-heavy chatbot	1M input + 5M output	LFM2.5-1.2B-Thinking (free)	$62	$0

Cheaper input LFM2.5-1.2B-Thinking (free) $2 vs $0 / 1M

LFM2.5-1.2B-Thinking (free) is free for input tokens while Gemini 3.1 Pro Preview costs $2 per 1M tokens.

Cheaper output LFM2.5-1.2B-Thinking (free) $12 vs $0 / 1M

LFM2.5-1.2B-Thinking (free) is free for output tokens while Gemini 3.1 Pro Preview costs $12 per 1M tokens.

Larger context Gemini 3.1 Pro Preview 1.05M vs 32.77K

Gemini 3.1 Pro Preview has 1.02M more context (32x larger).

Sample workload LFM2.5-1.2B-Thinking (free) $8 vs $0

LFM2.5-1.2B-Thinking (free) is free for the standard workload while the other model is estimated at $8.

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Gemini 3.1 Pro Preview Calculating… Estimated API cost

LFM2.5-1.2B-Thinking (free) 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

LFM2.5-1.2B-Thinking (free) has the lower input price; LFM2.5-1.2B-Thinking (free) has the lower output price; Gemini 3.1 Pro Preview offers the larger context window. For the 1M input plus 500K output sample, LFM2.5-1.2B-Thinking (free) is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $8 for Gemini 3.1 Pro Preview and $0 for LFM2.5-1.2B-Thinking (free).

Best Fit

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

Choose LFM2.5-1.2B-Thinking (free) when you care most about lower input-token price, and lower output-token price.

Decision Notes

On the standard 1M input plus 500K output workload, LFM2.5-1.2B-Thinking (free) is estimated at $0 vs $8 for Gemini 3.1 Pro Preview, saving $8 (100% lower).
LFM2.5-1.2B-Thinking (free) is free for the standard workload while the other model is estimated at $8.
LFM2.5-1.2B-Thinking (free) is free for input tokens while Gemini 3.1 Pro Preview costs $2 per 1M tokens.
LFM2.5-1.2B-Thinking (free) is free for output tokens while Gemini 3.1 Pro Preview costs $12 per 1M tokens.
Gemini 3.1 Pro Preview has 1.02M more context (32x larger).

Head-to-Head Specs

Feature	Gemini 3.1 Pro Preview (Google)	LFM2.5-1.2B-Thinking (free) (LiquidAI)
Input Price prompt tokens per 1M	$2	$0
Completion Price per 1M tokens	$12	$0
Sample Workload Cost 1M input + 500K output	$8	$0
Context Window	1.05M	32.77K
Release Date	2026-02-19	2026-01-20

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	LFM2.5-1.2B-Thinking (free)	On the standard 1M input plus 500K output workload, LFM2.5-1.2B-Thinking (free) is estimated at $0 vs $8 for Gemini 3.1 Pro Preview, saving $8 (100% lower).
High-volume input processing	LFM2.5-1.2B-Thinking (free)	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	LFM2.5-1.2B-Thinking (free)	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Gemini 3.1 Pro Preview	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 Gemini 3.1 Pro Preview when lower sample workload cost matters most: $0.
Gemma 4 31B (free) can replace Gemini 3.1 Pro Preview when lower sample workload cost matters most: $0.
Lyria 3 Pro Preview can replace Gemini 3.1 Pro Preview when lower sample workload cost matters most: $0.
Lyria 3 Clip Preview can replace Gemini 3.1 Pro 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 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.

Popular competitors

No popular competitor is currently available.

Cheaper alternatives

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Larger context alternatives

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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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LiquidAI catalog

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Gemini 3.1 Pro Preview

Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation...

LFM2.5-1.2B-Thinking (free)

LFM2.5-1.2B-Thinking is a lightweight reasoning-focused model optimized for agentic tasks, data extraction, and RAG—while still running comfortably on edge devices. It supports long context (up to 32K tokens) and is...