API cost decision in 10 seconds

Mercury 2 vs Devstral 2 2512

Pick Mercury 2 for lower cost; pick Devstral 2 2512 only if the larger context window matters more.

Page updated: 2026-05-26T10:03:26Z Data confirmed: 2026-05-26T12:38:15Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Mercury 2 for lower cost; pick Devstral 2 2512 only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Mercury 2 is estimated at $0.62 vs $1.4 for Devstral 2 2512, saving $0.77 (55.4% lower).

Cost-first pickMercury 2

Context-first pickDevstral 2 2512

Sample savings$0.7755.4%

10x traffic gap$7.75

Devstral 2 2512 has more context, but Mercury 2 saves $0.77 on the standard workload. At 10x that traffic, the same price gap is about $7.75. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Mercury 2 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Mercury 2	Devstral 2 2512
Input-heavy / RAG	5M input + 500K output	Mercury 2	$1.62	$3
Balanced workload	1M input + 1M output	Mercury 2	$1	$2.4
Output-heavy chatbot	1M input + 5M output	Mercury 2	$4	$10.4

Cheaper input Mercury 2 $0.25 vs $0.4 / 1M

Mercury 2 is $0.15 cheaper per 1M input tokens (37.5% lower; 1.6x difference).

Cheaper output Mercury 2 $0.75 vs $2 / 1M

Mercury 2 is $1.25 cheaper per 1M output tokens (62.5% lower; 2.67x difference).

Larger context Devstral 2 2512 128K vs 262.14K

Devstral 2 2512 has 134.14K more context (2.05x larger).

Sample workload Mercury 2 $0.62 vs $1.4

Mercury 2 is $0.77 cheaper on the standard workload (55.4% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Mercury 2 Calculating… Estimated API cost

Devstral 2 2512 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

Mercury 2 has the lower input price; Mercury 2 has the lower output price; Devstral 2 2512 offers the larger context window. For the 1M input plus 500K output sample, Mercury 2 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $0.62 for Mercury 2 and $1.4 for Devstral 2 2512.

Best Fit

Choose Mercury 2 when you care most about lower input-token price, and lower output-token price.

Choose Devstral 2 2512 when you care most about larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, Mercury 2 is estimated at $0.62 vs $1.4 for Devstral 2 2512, saving $0.77 (55.4% lower).
Mercury 2 is $0.77 cheaper on the standard workload (55.4% lower).
Mercury 2 is $0.15 cheaper per 1M input tokens (37.5% lower; 1.6x difference).
Mercury 2 is $1.25 cheaper per 1M output tokens (62.5% lower; 2.67x difference).
Devstral 2 2512 has 134.14K more context (2.05x larger).

Head-to-Head Specs

Feature	Mercury 2 (Inception)	Devstral 2 2512 (Mistral)
Input Price prompt tokens per 1M	$0.25	$0.4
Completion Price per 1M tokens	$0.75	$2
Sample Workload Cost 1M input + 500K output	$0.62	$1.4
Context Window	128K	262.14K
Release Date	2026-03-04	2025-12-09

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Mercury 2	On the standard 1M input plus 500K output workload, Mercury 2 is estimated at $0.62 vs $1.4 for Devstral 2 2512, saving $0.77 (55.4% lower).
High-volume input processing	Mercury 2	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Mercury 2	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Devstral 2 2512	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 Devstral 2 2512 when lower sample workload cost matters most: $0.04.
Mistral Small 3 can replace Devstral 2 2512 when lower sample workload cost matters most: $0.09.
Ministral 3 3B 2512 can replace Devstral 2 2512 when lower sample workload cost matters most: $0.15.
Mistral Small 3.2 24B can replace Devstral 2 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.
Owl Alpha offers 1.05M context with $0 sample workload cost.
DeepSeek V4 Flash offers 1.05M context with $0.2 sample workload cost.
DeepSeek V4 Pro offers 1.05M context with $0.87 sample workload cost.

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Cheaper alternatives

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Larger context alternatives

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Provider catalogs

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Inception catalog

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Mistral catalog

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

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Mercury 2

Mercury 2 is an extremely fast reasoning LLM, and the first reasoning diffusion LLM (dLLM). Instead of generating tokens sequentially, Mercury 2 produces and refines multiple tokens in parallel, achieving...

Devstral 2 2512

Devstral 2 is a state-of-the-art open-source model by Mistral AI specializing in agentic coding. It is a 123B-parameter dense transformer model supporting a 256K context window. Devstral 2 supports exploring...