API cost decision in 10 seconds

KAT-Coder-Pro V2 vs Mercury 2

Pick Mercury 2 for lower cost; pick KAT-Coder-Pro V2 only if the larger context window matters more.

Page updated: 2026-05-26T10:03:26Z Data confirmed: 2026-05-26T13:08:02Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Mercury 2 for lower cost; pick KAT-Coder-Pro V2 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 $0.9 for KAT-Coder-Pro V2, saving $0.27 (30.6% lower).

Cost-first pickMercury 2

Context-first pickKAT-Coder-Pro V2

Sample savings$0.2730.6%

10x traffic gap$2.75

KAT-Coder-Pro V2 has more context, but Mercury 2 saves $0.27 on the standard workload. At 10x that traffic, the same price gap is about $2.75. 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	KAT-Coder-Pro V2	Mercury 2
Input-heavy / RAG	5M input + 500K output	Mercury 2	$2.1	$1.62
Balanced workload	1M input + 1M output	Mercury 2	$1.5	$1
Output-heavy chatbot	1M input + 5M output	Mercury 2	$6.3	$4

Cheaper input Mercury 2 $0.3 vs $0.25 / 1M

Mercury 2 is $0.05 cheaper per 1M input tokens (16.7% lower; 1.2x difference).

Cheaper output Mercury 2 $1.2 vs $0.75 / 1M

Mercury 2 is $0.45 cheaper per 1M output tokens (37.5% lower; 1.6x difference).

Larger context KAT-Coder-Pro V2 256K vs 128K

KAT-Coder-Pro V2 has 128K more context (2x larger).

Sample workload Mercury 2 $0.9 vs $0.62

Mercury 2 is $0.27 cheaper on the standard workload (30.6% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

KAT-Coder-Pro V2 Calculating… Estimated API cost

Mercury 2 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; KAT-Coder-Pro V2 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 $0.9 for KAT-Coder-Pro V2 and $0.62 for Mercury 2.

Best Fit

Choose KAT-Coder-Pro V2 when you care most about larger context window.

Choose Mercury 2 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, Mercury 2 is estimated at $0.62 vs $0.9 for KAT-Coder-Pro V2, saving $0.27 (30.6% lower).
Mercury 2 is $0.27 cheaper on the standard workload (30.6% lower).
Mercury 2 is $0.05 cheaper per 1M input tokens (16.7% lower; 1.2x difference).
Mercury 2 is $0.45 cheaper per 1M output tokens (37.5% lower; 1.6x difference).
KAT-Coder-Pro V2 has 128K more context (2x larger).

Head-to-Head Specs

Feature	KAT-Coder-Pro V2 (Kwaipilot)	Mercury 2 (Inception)
Input Price prompt tokens per 1M	$0.3	$0.25
Completion Price per 1M tokens	$1.2	$0.75
Sample Workload Cost 1M input + 500K output	$0.9	$0.62
Context Window	256K	128K
Release Date	2026-03-27	2026-03-04

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 $0.9 for KAT-Coder-Pro V2, saving $0.27 (30.6% 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	KAT-Coder-Pro V2	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

No lower-cost same-provider swap is currently tracked for this pair.

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

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

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Kwaipilot catalog

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Inception catalog

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KAT-Coder-Pro V2

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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...