API cost decision in 10 seconds

🔥Kimi K2.6 vs 🔥Grok 4.1 Fast

Pick Grok 4.1 Fast when budget and context both matter.

Pricing data updated: 2026-05-13T16:32:23Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Grok 4.1 Fast when budget and context both matter.

On the standard 1M input plus 500K output workload, Grok 4.1 Fast is estimated at $0.45 vs $2.49 for Kimi K2.6, saving $2.04 (81.9% lower).

Cost-first pickGrok 4.1 Fast

Context-first pickGrok 4.1 Fast

Sample savings$2.0481.9%

10x traffic gap$20.4

Grok 4.1 Fast is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $20.4. Use the calculator below to replace the sample workload with your own token volume.

Cheaper input Grok 4.1 Fast $0.74 vs $0.2 / 1M

Grok 4.1 Fast is $0.54 cheaper per 1M input tokens (73% lower; 3.7x difference).

Cheaper output Grok 4.1 Fast $3.5 vs $0.5 / 1M

Grok 4.1 Fast is $3 cheaper per 1M output tokens (85.7% lower; 7x difference).

Larger context Grok 4.1 Fast 262.14K vs 2M

Grok 4.1 Fast has 1.74M more context (7.63x larger).

Sample workload Grok 4.1 Fast $2.49 vs $0.45

Grok 4.1 Fast is $2.04 cheaper on the standard workload (81.9% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Kimi K2.6 Calculating… Estimated API cost

Grok 4.1 Fast 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

Grok 4.1 Fast has the lower input price; Grok 4.1 Fast has the lower output price; Grok 4.1 Fast offers the larger context window. For the 1M input plus 500K output sample, Grok 4.1 Fast is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $2.49 for Kimi K2.6 and $0.45 for Grok 4.1 Fast.

Best Fit

Choose Kimi K2.6 when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Choose Grok 4.1 Fast when you care most about lower input-token price, lower output-token price, and larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, Grok 4.1 Fast is estimated at $0.45 vs $2.49 for Kimi K2.6, saving $2.04 (81.9% lower).
Grok 4.1 Fast is $2.04 cheaper on the standard workload (81.9% lower).
Grok 4.1 Fast is $0.54 cheaper per 1M input tokens (73% lower; 3.7x difference).
Grok 4.1 Fast is $3 cheaper per 1M output tokens (85.7% lower; 7x difference).
Grok 4.1 Fast has 1.74M more context (7.63x larger).

Head-to-Head Specs

Feature	🔥Kimi K2.6 (MoonshotAI)	🔥Grok 4.1 Fast (xAI)
Input Price prompt tokens per 1M	$0.74	$0.2
Completion Price per 1M tokens	$3.5	$0.5
Sample Workload Cost 1M input + 500K output	$2.49	$0.45
Context Window	262.14K	2M
Release Date	2026-04-20	2025-11-19
Popularity Rank current rank	#5	#18

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Grok 4.1 Fast	On the standard 1M input plus 500K output workload, Grok 4.1 Fast is estimated at $0.45 vs $2.49 for Kimi K2.6, saving $2.04 (81.9% lower).
High-volume input processing	Grok 4.1 Fast	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Grok 4.1 Fast	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Grok 4.1 Fast	A larger context window leaves more room for retrieved passages, conversation history, or source files.

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xAI catalog

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Kimi K2.6

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Grok 4.1 Fast

Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using...