API cost decision in 10 seconds

NewXing4.0 29B A4B (free) vs MiMo-V2.6-Pro-UltraSpeed

Pick Xing4.0 29B A4B (free) for lower cost; pick MiMo-V2.6-Pro-UltraSpeed only if the larger context window matters more.

Page updated: 2026-10-16T20:07:48Z Data confirmed: 2026-10-16T21:07:49Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Xing4.0 29B A4B (free) for lower cost; pick MiMo-V2.6-Pro-UltraSpeed only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Xing4.0 29B A4B (free) is estimated at $0 vs $8.7 for MiMo-V2.6-Pro-UltraSpeed, saving $8.7 (100% lower).

Cost-first pickXing4.0 29B A4B (free)

Context-first pickMiMo-V2.6-Pro-UltraSpeed

Sample savings$8.7100%

10x traffic gap$87

MiMo-V2.6-Pro-UltraSpeed has more context, but Xing4.0 29B A4B (free) saves $8.7 on the standard workload. At 10x that traffic, the same price gap is about $87. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Xing4.0 29B A4B (free) stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Xing4.0 29B A4B (free)	MiMo-V2.6-Pro-UltraSpeed
Input-heavy / RAG	5M input + 500K output	Xing4.0 29B A4B (free)	$0	$26.1
Balanced workload	1M input + 1M output	Xing4.0 29B A4B (free)	$0	$13.05
Output-heavy chatbot	1M input + 5M output	Xing4.0 29B A4B (free)	$0	$47.85

Cheaper input Xing4.0 29B A4B (free) $0 vs $4.35 / 1M

Xing4.0 29B A4B (free) is free for input tokens while MiMo-V2.6-Pro-UltraSpeed costs $4.35 per 1M tokens.

Cheaper output Xing4.0 29B A4B (free) $0 vs $8.7 / 1M

Xing4.0 29B A4B (free) is free for output tokens while MiMo-V2.6-Pro-UltraSpeed costs $8.7 per 1M tokens.

Larger context MiMo-V2.6-Pro-UltraSpeed 262.14K vs 1.05M

MiMo-V2.6-Pro-UltraSpeed has 786.43K more context (4x larger).

Sample workload Xing4.0 29B A4B (free) $0 vs $8.7

Xing4.0 29B A4B (free) is free for the standard workload while the other model is estimated at $8.7.

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Xing4.0 29B A4B (free) Calculating… Estimated API cost

MiMo-V2.6-Pro-UltraSpeed 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

Xing4.0 29B A4B (free) has the lower input price; Xing4.0 29B A4B (free) has the lower output price; MiMo-V2.6-Pro-UltraSpeed offers the larger context window. For the 1M input plus 500K output sample, Xing4.0 29B A4B (free) is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $0 for Xing4.0 29B A4B (free) and $8.7 for MiMo-V2.6-Pro-UltraSpeed.

Best Fit

Choose Xing4.0 29B A4B (free) when you care most about lower input-token price, and lower output-token price.

Choose MiMo-V2.6-Pro-UltraSpeed when you care most about larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, Xing4.0 29B A4B (free) is estimated at $0 vs $8.7 for MiMo-V2.6-Pro-UltraSpeed, saving $8.7 (100% lower).
Xing4.0 29B A4B (free) is free for the standard workload while the other model is estimated at $8.7.
Xing4.0 29B A4B (free) is free for input tokens while MiMo-V2.6-Pro-UltraSpeed costs $4.35 per 1M tokens.
Xing4.0 29B A4B (free) is free for output tokens while MiMo-V2.6-Pro-UltraSpeed costs $8.7 per 1M tokens.
MiMo-V2.6-Pro-UltraSpeed has 786.43K more context (4x larger).

Head-to-Head Specs

Feature	NewXing4.0 29B A4B (free) (XingChen)	MiMo-V2.6-Pro-UltraSpeed (Xiaomi)
Input Price prompt tokens per 1M	$0	$4.35
Completion Price per 1M tokens	$0	$8.7
Sample Workload Cost 1M input + 500K output	$0	$8.7
Context Window	262.14K	1.05M
Release Date	2026-10-16	2026-09-21

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Xing4.0 29B A4B (free)	On the standard 1M input plus 500K output workload, Xing4.0 29B A4B (free) is estimated at $0 vs $8.7 for MiMo-V2.6-Pro-UltraSpeed, saving $8.7 (100% lower).
High-volume input processing	Xing4.0 29B A4B (free)	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Xing4.0 29B A4B (free)	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	MiMo-V2.6-Pro-UltraSpeed	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

MiMo-V2-Flash can replace MiMo-V2.6-Pro-UltraSpeed when lower sample workload cost matters most: $0.25.
MiMo-V2.6-Flash can replace MiMo-V2.6-Pro-UltraSpeed when lower sample workload cost matters most: $0.28.
MiMo-V2.5 can replace MiMo-V2.6-Pro-UltraSpeed when lower sample workload cost matters most: $0.28.
MiMo-V2.6-Pro can replace MiMo-V2.6-Pro-UltraSpeed when lower sample workload cost matters most: $0.87.

Larger context near this budget

Grok 4.20 Multi-Agent offers 2M context with $2.5 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.
Llama 4 Scout offers 1.31M context with $0.25 sample workload cost.
MiMo-V2.6-Flash offers 1.05M context with $0.28 sample workload cost.

Popular competitors

DeepSeek V4.1 Flash · DeepSeek · #1
Step 5 Preview · StepFun · #2
GLM 5.3 Flash · Z.ai · #3
MiMo-V2.6-Flash · Xiaomi · #4

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.

Open provider hubs

XingChen catalog

Review all tracked XingChen models before deciding whether this matchup is the right shortlist.

Open XingChen models

Xiaomi catalog

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

Open Xiaomi models

Xing4.0 29B A4B (free)

Xing4.0-29B-A4B is an open-weight mixture-of-experts language model from China Telecom's AI team (TeleAI) and the successor to the TeleChat series. It has 29B total parameters with 4B active per token...

MiMo-V2.6-Pro-UltraSpeed

MiMo-V2.6-Pro-UltraSpeed is the fast speed edition of Xiaomi's flagship foundation model, MiMo-V2.6-Pro. Built from the same 1T MiMo-V2.6-Pro checkpoint, it matches the original model in quality while delivering roughly 10x...