ZMIME
Comparison · 2 models · Updated Oct 4, 2026

Grok 4.20 (Non-Reasoning) vs MiMo-V2.5-Pro-UltraSpeed

Grok 4.20 (Non-Reasoning) comes out ahead, 53 to 43 on our weighted score, and it is the cheaper option too.

  1. Our pick

    xAI

    Grok 4.20 (Non-Reasoning)

    Released Mar 9, 2026

    53/100
    • ECI—
    • Price$1.25 / $2.50
    • Context1M
    Full specs Remove Grok 4.20 (Non-Reasoning)

  2. Xiaomi

    MiMo-V2.5-Pro-UltraSpeed

    Released Jun 8, 2026Beta

    43/100
    • ECI—
    • Price$1.30 / $2.61
    • Context1.05M
    Full specs Remove MiMo-V2.5-Pro-UltraSpeed

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Grok 4.20 (Non-Reasoning) is our pick

Grok 4.20 (Non-Reasoning) is the better all-round choice, scoring 53/100 against MiMo-V2.5-Pro-UltraSpeed (43). It leads on inputs & features. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

  • CapabilityNot enough dataNo independent benchmark covers every model here yet
  • Lowest priceGrok 4.20 (Non-Reasoning)Grok 4.20 (Non-Reasoning) $1.56 · MiMo-V2.5-Pro-UltraSpeed $1.63 per 1M tokens (3:1 blend)
  • Longest contextMiMo-V2.5-Pro-UltraSpeedMiMo-V2.5-Pro-UltraSpeed 1,048,576 · Grok 4.20 (Non-Reasoning) 1,000,000 tokens
  • Widest inputsGrok 4.20 (Non-Reasoning)Grok 4.20 (Non-Reasoning): Text, Images, PDFs · MiMo-V2.5-Pro-UltraSpeed: Text
  • Self-hostingMiMo-V2.5-Pro-UltraSpeedPublishes downloadable weights
How the score is built
MeasureWeightGrok 4.20 (Non-Reasoning)MiMo-V2.5-Pro-UltraSpeed
Price50%4140
Inputs & features30%7035
Context window20%6061
Overall100%53/10043/100

Left out because at least one model lacks the data: capability. The remaining weights were rescaled.

02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Grok 4.20 (Non-Reasoning) vs MiMo-V2.5-Pro-UltraSpeed specifications side by side
SpecificationGrok 4.20 (Non-Reasoning)xAIMiMo-V2.5-Pro-UltraSpeedXiaomi
Capability
Capabilities Index (ECI)——
ECI rank——
Price per million tokens
Input$1.25 (best)$1.30
Output$2.50 (best)$2.61
Cached input$0.20$0.011 (best)
Blended (3:1)$1.56 (best)$1.63
Long-context rateOver 200K: $2.50 / $5.00Same rate
Price sourceOfficial xAI APIOfficial Xiaomi API
Limits
Context window1,000,000 tokens1,048,576 tokens (best)
Max output30,000 tokens131,072 tokens (best)
Inputs and features
TextYesYes
ImagesYesNo
PDFsYesNo
AudioNoNo
VideoNoNo
ReasoningNoYes
Tool callingYesYes
Structured outputYesNo
Availability
WeightsProprietaryOpen
API model IDgrok-4.20-0309-non-reasoningmimo-v2.5-pro-ultraspeed
API providers10 (best)1
ReleasedMar 9, 2026Jun 8, 2026
Knowledge cutoff—Dec 2024
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • Grok 4.20 (Non-Reasoning)$17.50
  • MiMo-V2.5-Pro-UltraSpeed$18.27
04 — Questions

Which should you choose?

Which is better: Grok 4.20 (Non-Reasoning) or MiMo-V2.5-Pro-UltraSpeed?

Grok 4.20 (Non-Reasoning) is the better all-round choice, scoring 53/100 against MiMo-V2.5-Pro-UltraSpeed (43). It leads on inputs & features. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

Which is cheaper, Grok 4.20 (Non-Reasoning) or MiMo-V2.5-Pro-UltraSpeed?

Grok 4.20 (Non-Reasoning) is cheaper at $1.25 input / $2.50 output per million tokens (official xAI API price). MiMo-V2.5-Pro-UltraSpeed costs $1.30 input / $2.61 output per million tokens (official Xiaomi API price). At a typical mix of three input tokens to one output token, that is $1.56 per million tokens for Grok 4.20 (Non-Reasoning) versus $1.63 for MiMo-V2.5-Pro-UltraSpeed (1× as much).

Which scores higher on benchmarks?

There is no independent benchmark that covers both models yet. Grok 4.20 (Non-Reasoning) has not been scored yet and MiMo-V2.5-Pro-UltraSpeed has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for Grok 4.20 (Non-Reasoning) and MiMo-V2.5-Pro-UltraSpeed yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.

Which has the bigger context window?

MiMo-V2.5-Pro-UltraSpeed has the largest context window at 1,048,576 tokens, against 1,000,000 for Grok 4.20 (Non-Reasoning). Maximum output per response: Grok 4.20 (Non-Reasoning) up to 30,000, MiMo-V2.5-Pro-UltraSpeed up to 131,072 tokens.

Which can read images, PDFs, audio or video?

Grok 4.20 (Non-Reasoning) accepts text, images and PDFs; MiMo-V2.5-Pro-UltraSpeed accepts text. Grok 4.20 (Non-Reasoning) handles the widest range of inputs.

Are any of these open source?

MiMo-V2.5-Pro-UltraSpeed publishes its weights and can be self-hosted; Grok 4.20 (Non-Reasoning) is proprietary.

Which is newer?

MiMo-V2.5-Pro-UltraSpeed is the newest, released Jun 8, 2026. Grok 4.20 (Non-Reasoning) came out Mar 9, 2026. Knowledge cutoff: MiMo-V2.5-Pro-UltraSpeed Dec 2024.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.

05 — Keep comparing

Related comparisons