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Comparison · 3 models · Updated Nov 2, 2026

Gemini Robotics-ER 1.6 Preview vs Grok 4.20 (Non-Reasoning) vs MiMo-V2-Pro

Grok 4.20 (Non-Reasoning) comes out ahead, 52 to 46 and 42 on our weighted score.

  1. Google

    Gemini Robotics-ER 1.6 Preview

    Released Apr 14, 2026

    46/100
    • ECI—
    • Price$1.00 / $5.00
    • Context131K
    Full specs Remove Gemini Robotics-ER 1.6 Preview
  2. Our pick

    xAI

    Grok 4.20 (Non-Reasoning)

    Released Mar 9, 2026

    52/100
    • ECI—
    • Price$1.25 / $2.50
    • Context1M
    Full specs Remove Grok 4.20 (Non-Reasoning)

  3. Xiaomi

    MiMo-V2-Pro

    Released Mar 18, 2026

    42/100
    • ECI—
    • Price$1.00 / $3.00
    • Context1.05M
    Full specs Remove MiMo-V2-Pro
01 — Verdict

Grok 4.20 (Non-Reasoning) is our pick

Grok 4.20 (Non-Reasoning) is the better all-round choice, scoring 52/100 against Gemini Robotics-ER 1.6 Preview (46) and MiMo-V2-Pro (42). Gemini Robotics-ER 1.6 Preview wins 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 priceMiMo-V2-ProMiMo-V2-Pro $1.50 · Grok 4.20 (Non-Reasoning) $1.56 · Gemini Robotics-ER 1.6 Preview $2.00 per 1M tokens (3:1 blend)
  • Longest contextMiMo-V2-ProMiMo-V2-Pro 1,048,576 · Grok 4.20 (Non-Reasoning) 1,000,000 · Gemini Robotics-ER 1.6 Preview 131,072 tokens
  • Widest inputsGemini Robotics-ER 1.6 PreviewGemini Robotics-ER 1.6 Preview: Text, Images, Audio, Video · Grok 4.20 (Non-Reasoning): Text, Images, PDFs · MiMo-V2-Pro: Text
  • Self-hostingNo open weightsAll three are available only through APIs
How the score is built
MeasureWeightGemini Robotics-ER 1.6 PreviewGrok 4.20 (Non-Reasoning)MiMo-V2-Pro
Price50%343940
Inputs & features30%807035
Context window20%256061
Overall100%46/10052/10042/100

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.

Gemini Robotics-ER 1.6 Preview vs Grok 4.20 (Non-Reasoning) vs MiMo-V2-Pro specifications side by side
SpecificationGemini Robotics-ER 1.6 PreviewGoogleGrok 4.20 (Non-Reasoning)xAIMiMo-V2-ProXiaomi
Capability
Capabilities Index (ECI)———
ECI rank———
Price per million tokens
Input$1.00 (best)$1.25$1.00 (best)
Output$5.00$2.50 (best)$3.00
Cached input—$0.20—
Blended (3:1)$2.00$1.56$1.50 (best)
Long-context rateSame rateOver 200K: $2.50 / $5.00Same rate
Price sourceMedian of 1 providersOfficial xAI APIMedian of 1 providers
Limits
Context window131,072 tokens1,000,000 tokens1,048,576 tokens (best)
Max output65,536 tokens30,000 tokens131,072 tokens (best)
Inputs and features
TextYesYesYes
ImagesYesYesNo
PDFsNoYesNo
AudioYesNoNo
VideoYesNoNo
ReasoningYesNoYes
Tool callingYesYesYes
Structured outputNoYesNo
Availability
WeightsProprietaryProprietaryProprietary
API model ID—grok-4.20-0309-non-reasoning—
API providers113 (best)2
ReleasedApr 14, 2026Mar 9, 2026Mar 18, 2026
Knowledge cutoffJan 2025—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.

  • Gemini Robotics-ER 1.6 Preview$20.00
  • Grok 4.20 (Non-Reasoning)$17.50
  • MiMo-V2-Pro$16.00
04 — Questions

Which should you choose?

Which is better: Gemini Robotics-ER 1.6 Preview, Grok 4.20 (Non-Reasoning) or MiMo-V2-Pro?

Grok 4.20 (Non-Reasoning) is the better all-round choice, scoring 52/100 against Gemini Robotics-ER 1.6 Preview (46) and MiMo-V2-Pro (42). Gemini Robotics-ER 1.6 Preview wins 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, Gemini Robotics-ER 1.6 Preview, Grok 4.20 (Non-Reasoning) or MiMo-V2-Pro?

MiMo-V2-Pro is cheaper at $1.00 input / $3.00 output per million tokens (median across 1 API provider). Grok 4.20 (Non-Reasoning) costs $1.25 input / $2.50 output per million tokens (official xAI API price); Gemini Robotics-ER 1.6 Preview costs $1.00 input / $5.00 output per million tokens (median across 1 API provider). At a typical mix of three input tokens to one output token, that is $1.50 per million tokens for MiMo-V2-Pro versus $1.56 for Grok 4.20 (Non-Reasoning) (1× as much) and $2.00 for Gemini Robotics-ER 1.6 Preview (1.3× as much).

Which scores higher on benchmarks?

There is no independent benchmark that covers all three models yet. Gemini Robotics-ER 1.6 Preview has not been scored yet, Grok 4.20 (Non-Reasoning) has not been scored yet and MiMo-V2-Pro has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for Gemini Robotics-ER 1.6 Preview, Grok 4.20 (Non-Reasoning) and MiMo-V2-Pro yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.

Which has the bigger context window?

MiMo-V2-Pro has the largest context window at 1,048,576 tokens, against 1,000,000 for Grok 4.20 (Non-Reasoning) and 131,072 for Gemini Robotics-ER 1.6 Preview. Maximum output per response: Gemini Robotics-ER 1.6 Preview up to 65,536, Grok 4.20 (Non-Reasoning) up to 30,000, MiMo-V2-Pro up to 131,072 tokens.

Which can read images, PDFs, audio or video?

Gemini Robotics-ER 1.6 Preview accepts text, images, audio and video; Grok 4.20 (Non-Reasoning) accepts text, images and PDFs; MiMo-V2-Pro accepts text. Gemini Robotics-ER 1.6 Preview handles the widest range of inputs.

Are any of these open source?

No. Gemini Robotics-ER 1.6 Preview, Grok 4.20 (Non-Reasoning) and MiMo-V2-Pro are proprietary and only available through APIs and apps.

Which is newer?

Gemini Robotics-ER 1.6 Preview is the newest, released Apr 14, 2026. MiMo-V2-Pro came out Mar 18, 2026; Grok 4.20 (Non-Reasoning) came out Mar 9, 2026. Knowledge cutoff: Gemini Robotics-ER 1.6 Preview Jan 2025, MiMo-V2-Pro 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 Nov 2, 2026.

05 — Keep comparing

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