Grok 4.20 (Non-Reasoning) vs Aion-3.0-Mini vs MiMo-V2-Pro
Grok 4.20 (Non-Reasoning) comes out ahead, 52 to 42 and 41 on our weighted score, though Aion-3.0-Mini is 44% cheaper per token.
- Our pick
xAIGrok 4.20 (Non-Reasoning)
52/100- ECI—
- Price$1.25 / $2.50
- Context1M
Aion Labs
Aion-3.0-Mini
41/100- ECI—
- Price$0.70 / $1.40
- Context131K
XiaomiMiMo-V2-Pro
42/100- ECI—
- Price$1.00 / $3.00
- Context1.05M
Grok 4.20 (Non-Reasoning) is our pick
Grok 4.20 (Non-Reasoning) is the better all-round choice, scoring 52/100 against MiMo-V2-Pro (42) and Aion-3.0-Mini (41). It leads on inputs & features. Aion-3.0-Mini wins on price. 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 priceAion-3.0-MiniAion-3.0-Mini $0.875 · MiMo-V2-Pro $1.50 · Grok 4.20 (Non-Reasoning) $1.56 per 1M tokens (3:1 blend)
- Longest contextMiMo-V2-ProMiMo-V2-Pro 1,048,576 · Grok 4.20 (Non-Reasoning) 1,000,000 · Aion-3.0-Mini 131,072 tokens
- Widest inputsGrok 4.20 (Non-Reasoning)Grok 4.20 (Non-Reasoning): Text, Images, PDFs · Aion-3.0-Mini: Text · MiMo-V2-Pro: Text
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | Grok 4.20 (Non-Reasoning) | Aion-3.0-Mini | MiMo-V2-Pro |
|---|---|---|---|---|
| Price | 50% | 39 | 50 | 40 |
| Inputs & features | 30% | 70 | 35 | 35 |
| Context window | 20% | 60 | 25 | 61 |
| Overall | 100% | 52/100 | 41/100 | 42/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Grok 4.20 (Non-Reasoning)xAI | Aion-3.0-MiniAion Labs | MiMo-V2-ProXiaomi |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $1.25 | $0.70 (best) | $1.00 |
| Output | $2.50 | $1.40 (best) | $3.00 |
| Cached input | $0.20 | — | — |
| Blended (3:1) | $1.56 | $0.875 (best) | $1.50 |
| Long-context rate | Over 200K: $2.50 / $5.00 | Same rate | Same rate |
| Price source | Official xAI API | Median of 4 providers | Median of 1 providers |
| Limits | |||
| Context window | 1,000,000 tokens | 131,072 tokens | 1,048,576 tokens (best) |
| Max output | 30,000 tokens | 32,768 tokens | 131,072 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | No | No |
| PDFs | Yes | No | No |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | No | Yes | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | No |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | grok-4.20-0309-non-reasoning | — | — |
| API providers | 13 (best) | 4 | 2 |
| Released | Mar 9, 2026 | May 14, 2026 | Mar 18, 2026 |
| Knowledge cutoff | — | — | Dec 2024 |
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
- Aion-3.0-Mini$9.80
- MiMo-V2-Pro$16.00
Which should you choose?
Which is better: Grok 4.20 (Non-Reasoning), Aion-3.0-Mini or MiMo-V2-Pro?
Grok 4.20 (Non-Reasoning) is the better all-round choice, scoring 52/100 against MiMo-V2-Pro (42) and Aion-3.0-Mini (41). It leads on inputs & features. Aion-3.0-Mini wins on price. 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), Aion-3.0-Mini or MiMo-V2-Pro?
Aion-3.0-Mini is cheaper at $0.70 input / $1.40 output per million tokens (median across 4 API providers). MiMo-V2-Pro costs $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). At a typical mix of three input tokens to one output token, that is $0.875 per million tokens for Aion-3.0-Mini versus $1.50 for MiMo-V2-Pro (1.7× as much) and $1.56 for Grok 4.20 (Non-Reasoning) (1.8× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Grok 4.20 (Non-Reasoning) has not been scored yet, Aion-3.0-Mini 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 Grok 4.20 (Non-Reasoning), Aion-3.0-Mini 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 Aion-3.0-Mini. Maximum output per response: Grok 4.20 (Non-Reasoning) up to 30,000, Aion-3.0-Mini up to 32,768, MiMo-V2-Pro up to 131,072 tokens.
Which can read images, PDFs, audio or video?
Grok 4.20 (Non-Reasoning) accepts text, images and PDFs; Aion-3.0-Mini accepts text; MiMo-V2-Pro accepts text. Grok 4.20 (Non-Reasoning) handles the widest range of inputs.
Are any of these open source?
No. Grok 4.20 (Non-Reasoning), Aion-3.0-Mini and MiMo-V2-Pro are proprietary and only available through APIs and apps.
Which is newer?
Aion-3.0-Mini is the newest, released May 14, 2026. MiMo-V2-Pro came out Mar 18, 2026; Grok 4.20 (Non-Reasoning) came out Mar 9, 2026. Knowledge cutoff: 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.
