MiMo-V2-Pro vs Mercury 2 vs Grok 4.20 (Non-Reasoning)
Too close to call on our weighted score (Grok 4.20 (Non-Reasoning) 52, Mercury 2 52, MiMo-V2-Pro 42). The right pick depends on what you value most.
XiaomiMiMo-V2-Pro
42/100- ECI—
- Price$1.00 / $3.00
- Context1.05M
InceptionMercury 2
52/100- ECI—
- Price$0.25 / $0.75
- Context128K
xAIGrok 4.20 (Non-Reasoning)
52/100- ECI—
- Price$1.25 / $2.50
- Context1M
Too close to call
It is close. Our weighted score puts them within a point (Grok 4.20 (Non-Reasoning) 52/100, Mercury 2 52/100, MiMo-V2-Pro 42/100), so choose by what matters most for your work: Mercury 2 on price and MiMo-V2-Pro for long inputs. 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 priceMercury 2Mercury 2 $0.375 · 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 · Mercury 2 128,000 tokens
- Widest inputsGrok 4.20 (Non-Reasoning)MiMo-V2-Pro: Text · Mercury 2: Text · Grok 4.20 (Non-Reasoning): Text, Images, PDFs
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | MiMo-V2-Pro | Mercury 2 | Grok 4.20 (Non-Reasoning) |
|---|---|---|---|---|
| Price | 50% | 40 | 67 | 39 |
| Inputs & features | 30% | 35 | 45 | 70 |
| Context window | 20% | 61 | 24 | 60 |
| Overall | 100% | 42/100 | 52/100 | 52/100 |
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 | MiMo-V2-ProXiaomi | Mercury 2Inception | Grok 4.20 (Non-Reasoning)xAI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $1.00 | $0.25 (best) | $1.25 |
| Output | $3.00 | $0.75 (best) | $2.50 |
| Cached input | — | $0.025 (best) | $0.20 |
| Blended (3:1) | $1.50 | $0.375 (best) | $1.56 |
| Long-context rate | Same rate | Same rate | Over 200K: $2.50 / $5.00 |
| Price source | Median of 1 providers | Official Inception API | Official xAI API |
| Limits | |||
| Context window | 1,048,576 tokens (best) | 128,000 tokens | 1,000,000 tokens |
| Max output | 131,072 tokens (best) | 50,000 tokens | 30,000 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | No | Yes |
| PDFs | No | No | Yes |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | Yes | Yeslow · medium · high | No |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | Yes | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | — | mercury-2 | grok-4.20-0309-non-reasoning |
| API providers | 2 | 7 | 13 (best) |
| Released | Mar 18, 2026 | Feb 24, 2026 | Mar 9, 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.
- MiMo-V2-Pro$16.00
- Mercury 2$4.00
- Grok 4.20 (Non-Reasoning)$17.50
Which should you choose?
Which is better: MiMo-V2-Pro, Mercury 2 or Grok 4.20 (Non-Reasoning)?
It is close. Our weighted score puts them within a point (Grok 4.20 (Non-Reasoning) 52/100, Mercury 2 52/100, MiMo-V2-Pro 42/100), so choose by what matters most for your work: Mercury 2 on price and MiMo-V2-Pro for long inputs. 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, MiMo-V2-Pro, Mercury 2 or Grok 4.20 (Non-Reasoning)?
Mercury 2 is cheaper at $0.25 input / $0.75 output per million tokens (official Inception API price). 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 $0.375 per million tokens for Mercury 2 versus $1.50 for MiMo-V2-Pro (4× as much) and $1.56 for Grok 4.20 (Non-Reasoning) (4.2× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. MiMo-V2-Pro has not been scored yet, Mercury 2 has not been scored yet and Grok 4.20 (Non-Reasoning) has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for MiMo-V2-Pro, Mercury 2 and Grok 4.20 (Non-Reasoning) 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 128,000 for Mercury 2. Maximum output per response: MiMo-V2-Pro up to 131,072, Mercury 2 up to 50,000, Grok 4.20 (Non-Reasoning) up to 30,000 tokens.
Which can read images, PDFs, audio or video?
MiMo-V2-Pro accepts text; Mercury 2 accepts text; Grok 4.20 (Non-Reasoning) accepts text, images and PDFs. Grok 4.20 (Non-Reasoning) handles the widest range of inputs.
Are any of these open source?
No. MiMo-V2-Pro, Mercury 2 and Grok 4.20 (Non-Reasoning) are proprietary and only available through APIs and apps.
Which is newer?
MiMo-V2-Pro is the newest, released Mar 18, 2026. Grok 4.20 (Non-Reasoning) came out Mar 9, 2026; Mercury 2 came out Feb 24, 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.
