Grok 4.20 vs Xiaomi MiMo-V2.5-Pro
Grok 4.20 (2026) and Xiaomi MiMo-V2.5-Pro (2026) are agentic coding models from xAI and Xiaomi. Grok 4.20 ships a 2M-token context window, while Xiaomi MiMo-V2.5-Pro ships a 1M-token context window. On SWE-bench Verified, Xiaomi MiMo-V2.5-Pro leads by 2.2 pts. On pricing, Xiaomi MiMo-V2.5-Pro costs $1/1M input tokens versus $1.25/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Xiaomi MiMo-V2.5-Pro is safer overall; choose Grok 4.20 when reasoning depth matters.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-01-01 | 2026-04-22 |
| Context window | 2M | 1M |
| Parameters | — | 1T |
| Architecture | - | mixture of experts |
| License | Proprietary | Proprietary |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Grok 4.20 | Xiaomi MiMo-V2.5-Pro |
|---|---|---|
| Input price | $1.25/1M tokens | $1/1M tokens |
| Output price | $2.5/1M tokens | $3/1M tokens |
| Providers |
Capabilities
| Capability | Grok 4.20 | Xiaomi MiMo-V2.5-Pro |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | Yes | No |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | No |
Benchmarks
| Benchmark | Grok 4.20 | Xiaomi MiMo-V2.5-Pro |
|---|---|---|
| SWE-bench Verified | 76.7 | 78.9 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Grok 4.20 at 76.7 and Xiaomi MiMo-V2.5-Pro at 78.9, with Xiaomi MiMo-V2.5-Pro ahead by 2.2 points. The largest visible gap is 2.2 points on SWE-bench Verified, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on reasoning mode: Grok 4.20. Both models share function calling, tool use, and structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Grok 4.20 lists $1.25/1M input and $2.5/1M output tokens, while Xiaomi MiMo-V2.5-Pro lists $1/1M input and $3/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Xiaomi MiMo-V2.5-Pro lower by about $0.03 per million blended tokens. Availability is 2 providers versus 1, so concentration risk also matters.
Choose Grok 4.20 when reasoning depth, larger context windows, and broader provider choice are central to the workload. Choose Xiaomi MiMo-V2.5-Pro when coding workflow support and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Grok 4.20 or Xiaomi MiMo-V2.5-Pro?
Grok 4.20 supports 2M tokens, while Xiaomi MiMo-V2.5-Pro supports 1M tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Grok 4.20 or Xiaomi MiMo-V2.5-Pro?
Xiaomi MiMo-V2.5-Pro is cheaper on tracked token pricing. Grok 4.20 costs $1.25/1M input and $2.5/1M output tokens. Xiaomi MiMo-V2.5-Pro costs $1/1M input and $3/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Grok 4.20 or Xiaomi MiMo-V2.5-Pro open source?
Grok 4.20 is listed under Proprietary. Xiaomi MiMo-V2.5-Pro is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for reasoning mode, Grok 4.20 or Xiaomi MiMo-V2.5-Pro?
Grok 4.20 has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for function calling, Grok 4.20 or Xiaomi MiMo-V2.5-Pro?
Both Grok 4.20 and Xiaomi MiMo-V2.5-Pro expose function calling. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Where can I run Grok 4.20 and Xiaomi MiMo-V2.5-Pro?
Grok 4.20 is available on xAI Console and OpenRouter. Xiaomi MiMo-V2.5-Pro is available on OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Continue comparing
Last reviewed: 2026-05-14. Data sourced from public model cards and provider documentation.