Grok 4 vs Xiaomi MiMo-V2.5
Grok 4 (2025) and Xiaomi MiMo-V2.5 (2026) are frontier-tier reasoning models from xAI and Xiaomi. Grok 4 ships a 256k-token context window, while Xiaomi MiMo-V2.5 ships a 1.05m-token context window. On MMLU PRO, Grok 4 leads by 2.1 pts. On pricing, Xiaomi MiMo-V2.5 costs $0.14/1M input tokens versus $1.25/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Xiaomi MiMo-V2.5 is ~793% cheaper at $0.14/1M; pay for Grok 4 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Grok 4 | Xiaomi MiMo-V2.5 |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | RAG, Agents, and Long context |
| Context window | 256k | 1.05m |
| Cheapest output | $2.50/1M tokens | $0.28/1M tokens |
| Provider routes | 4 tracked | 2 tracked |
| Shared benchmarks | MMLU PRO leader | 3 shared |
Decision tradeoffs
- Grok 4 holds a shared-benchmark lead on MMLU PRO, ahead by 2.1 points.
- Grok 4 has broader tracked provider coverage for fallback and route flexibility.
- Grok 4 uniquely exposes Code execution in local model data.
- Local decision data tags Grok 4 for Coding, RAG, and Agents.
- Xiaomi MiMo-V2.5 holds a shared-benchmark lead on AIME 2025, ahead by 2.4 points.
- Xiaomi MiMo-V2.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Xiaomi MiMo-V2.5 has the lower cheapest tracked output price at $0.28/1M tokens.
- Local decision data tags Xiaomi MiMo-V2.5 for RAG, Agents, and Long context.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Grok 4
$1,625
Cheapest tracked route/tier: xAI Console
Xiaomi MiMo-V2.5
$182
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $1,443. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Xiaomi MiMo-V2.5 is $2.22/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Code execution before moving production traffic.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Grok 4 is $2.22/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Grok 4 adds Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-07-09 | 2026-04-22 |
| Context window | 256k | 1.05m |
| Parameters | — | — |
| Architecture | Decoder Only | - |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Grok 4 | Xiaomi MiMo-V2.5 |
|---|---|---|
| Input price | $1.25/1M tokens | $0.14/1M tokens |
| Output price | $2.50/1M tokens | $0.28/1M tokens |
| Providers |
Capabilities
| Capability | Grok 4 | Xiaomi MiMo-V2.5 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Grok 4 | Xiaomi MiMo-V2.5 |
|---|---|---|
| MMLU PRO | 87.0 | 84.9 |
| Google-Proof Q&A | 87.5 | 83.7 |
| AIME 2025 | 91.7 | 94.1 |
Continue comparing
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Last reviewed: 2026-07-10. Data sourced from public model cards and provider documentation.