Grok 4 vs MiMo-V2.5
Grok 4 (2025) and MiMo-V2.5 (2026) are frontier-tier reasoning models from xAI and Xiaomi. Grok 4 ships a 256K-token context window, while MiMo-V2.5 ships a 1M-token context window. On MMLU PRO, Grok 4 leads by 2.1 pts. On pricing, MiMo-V2.5 costs $0.14/1M input tokens versus $3/1M 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.
MiMo-V2.5 is ~2043% cheaper at $0.14/1M; pay for Grok 4 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Grok 4 | 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 | 1M |
| Cheapest output | $15/1M 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.
- MiMo-V2.5 holds a shared-benchmark lead on AIME 2025, ahead by 2.4 points.
- MiMo-V2.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- MiMo-V2.5 has the lower cheapest tracked output price at $0.28/1M tokens.
- Local decision data tags 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
$6,150
Cheapest tracked route/tier: Microsoft Foundry
MiMo-V2.5
$182
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $5,968. 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.
- MiMo-V2.5 is $14.72/1M 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 $14.72/1M 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
Pricing and availability
| Pricing attribute | Grok 4 | MiMo-V2.5 |
|---|---|---|
| Input price | $3/1M tokens | $0.14/1M tokens |
| Output price | $15/1M tokens | $0.28/1M tokens |
| Providers |
Capabilities
| Capability | Grok 4 | 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 | MiMo-V2.5 |
|---|---|---|
| MMLU PRO | 87.0 | 84.9 |
| Google-Proof Q&A | 87.5 | 83.7 |
| AIME 2025 | 91.7 | 94.1 |
Deep dive
On shared benchmark coverage, MMLU PRO has Grok 4 at 87 and MiMo-V2.5 at 84.9, with Grok 4 ahead by 2.1 points; Google-Proof Q&A has Grok 4 at 87.5 and MiMo-V2.5 at 83.7, with Grok 4 ahead by 3.8 points; AIME 2025 has Grok 4 at 91.7 and MiMo-V2.5 at 94.1, with MiMo-V2.5 ahead by 2.4 points. The largest visible gap is 3.8 points on Google-Proof Q&A, 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 code execution: Grok 4. Both models share vision, multimodal input, reasoning mode, and JSON / Tool use, 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 lists $3/1M input and $15/1M output tokens on the cheapest tracked provider, while MiMo-V2.5 lists $0.14/1M input and $0.28/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts MiMo-V2.5 lower by about $6.42 per million blended tokens. Availability is 4 providers versus 2, so concentration risk also matters.
Choose Grok 4 when coding workflow support and broader provider choice are central to the workload. Choose MiMo-V2.5 when long-context analysis, larger context windows, 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 or MiMo-V2.5?
MiMo-V2.5 supports 1M tokens, while Grok 4 supports 256K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is cheaper, Grok 4 or MiMo-V2.5?
MiMo-V2.5 is cheaper on tracked token pricing. Grok 4 costs $3/1M input and $15/1M output tokens. MiMo-V2.5 costs $0.14/1M input and $0.28/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Grok 4 or MiMo-V2.5 open source?
Grok 4 is listed under Proprietary. MiMo-V2.5 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 vision, Grok 4 or MiMo-V2.5?
Both Grok 4 and MiMo-V2.5 expose vision. 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.
Which is better for multimodal input, Grok 4 or MiMo-V2.5?
Both Grok 4 and MiMo-V2.5 expose multimodal input. 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 and MiMo-V2.5?
Grok 4 is available on Microsoft Foundry, OpenRouter, Replicate API, and xAI Console. MiMo-V2.5 is available on OpenRouter and Xiaomi. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-10-20. Data sourced from public model cards and provider documentation.