GPT-5.5 vs Xiaomi MiMo-V2.5-Pro
GPT-5.5 (2026) and Xiaomi MiMo-V2.5-Pro (2026) are agentic coding models from OpenAI and Xiaomi. GPT-5.5 ships a 1.1M-token context window, while Xiaomi MiMo-V2.5-Pro ships a 1M-token context window. On MMLU PRO, GPT-5.5 leads by 19.6 pts. On pricing, Xiaomi MiMo-V2.5-Pro costs $1/1M input tokens versus $5/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Xiaomi MiMo-V2.5-Pro is ~400% cheaper at $1/1M; pay for GPT-5.5 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | GPT-5.5 | Xiaomi MiMo-V2.5-Pro |
|---|---|---|
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1.1M | 1M |
| Cheapest output | $30/1M tokens | $3/1M tokens |
| Provider routes | 2 tracked | 1 tracked |
| Shared benchmarks | MMLU PRO leader | 3 rows |
Decision tradeoffs
- GPT-5.5 leads the largest shared benchmark signal on MMLU PRO by 19.6 points.
- GPT-5.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.5 has broader tracked provider coverage for fallback and procurement flexibility.
- GPT-5.5 uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags GPT-5.5 for Coding, RAG, and Agents.
- Xiaomi MiMo-V2.5-Pro has the lower cheapest tracked output price at $3/1M tokens.
- Local decision data tags Xiaomi MiMo-V2.5-Pro for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
GPT-5.5
$11,500
Cheapest tracked route: OpenAI API
Xiaomi MiMo-V2.5-Pro
$1,550
Cheapest tracked route: OpenRouter
Estimated monthly gap: $9,950. Batch, cache, 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-Pro is $27/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- GPT-5.5 is $27/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- GPT-5.5 adds Vision, Multimodal, and Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-23 | 2026-04-22 |
| Context window | 1.1M | 1M |
| Parameters | — | 1T |
| Architecture | decoder only | mixture of experts |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-12 | - |
Pricing and availability
| Pricing attribute | GPT-5.5 | Xiaomi MiMo-V2.5-Pro |
|---|---|---|
| Input price | $5/1M tokens | $1/1M tokens |
| Output price | $30/1M tokens | $3/1M tokens |
| Providers |
Capabilities
| Capability | GPT-5.5 | Xiaomi MiMo-V2.5-Pro |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | No |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
Benchmarks
| Benchmark | GPT-5.5 | Xiaomi MiMo-V2.5-Pro |
|---|---|---|
| MMLU PRO | 88.1 | 68.5 |
| SWE-bench Verified | 88.7 | 78.9 |
| Google-Proof Q&A | 93.6 | 66.7 |
Deep dive
On shared benchmark coverage, MMLU PRO has GPT-5.5 at 88.1 and Xiaomi MiMo-V2.5-Pro at 68.5, with GPT-5.5 ahead by 19.6 points; SWE-bench Verified has GPT-5.5 at 88.7 and Xiaomi MiMo-V2.5-Pro at 78.9, with GPT-5.5 ahead by 9.8 points; Google-Proof Q&A has GPT-5.5 at 93.6 and Xiaomi MiMo-V2.5-Pro at 66.7, with GPT-5.5 ahead by 26.9 points. The largest visible gap is 26.9 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 vision: GPT-5.5, multimodal input: GPT-5.5, reasoning mode: GPT-5.5, and code execution: GPT-5.5. 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, GPT-5.5 lists $5/1M input and $30/1M 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 $10.90 per million blended tokens. Availability is 2 providers versus 1, so concentration risk also matters.
Choose GPT-5.5 when coding workflow support, 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, GPT-5.5 or Xiaomi MiMo-V2.5-Pro?
GPT-5.5 supports 1.1M 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. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is cheaper, GPT-5.5 or Xiaomi MiMo-V2.5-Pro?
Xiaomi MiMo-V2.5-Pro is cheaper on tracked token pricing. GPT-5.5 costs $5/1M input and $30/1M 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 GPT-5.5 or Xiaomi MiMo-V2.5-Pro open source?
GPT-5.5 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 vision, GPT-5.5 or Xiaomi MiMo-V2.5-Pro?
GPT-5.5 has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, GPT-5.5 or Xiaomi MiMo-V2.5-Pro?
GPT-5.5 has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run GPT-5.5 and Xiaomi MiMo-V2.5-Pro?
GPT-5.5 is available on OpenAI API 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: 2026-05-11. Data sourced from public model cards and provider documentation.