GPT-5.1 Codex Max vs Xiaomi MiMo-V2.5-TTS-Series
GPT-5.1 Codex Max (2025) and Xiaomi MiMo-V2.5-TTS-Series (2026) compare a coding-specialized model against a standalone API model. GPT-5.1 Codex Max ships a not-yet-sourced context window, while Xiaomi MiMo-V2.5-TTS-Series ships a not-yet-sourced context window. This page treats the result as workflow and deployment fit, not a universal model winner.
Treat this as a product-type comparison: GPT-5.1 Codex Max is coding-specialized model, while Xiaomi MiMo-V2.5-TTS-Series is standalone API model. Choose based on workflow fit before reading any benchmark or price row as decisive.
Decision scorecard
Local evidence first| Signal | GPT-5.1 Codex Max | Xiaomi MiMo-V2.5-TTS-Series |
|---|---|---|
| Product type | Coding-specialized model | Standalone API model |
| Best for | custom coding agents, code generation, and tool loops | multimodal apps |
| Decision fit | Coding, Agents, and Vision | Vision |
| Context window | — | — |
| Cheapest output | $10/1M tokens | - |
| Provider routes | 2 tracked | 1 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- GPT-5.1 Codex Max has broader tracked provider coverage for fallback and procurement flexibility.
- GPT-5.1 Codex Max uniquely exposes Vision, Reasoning, and Function calling in local model data.
- Local decision data tags GPT-5.1 Codex Max for Coding, Agents, and Vision.
- Local decision data tags Xiaomi MiMo-V2.5-TTS-Series for Vision.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
GPT-5.1 Codex Max
$3,500
Cheapest tracked route/tier: OpenRouter
Xiaomi MiMo-V2.5-TTS-Series
Unavailable
No complete token price in local provider data
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for GPT-5.1 Codex Max and Xiaomi MiMo-V2.5-TTS-Series; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision, Reasoning, and Function calling before moving production traffic.
- No overlapping tracked provider route is sourced for Xiaomi MiMo-V2.5-TTS-Series and GPT-5.1 Codex Max; plan for SDK, billing, or endpoint changes.
- GPT-5.1 Codex Max adds Vision, Reasoning, and Function calling in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-11-19 | 2026-04-23 |
| Context window | — | — |
| Parameters | — | — |
| Architecture | - | - |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2024-09 | - |
Pricing and availability
| Pricing attribute | GPT-5.1 Codex Max | Xiaomi MiMo-V2.5-TTS-Series |
|---|---|---|
| Input price | $1.25/1M tokens | - |
| Output price | $10/1M tokens | - |
| Providers |
Capabilities
| Capability | GPT-5.1 Codex Max | Xiaomi MiMo-V2.5-TTS-Series |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| Function calling | Yes | No |
| Tool use | Yes | No |
| Structured outputs | Yes | No |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
Deep dive
The capability footprint differs most on vision: GPT-5.1 Codex Max, reasoning mode: GPT-5.1 Codex Max, function calling: GPT-5.1 Codex Max, tool use: GPT-5.1 Codex Max, and structured outputs: GPT-5.1 Codex Max. Both models share multimodal input, 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.
Pricing coverage is uneven: GPT-5.1 Codex Max has $1.25/1M input tokens and Xiaomi MiMo-V2.5-TTS-Series has no token price sourced yet. Provider availability is 2 tracked routes versus 1. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose GPT-5.1 Codex Max when coding workflow support and broader provider choice are central to the workload. Choose Xiaomi MiMo-V2.5-TTS-Series when provider fit are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Is GPT-5.1 Codex Max or Xiaomi MiMo-V2.5-TTS-Series open source?
GPT-5.1 Codex Max is listed under Proprietary. Xiaomi MiMo-V2.5-TTS-Series 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-5.1 Codex Max or Xiaomi MiMo-V2.5-TTS-Series?
GPT-5.1 Codex Max 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.
Which is better for multimodal input, GPT-5.1 Codex Max or Xiaomi MiMo-V2.5-TTS-Series?
Both GPT-5.1 Codex Max and Xiaomi MiMo-V2.5-TTS-Series expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for reasoning mode, GPT-5.1 Codex Max or Xiaomi MiMo-V2.5-TTS-Series?
GPT-5.1 Codex Max 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, GPT-5.1 Codex Max or Xiaomi MiMo-V2.5-TTS-Series?
GPT-5.1 Codex Max has the clearer documented function calling signal in this comparison. If function calling is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run GPT-5.1 Codex Max and Xiaomi MiMo-V2.5-TTS-Series?
GPT-5.1 Codex Max is available on OpenRouter and Vercel AI Gateway. Xiaomi MiMo-V2.5-TTS-Series is available on Xiaomi. 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: 2026-06-15. Data sourced from public model cards and provider documentation.