GPT-4o (11-20) vs Phi-4 Reasoning Vision 15B
GPT-4o (11-20) (2024) and Phi-4 Reasoning Vision 15B (2026) are compact production models from OpenAI and Microsoft Research. GPT-4o (11-20) ships a 128K-token context window, while Phi-4 Reasoning Vision 15B ships a not-yet-sourced context window. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing. The goal is to make the tradeoff clear before deeper testing.
Phi-4 Reasoning Vision 15B is safer overall; choose GPT-4o (11-20) when coding workflow support matters.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-11-20 | 2026-03-12 |
| Context window | 128K | — |
| Parameters | 1.76T (8x222B MoE)* | 15B |
| Architecture | mixture of experts | - |
| License | Proprietary | Microsoft Research |
| Knowledge cutoff | 2023-10 | - |
Pricing and availability
| Pricing attribute | GPT-4o (11-20) | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Input price | - | - |
| Output price | - | - |
| Providers | - | - |
Pricing not yet sourced for either model.
Capabilities
| Capability | GPT-4o (11-20) | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Vision | Yes | No |
| Multimodal | No | Yes |
| Reasoning | No | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | No | No |
| Code execution | Yes | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on vision: GPT-4o (11-20), multimodal input: Phi-4 Reasoning Vision 15B, and code execution: GPT-4o (11-20). Both models share the core language-model surface, 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-4o (11-20) has no token price sourced yet and Phi-4 Reasoning Vision 15B has no token price sourced yet. Provider availability is 0 tracked routes versus 0. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose GPT-4o (11-20) when coding workflow support are central to the workload. Choose Phi-4 Reasoning Vision 15B 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. For teams standardizing a stack, that distinction is often the difference between a benchmark win and a reliable deployment.
FAQ
Is GPT-4o (11-20) or Phi-4 Reasoning Vision 15B open source?
GPT-4o (11-20) is listed under Proprietary. Phi-4 Reasoning Vision 15B is listed under Microsoft Research. 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-4o (11-20) or Phi-4 Reasoning Vision 15B?
GPT-4o (11-20) 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-4o (11-20) or Phi-4 Reasoning Vision 15B?
Phi-4 Reasoning Vision 15B 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.
Which is better for code execution, GPT-4o (11-20) or Phi-4 Reasoning Vision 15B?
GPT-4o (11-20) has the clearer documented code execution signal in this comparison. If code execution is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
When should I pick GPT-4o (11-20) over Phi-4 Reasoning Vision 15B?
Phi-4 Reasoning Vision 15B is safer overall; choose GPT-4o (11-20) when coding workflow support matters. If your workload also depends on coding workflow support, start with GPT-4o (11-20); if it depends on provider fit, run the same evaluation with Phi-4 Reasoning Vision 15B.
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Last reviewed: 2026-04-19. Data sourced from public model cards and provider documentation.