Marin 8B Base vs Phi-4 Reasoning Vision 15B
Marin 8B Base (2025) and Phi-4 Reasoning Vision 15B (2026) are compact production models from Marin and Microsoft Research. Marin 8B Base ships a 4k-token context window, while Phi-4 Reasoning Vision 15B ships a not-yet-sourced context window. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads. It focuses on practical selection signals rather than broad model-family marketing.
Phi-4 Reasoning Vision 15B is safer overall; choose Marin 8B Base when provider fit matters.
Decision scorecard
Local evidence first| Signal | Marin 8B Base | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Best for | general production evaluation | multimodal apps |
| Decision fit | General | Vision |
| Context window | 4k | — |
| Cheapest output | - | - |
| Provider routes | 0 tracked | 0 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Marin 8B Base has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Phi-4 Reasoning Vision 15B uniquely exposes Vision and Multimodal in local model data.
- Local decision data tags Phi-4 Reasoning Vision 15B for Vision.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Marin 8B Base
Unavailable
No complete token price in local provider data
Phi-4 Reasoning Vision 15B
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 Marin 8B Base and Phi-4 Reasoning Vision 15B; plan for SDK, billing, or endpoint changes.
- Phi-4 Reasoning Vision 15B adds Vision and Multimodal in local capability data.
- No overlapping tracked provider route is sourced for Phi-4 Reasoning Vision 15B and Marin 8B Base; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision and Multimodal before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-05-15 | 2026-03-12 |
| Context window | 4k | — |
| Parameters | 8B | 15B |
| Architecture | decoder only | - |
| License | Apache 2.0(OSI) | MIT(OSI) |
| Openness | Open source | Open source |
| Commercial use | Commercial use allowed | Commercial use allowed |
| Knowledge cutoff | 2024-07 | 2025-03 |
Pricing and availability
| Pricing attribute | Marin 8B Base | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Input price | - | - |
| Output price | - | - |
| Providers | - | - |
Pricing not yet sourced for either model.
Capabilities
| Capability | Marin 8B Base | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | No | No |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on vision: Phi-4 Reasoning Vision 15B and multimodal input: Phi-4 Reasoning Vision 15B. 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: Marin 8B Base 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 Marin 8B Base when provider fit are central to the workload. Choose Phi-4 Reasoning Vision 15B when vision-heavy evaluation 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 Marin 8B Base or Phi-4 Reasoning Vision 15B open source?
Marin 8B Base is listed under Apache 2.0. Phi-4 Reasoning Vision 15B is listed under MIT. 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, Marin 8B Base or Phi-4 Reasoning Vision 15B?
Phi-4 Reasoning Vision 15B 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, Marin 8B Base 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.
When should I pick Marin 8B Base over Phi-4 Reasoning Vision 15B?
Phi-4 Reasoning Vision 15B is safer overall; choose Marin 8B Base when provider fit matters. If your workload also depends on provider fit, start with Marin 8B Base; if it depends on vision-heavy evaluation, run the same evaluation with Phi-4 Reasoning Vision 15B.
Continue comparing
Last reviewed: 2026-06-04. Data sourced from public model cards and provider documentation.