Gemini 2.5 Pro vs Phi-4 Reasoning Vision 15B
Gemini 2.5 Pro (2025) and Phi-4 Reasoning Vision 15B (2026) are frontier reasoning models from Google DeepMind and Microsoft Research. Gemini 2.5 Pro ships a 1m-token context window, while Phi-4 Reasoning Vision 15B ships a not-yet-sourced context window. On Massive Multi-discipline Multimodal Understanding, Gemini 2.5 Pro leads by 27.4 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Phi-4 Reasoning Vision 15B is safer overall; choose Gemini 2.5 Pro when coding workflow support matters.
Decision scorecard
Local evidence first| Signal | Gemini 2.5 Pro | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | multimodal apps |
| Decision fit | Coding, RAG, and Agents | Vision |
| Context window | 1m | — |
| Cheapest output | $10/1M tokens | - |
| Provider routes | 4 tracked | 0 tracked |
| Shared benchmarks | Massive Multi-discipline Multimodal Understanding leader | 1 rows |
Decision tradeoffs
- Gemini 2.5 Pro holds a shared-benchmark lead on Massive Multi-discipline Multimodal Understanding, ahead by 27.4 points.
- Gemini 2.5 Pro has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 2.5 Pro has broader tracked provider coverage for fallback and procurement flexibility.
- Gemini 2.5 Pro uniquely exposes Reasoning, Function calling, and Tool use in local model data.
- Local decision data tags Gemini 2.5 Pro for Coding, RAG, and Agents.
- 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.
Gemini 2.5 Pro
$3,500
Cheapest tracked route/tier: Google AI Studio <=200K tokens
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 Gemini 2.5 Pro and Phi-4 Reasoning Vision 15B; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Reasoning, Function calling, and Tool use before moving production traffic.
- No overlapping tracked provider route is sourced for Phi-4 Reasoning Vision 15B and Gemini 2.5 Pro; plan for SDK, billing, or endpoint changes.
- Gemini 2.5 Pro adds Reasoning, Function calling, and Tool use in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-06-17 | 2026-03-12 |
| Context window | 1m | — |
| Parameters | — | 15B |
| Architecture | decoder only | - |
| License | Proprietary | MIT(OSI) |
| Openness | Proprietary | Open source |
| Commercial use | Commercial use with conditions | Commercial use allowed |
| Knowledge cutoff | 2025-01 | 2025-03 |
Pricing and availability
| Pricing attribute | Gemini 2.5 Pro | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Input price |
| - |
| Output price |
| - |
| Providers | - |
Capabilities
| Capability | Gemini 2.5 Pro | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| Function calling | Yes | No |
| Tool use | Yes | No |
| Structured outputs | Yes | No |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Gemini 2.5 Pro | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Massive Multi-discipline Multimodal Understanding | 81.7 | 54.3 |
Deep dive
On shared benchmark coverage, Massive Multi-discipline Multimodal Understanding has Gemini 2.5 Pro at 81.7 and Phi-4 Reasoning Vision 15B at 54.3, with Gemini 2.5 Pro ahead by 27.4 points. The largest visible gap is 27.4 points on Massive Multi-discipline Multimodal Understanding, 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 reasoning mode: Gemini 2.5 Pro, function calling: Gemini 2.5 Pro, tool use: Gemini 2.5 Pro, structured outputs: Gemini 2.5 Pro, and code execution: Gemini 2.5 Pro. Both models share vision and 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: Gemini 2.5 Pro has $1.25/1M input tokens and Phi-4 Reasoning Vision 15B has no token price sourced yet. Provider availability is 4 tracked routes versus 0. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Gemini 2.5 Pro when coding workflow support and broader provider choice 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.
FAQ
Is Gemini 2.5 Pro or Phi-4 Reasoning Vision 15B open source?
Gemini 2.5 Pro is listed under Proprietary. 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, Gemini 2.5 Pro or Phi-4 Reasoning Vision 15B?
Both Gemini 2.5 Pro and Phi-4 Reasoning Vision 15B expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Gemini 2.5 Pro or Phi-4 Reasoning Vision 15B?
Both Gemini 2.5 Pro and Phi-4 Reasoning Vision 15B 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, Gemini 2.5 Pro or Phi-4 Reasoning Vision 15B?
Gemini 2.5 Pro 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, Gemini 2.5 Pro or Phi-4 Reasoning Vision 15B?
Gemini 2.5 Pro 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 Gemini 2.5 Pro and Phi-4 Reasoning Vision 15B?
Gemini 2.5 Pro is available on Google AI Studio, GCP Vertex AI, OpenRouter, and Vercel AI Gateway. Phi-4 Reasoning Vision 15B is available on the tracked providers still being sourced. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-06-05. Data sourced from public model cards and provider documentation.