Claude 3.5 Haiku vs Phi-4 Reasoning Vision 15B
Claude 3.5 Haiku (2024) and Phi-4 Reasoning Vision 15B (2026) are frontier reasoning models from Anthropic and Microsoft Research. Claude 3.5 Haiku ships a 200k-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.
Phi-4 Reasoning Vision 15B is safer overall; choose Claude 3.5 Haiku when coding workflow support matters.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-10-22 | 2026-03-12 |
| Context window | 200k | — |
| Parameters | — | 15B |
| Architecture | decoder only | - |
| License | Unknown | Microsoft Research |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Claude 3.5 Haiku | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Input price | $0.8/1M tokens | - |
| Output price | $4/1M tokens | - |
| Providers | - |
Capabilities
| Capability | Claude 3.5 Haiku | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Vision | Yes | No |
| Multimodal | No | Yes |
| Reasoning | Yes | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | Yes | 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: Claude 3.5 Haiku, multimodal input: Phi-4 Reasoning Vision 15B, reasoning mode: Claude 3.5 Haiku, structured outputs: Claude 3.5 Haiku, and code execution: Claude 3.5 Haiku. 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: Claude 3.5 Haiku has $0.8/1M input tokens and Phi-4 Reasoning Vision 15B has no token price sourced yet. Provider availability is 5 tracked routes versus 0. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Claude 3.5 Haiku when coding workflow support and broader provider choice 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.
FAQ
Is Claude 3.5 Haiku or Phi-4 Reasoning Vision 15B open source?
Claude 3.5 Haiku is listed under Unknown. 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, Claude 3.5 Haiku or Phi-4 Reasoning Vision 15B?
Claude 3.5 Haiku 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, Claude 3.5 Haiku 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 reasoning mode, Claude 3.5 Haiku or Phi-4 Reasoning Vision 15B?
Claude 3.5 Haiku 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 structured outputs, Claude 3.5 Haiku or Phi-4 Reasoning Vision 15B?
Claude 3.5 Haiku has the clearer documented structured outputs signal in this comparison. If structured outputs is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Claude 3.5 Haiku and Phi-4 Reasoning Vision 15B?
Claude 3.5 Haiku is available on Anthropic, OpenRouter, AWS Bedrock, GCP Vertex AI, and Replicate API. 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.
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Last reviewed: 2026-05-11. Data sourced from public model cards and provider documentation.