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Claude Haiku 5.5 vs Phi 4 Reasoning Plus

Claude Haiku 5.5 leads the LLM Stats Score 50.0 to 15.0.

Anthropic · Microsoft · Updated for 2026

Which is better?

Claude Haiku 5.5 leads the overall LLM Stats Score 50.0 to 15.0, ranking #19 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Haiku 5.5

  • overall performance matters — it scores 50.0 and ranks #19 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Oct 2026

Choose Phi 4 Reasoning Plus

  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Claude Haiku 5.5
Anthropic
Phi 4 Reasoning Plus
Microsoft
Core performance indexes
LLM Stats Score
50.0
#19
15.0
#247
Reasoning
47.2
#27
15.4
#240
Coding
40.2
#13
5.6
#210
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.10 / M
— / M
Output price
$0.50 / M
— / M
Context window
1,000,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Haiku 5.5
Phi 4 Reasoning Plus
Math
25.7#110
18.3#188
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

36 reported for Claude Haiku 5.5 · 11 for Phi 4 Reasoning Plus

No common benchmarks found

Claude Haiku 5.5 and Phi 4 Reasoning Plusdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Haiku 5.5 specifies input context (1,000,000 tokens). Only Claude Haiku 5.5 specifies output context (128,000 tokens).

Anthropic
Claude Haiku 5.5
Input1,000,000 tokens
Output128,000 tokens
Microsoft
Phi 4 Reasoning Plus
Input- tokens
Output- tokens
Thu Oct 08 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Haiku 5.5 supports multimodal inputs, whereas Phi 4 Reasoning Plus does not.

Claude Haiku 5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Haiku 5.5

Text
Images
Audio
Video

Phi 4 Reasoning Plus

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Haiku 5.5 is licensed under a proprietary license, while Phi 4 Reasoning Plus uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

Claude Haiku 5.5

Proprietary

Closed source

Phi 4 Reasoning Plus

MIT

Open weights

Release Timeline

When each model was launched

Claude Haiku 5.5 was released on 2026-10-07, while Phi 4 Reasoning Plus was released on 2025-04-30.

Claude Haiku 5.5 is 18 months newer than Phi 4 Reasoning Plus.

Claude Haiku 5.5

Oct 7, 2026

1 days ago

1.4yr newer
Phi 4 Reasoning Plus

Apr 30, 2025

1.4 years ago

Knowledge Cutoff

When training data ends

Claude Haiku 5.5 has a knowledge cutoff of 2026-06-01, while Phi 4 Reasoning Plus has a cutoff of 2025-03-01.

Claude Haiku 5.5 has more recent training data (up to 2026-06-01), making it potentially better informed about events through that date compared to Phi 4 Reasoning Plus (2025-03-01).

Claude Haiku 5.5

Jun 2026

1.3 yr newer
Phi 4 Reasoning Plus

Mar 2025

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Haiku 5.5 and Phi 4 Reasoning Plus side-by-side, then vote on the output you prefer.

Claude Haiku 5.5
✓ Preferred
Phi 4 Reasoning Plus
Open in Playground

FAQ

Common questions about Claude Haiku 5.5 vs Phi 4 Reasoning Plus.

Which is better, Claude Haiku 5.5 or Phi 4 Reasoning Plus?

Claude Haiku 5.5 leads the LLM Stats Score 50.0 to 15.0. Claude Haiku 5.5 is made by Anthropic and Phi 4 Reasoning Plus is made by Microsoft. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Haiku 5.5 compare to Phi 4 Reasoning Plus in benchmarks?

Claude Haiku 5.5 scores Global-MMLU: 87.8%, MILU: 87.6%, BenchCAD (with Python tool): 87.0%, Chartography: 86.2%, SWE-bench Multilingual: 83.7%. Phi 4 Reasoning Plus scores FlenQA: 97.9%, HumanEval+: 92.3%, IFEval: 84.9%, OmniMath: 81.9%, AIME 2024: 81.3%.

What are the context window sizes for Claude Haiku 5.5 and Phi 4 Reasoning Plus?

Claude Haiku 5.5 supports 1.0M tokens and Phi 4 Reasoning Plus supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Haiku 5.5 and Phi 4 Reasoning Plus?

Key differences include LLM Stats Score (50.0 vs 15.0), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Haiku 5.5 and Phi 4 Reasoning Plus?

Claude Haiku 5.5 is developed by Anthropic and Phi 4 Reasoning Plus is developed by Microsoft.

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