# Claude Opus 5.5 vs Phi 3 Mini 4k Instruct

> Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 27.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-5-5-vs-phi-3-mini-4k-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 11

## Summary

- They share 11 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and Phi 3 Mini 4k Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 5.5 leads 92.4 to 24.5.
- Phi 3 Mini 4k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| Provider | Anthropic | Microsoft |
| Noometry Index | 68.5 | 27.4 |
| Rank | 3 | 324 |
| Context | 1M | — |
| Input $/M | $4 | — |
| Output $/M | $20 | — |
| Weights | Proprietary | Open |

## Coding

- Claude Opus 5.5: 71.4 (#1)
- Phi 3 Mini 4k Instruct: 26.1 (#319)

| Benchmark | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Coding | 1545 | 1093 |
| FrontierCode | 54.4% | — |
| CursorBench | 57.8% | — |
| LMArena WebDev | 1820 | — |
| FrontierSWE | 62.3% | — |
| SciCode | 66.9% | — |
| LiveBench Coding | — | 15.5% |
| MirrorCode | 77.4% | — |
| HumanEval+ | — | 59.1% |
| MBPP+ | — | 54.2% |

## Agentic & Tool Use

- Claude Opus 5.5: 45.3 (#13)
- Phi 3 Mini 4k Instruct: —

| Benchmark | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| APEX-Agents | 73.5% | — |
| GDP.pdf | 30.6% | — |

## Reasoning

- Claude Opus 5.5: 79.5 (#2)
- Phi 3 Mini 4k Instruct: 13.6 (#326)

| Benchmark | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1545 | 1072 |
| ARC-AGI-2 | 92.5% | — |
| NYT Connections (extended) | 88.5% | — |
| ARC-AGI-1 | 97.5% | — |
| CritPt | 31.7% | — |
| Chess Puzzles | — | 0% |
| EBR-Bench | 71.4% | — |
| LiveBench Reasoning | — | 26.8% |
| Mystery Game Puzzles | 71% | — |
| DTBench | 98.9% | — |
| LiveBench Data Analysis | — | 34.7% |
| LMCA | 68.2% | — |
| Adversarial NLI | — | 52.8% |
| BIG-Bench Hard | — | 71.7% |
| HellaSwag | — | 76.7% |
| LiveBench | — | 22.4% |
| WinoGrande | — | 70.8% |

## Math

- Claude Opus 5.5: 92.4 (#2)
- Phi 3 Mini 4k Instruct: 24.5 (#258)

| Benchmark | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LiveBench Math | — | 15.7% |
| LMArena Math | — | 1111 |

## Knowledge

- Claude Opus 5.5: 66.6 (#9)
- Phi 3 Mini 4k Instruct: 27.9 (#241)

| Benchmark | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Expert | 1564 | 1045 |
| GPQA Diamond | 90.6% | — |
| SimpleQA Verified | 72.2% | — |
| ARC (AI2) Challenge | — | 84.9% |
| MMLU | — | 68.8% |
| OpenBookQA | — | 88% |
| TriviaQA | — | 64% |

## Multimodal

- Claude Opus 5.5: 56.5 (#2)
- Phi 3 Mini 4k Instruct: —

| Benchmark | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| Furniture Assembly | 83.3% | — |

## Multilingual

- Claude Opus 5.5: 59.8 (#1)
- Phi 3 Mini 4k Instruct: 26.5 (#275)

| Benchmark | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Non-English | 1513 | 1021 |
| LMArena Chinese | 1572 | 1021 |
| LMArena Russian | 1532 | 1022 |
| LMArena French | — | 1075 |
| LMArena German | — | 1044 |
| LMArena Japanese | — | 935 |
| LMArena Korean | — | 905 |
| LMArena Spanish | — | 1084 |

## Instruction Following

- Claude Opus 5.5: 80.1 (#2)
- Phi 3 Mini 4k Instruct: 48.0 (#298)

| Benchmark | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Instruction Following | 1535 | 1053 |
| LiveBench Instruction Following | — | 39.1% |

## Long Context

- Claude Opus 5.5: 47.3 (#18)
- Phi 3 Mini 4k Instruct: 31.7 (#271)

| Benchmark | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Longer Query | 1540 | 1044 |

## Writing & Preference

- Claude Opus 5.5: 78.7 (#3)
- Phi 3 Mini 4k Instruct: 27.7 (#295)

| Benchmark | Claude Opus 5.5 | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Text | 1518 | 1073 |
| LMArena Creative Writing | 1538 | 1037 |
| LMArena Multi-Turn | 1520 | 1018 |
| EQ-Bench Creative Writing | 2050 | — |
| LiveBench Language | — | 9.2% |

## FAQ

### Is Claude Opus 5.5 better than Phi 3 Mini 4k Instruct?

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 27.4 on the Noometry Index.

### Is Claude Opus 5.5 or Phi 3 Mini 4k Instruct better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 26.1 in the Noometry coding category.

### How many benchmarks do Claude Opus 5.5 and Phi 3 Mini 4k Instruct share?

11 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Phi 3 Mini 4k Instruct has 35.