Model comparison
Claude Opus 5.5 vs Phi 3 Small 8k Instruct
Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 29.3 on the Noometry Index.
Last verified . 14 shared benchmarks.
MicrosoftSummary
- They share 14 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and Phi 3 Small 8k Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 14.8.
- Phi 3 Small 8k Instruct has downloadable open weights; the other is API-only.
Side by side
| Claude Opus 5.5 | Phi 3 Small 8k Instruct | |
|---|---|---|
| Provider | Anthropic | Microsoft |
| Noometry Index | 68.6 | 29.3 |
| Released | 2026-09-22 | 2024-04-23 |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $4 | — |
| Output $ / M tokens | $20 | — |
| Results tracked | 44 | 32 |
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Category by category
Coding Claude Opus 5.5 leads
Claude Opus 5.5: 71.9 (#3), Phi 3 Small 8k Instruct: 27.9 (#318)
| Benchmark | Claude Opus 5.5 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Coding | 1547 | 1101 |
| FrontierCode | 54.6% | — |
| CursorBench | 57.8% | — |
| LMArena WebDev | 1813 | — |
| FrontierSWE | 62.3% | — |
| SciCode | 66.9% | — |
| LiveBench Coding | — | 20.3% |
| MirrorCode | 77.4% | — |
| ALE-Bench | 2,147 | — |
Agentic & Tool Use Not comparable
Claude Opus 5.5: 45.3 (#15), Phi 3 Small 8k Instruct: —
| Benchmark | Claude Opus 5.5 | Phi 3 Small 8k Instruct |
|---|---|---|
| APEX-Agents | 73.5% | — |
| GDP.pdf | 30.6% | — |
| Vending-Bench 2 | 9,235 | — |
Reasoning Claude Opus 5.5 leads
Claude Opus 5.5: 80.2 (#3), Phi 3 Small 8k Instruct: 14.8 (#323)
| Benchmark | Claude Opus 5.5 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1535 | 1100 |
| ARC-AGI-2 | 93.3% | — |
| NYT Connections (extended) | 88.5% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 31.7% | — |
| EBR-Bench | 71.4% | — |
| LiveBench Reasoning | — | 15.9% |
| Mystery Game Puzzles | 71% | — |
| DTBench | 98.9% | — |
| LiveBench Data Analysis | — | 30.3% |
| LMCA | 68.2% | — |
| Adversarial NLI | — | 58.1% |
| BIG-Bench Hard | — | 79.1% |
| Epoch Capabilities Index | 167.33 | — |
| HellaSwag | — | 77% |
| LiveBench | — | 24% |
| WinoGrande | — | 81.5% |
Math Claude Opus 5.5 leads
Claude Opus 5.5: 91.8 (#3), Phi 3 Small 8k Instruct: 27.6 (#248)
| Benchmark | Claude Opus 5.5 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Math | 1506 | 1151 |
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LiveBench Math | — | 17.6% |
| FrontierMath Erdős | 2.9% | — |
Knowledge Claude Opus 5.5 leads
Claude Opus 5.5: 66.4 (#10), Phi 3 Small 8k Instruct: 29.1 (#240)
| Benchmark | Claude Opus 5.5 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Expert | 1547 | 1067 |
| GPQA Diamond | 90.6% | — |
| SimpleQA Verified | 72.2% | — |
| ARC (AI2) Challenge | — | 90.7% |
| MMLU | — | 75.7% |
| OpenBookQA | — | 88% |
| TriviaQA | — | 58.1% |
Multimodal Not comparable
Claude Opus 5.5: 57.8 (#1), Phi 3 Small 8k Instruct: —
| Benchmark | Claude Opus 5.5 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Vision | 1321 | — |
| Blueprint-Bench 2 | 51.2% | — |
| Furniture Assembly | 83.3% | — |
Multilingual Claude Opus 5.5 leads
Claude Opus 5.5: 59.1 (#2), Phi 3 Small 8k Instruct: 28.5 (#272)
| Benchmark | Claude Opus 5.5 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Non-English | 1507 | 1058 |
| LMArena Chinese | 1588 | 1061 |
| LMArena French | 1514 | 1135 |
| LMArena Russian | 1520 | 1111 |
| LMArena Spanish | 1507 | 1111 |
| LMArena German | — | 1080 |
| LMArena Japanese | — | 966 |
| LMArena Korean | — | 894 |
Instruction Following Claude Opus 5.5 leads
Claude Opus 5.5: 80.0 (#3), Phi 3 Small 8k Instruct: 51.9 (#292)
| Benchmark | Claude Opus 5.5 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Instruction Following | 1537 | 1087 |
| LiveBench Instruction Following | — | 47.2% |
Long Context Claude Opus 5.5 leads
Claude Opus 5.5: 47.1 (#19), Phi 3 Small 8k Instruct: 33.0 (#267)
| Benchmark | Claude Opus 5.5 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Longer Query | 1532 | 1088 |
Writing & Preference Claude Opus 5.5 leads
Claude Opus 5.5: 78.2 (#3), Phi 3 Small 8k Instruct: 31.1 (#284)
| Benchmark | Claude Opus 5.5 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Text | 1515 | 1110 |
| LMArena Creative Writing | 1533 | 1083 |
| LMArena Multi-Turn | 1499 | 1068 |
| EQ-Bench Creative Writing | 2050 | — |
| LiveBench Language | — | 12.9% |
Frequently asked questions
Is Claude Opus 5.5 better than Phi 3 Small 8k Instruct?
Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 29.3 on the Noometry Index.
Is Claude Opus 5.5 or Phi 3 Small 8k Instruct better for coding?
Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 27.9 in the Noometry coding category.
How many benchmarks do Claude Opus 5.5 and Phi 3 Small 8k Instruct share?
14 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Phi 3 Small 8k Instruct has 32.