# Claude Opus 4.8 vs Phi-4-reasoning

> Side-by-side benchmark comparison for Claude Opus 4.8 and Phi-4-reasoning across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-8-vs-phi-4-reasoning
- Last updated: October 14, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Opus 4.8 and Phi-4-reasoning share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Claude Opus 4.8 has the larger published context window at 1M.

## Model Snapshot

| Property | Claude Opus 4.8 | Phi-4-reasoning |
|----------|----------|----------|
| Creator | Anthropic | Microsoft |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 32K |
| Independent public score (not head-to-head) | 70.14 | null |
| Benchmarks Covered | 40 | 6 |
| Pricing (input/output) | $5.00 / $25.00 | N/A |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 64.1 (Supported · #19/124)
- Phi-4-reasoning public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Phi-4-reasoning | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 21.1% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 74.6% | Coming soon | Coming soon |
| BrowseComp | 84.3% | Coming soon | Coming soon |
| DeepSearchQA | 93.1% | Coming soon | Coming soon |
| OSWorld-Verified | 83.4% | Coming soon | Coming soon |
| Finance Agent v2 | 53.9% | Coming soon | Coming soon |
| MCP Atlas | 82.2% | Coming soon | Coming soon |
| Toolathlon | 59.9% | Coming soon | Coming soon |
| Gert Labs | 72.97% | Coming soon | Coming soon |
| ResearchClawBench | 21.1% | Coming soon | Coming soon |
| OSWorld 2.0 | 20.6% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 71.9% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 60.8 (Supported · #17/148)
- Phi-4-reasoning public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Phi-4-reasoning | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 88.6% | Coming soon | Coming soon |
| SWE-bench Pro | 69.2% | Coming soon | Coming soon |
| SWE Multilingual | 84.4% | Coming soon | Coming soon |
| SWE Multimodal | 38.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 74.6% | Coming soon | Coming soon |
| cursorBench31 | 58.4% | Coming soon | Coming soon |
| CursorBench 3.2 | 62.3% | Coming soon | Coming soon |
| FrontierCode 1.1 Main | 46.5% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.8% | Coming soon | Coming soon |
| SWE-bench (Vals) | 88.6% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 32.9% | Coming soon | Coming soon |
| LiveCodeBench | Coming soon | 53.8% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 62.8 (#25/29)
- Phi-4-reasoning public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Phi-4-reasoning | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 72.1% | Coming soon | Coming soon |
| ARC-AGI-3 | 1.5% | Coming soon | Coming soon |
| ARC-AGI-1 | 92.50% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 91.2 (#5/54)
- Phi-4-reasoning public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Phi-4-reasoning | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 66.2% | Coming soon | Coming soon |
| ScreenSpot Pro | 87.9% | Coming soon | Coming soon |
| CharXiv | 89.9% | Coming soon | Coming soon |
| CharXiv w/o tools | 80.5% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 71.8 (Supported · #15/181)
- Phi-4-reasoning public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Phi-4-reasoning | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | 65.8% | Claude Opus 4.8 |
| GPQA-D | 93.6% | Coming soon | Coming soon |
| HLE | 57.9% | Coming soon | Coming soon |
| HLE w/o tools | 49.8% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 92.4% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 89.6% | Coming soon | Coming soon |
| MMLU-Pro | Coming soon | 74.3% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: Coming soon
- Phi-4-reasoning public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Phi-4-reasoning | Winner |
|-----------|-----------|-----------|--------|
| INCLUDE | 87.6% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 75.4 (#62/128)
- Phi-4-reasoning public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Phi-4-reasoning | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 83.4% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 84.4 (#1/12)
- Phi-4-reasoning public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Phi-4-reasoning | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 96.7% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 80.000% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 56.098% | Coming soon | Coming soon |
| AIME 2024 | Coming soon | 75.3% | Coming soon |
| AIME 2025 | Coming soon | 62.9% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Opus 4.8 and Phi-4-reasoning?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Claude Opus 4.8 vs Phi-4-reasoning-plus](/compare/claude-opus-4-8-vs-phi-4-reasoning-plus)
- [Phi-4-reasoning vs Phi-4-reasoning-plus](/compare/phi-4-reasoning-vs-phi-4-reasoning-plus)
- [Claude Opus 4.8 vs Claude Opus 5.5](/compare/claude-opus-4-8-vs-claude-opus-5-5)
- [Phi-4-reasoning vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-phi-4-reasoning)

## Explore More

- [Claude Opus 4.8 profile](/models/claude-opus-4-8)
- [Phi-4-reasoning profile](/models/phi-4-reasoning)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)