# Claude Opus 5.5 vs MiniMax M3.1 Flash

> Side-by-side benchmark comparison for Claude Opus 5.5 and MiniMax M3.1 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-5-5-vs-minimax-m3-1-flash
- Last updated: October 19, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Claude Opus 5.5 leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Claude Opus 5.5 has the higher overall point estimate 86.58 to 67.05. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in agentic, where the averages are 90.3 for Claude Opus 5.5 and 63.9 for MiniMax M3.1 Flash.
- The biggest single benchmark swing is Terminal-Bench 4.0 in Agentic, with scores of 66.40% and 38.10%.
- MiniMax M3.1 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Opus 5.5 | MiniMax M3.1 Flash |
|----------|----------|----------|
| Creator | Anthropic | MiniMax |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 86.58 | 67.05 |
| Benchmarks Covered | 60 | 14 |
| Pricing (input/output) | $4.00 / $20.00 | $0.15 / $0.60 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Claude Opus 5.5 public-lane score: 90.3 (Supported · #1/130)
- MiniMax M3.1 Flash public-lane score: 63.9 (Estimated · #19/130)

| Benchmark | Claude Opus 5.5 | MiniMax M3.1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 66.40% | 38.10% | Claude Opus 5.5 |
| Terminal-Bench-Science 0.1 | 58.7% | Coming soon | Coming soon |
| AutomationBench | 40.0% | 62.2% | MiniMax M3.1 Flash |
| HLE w/ tools | 67.7% | Coming soon | Coming soon |
| OSWorld 2.0 | 48.7% | 61.7% | MiniMax M3.1 Flash |
| LAB all-pass (Harvey held-out) | 8.3% | Coming soon | Coming soon |
| LAB criterion-pass (Harvey held-out) | 91.2% | Coming soon | Coming soon |
| Toolathlon-Verified | 77.8% | Coming soon | Coming soon |
| Toolathlon Verified Pass@3 | 82.4% | Coming soon | Coming soon |
| Toolathlon Verified Pass³ | 72.2% | Coming soon | Coming soon |
| Toolathlon Verified avg. turns | 26.9 turns | Coming soon | Coming soon |
| CWE-bench v1 | 67.0% | Coming soon | Coming soon |
| Hermes Index | 63.3% | Coming soon | Coming soon |
| Hermes Bench | 76.7% | Coming soon | Coming soon |
| MazeBench | 13% | Coming soon | Coming soon |
| LOCA-Bench 256K | Coming soon | 60.3 | Coming soon |
| SWE Refactor Bench | Coming soon | 23.0 | Coming soon |
| BankerToolBench | Coming soon | 76.2% | Coming soon |
| Agents' Last Exam | Coming soon | 29.6% | Coming soon |
| CyberGym | Coming soon | 82.2% | Coming soon |

### Coding

- Winner: Claude Opus 5.5
- Claude Opus 5.5 public-lane score: 82.7 (Supported · #2/151)
- MiniMax M3.1 Flash public-lane score: 61.3 (Supported · #17/151)

| Benchmark | Claude Opus 5.5 | MiniMax M3.1 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 54.4% | Coming soon | Coming soon |
| CursorBench 4.0 | 57.8% | Coming soon | Coming soon |
| SWE-bench Pro | 89.9% | Coming soon | Coming soon |
| SWE Multilingual | 93.9% | Coming soon | Coming soon |
| SWE Multimodal | 61.4% | Coming soon | Coming soon |
| DeepSWE | 74.2% | 73.7% | Claude Opus 5.5 |
| FrontierCode 1.1 Extended | 63.6% | Coming soon | Coming soon |
| FrontierSWE v2 | 62.3% | Coming soon | Coming soon |
| ProgramBench | 91.2% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 49.3% | 39.3% | Claude Opus 5.5 |
| Bug Hunt Bench | 41.7 fixes | Coming soon | Coming soon |
| NL2Repo | Coming soon | 61.2% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 86.1 (#3/26)
- MiniMax M3.1 Flash public-lane score: 80.6 (Unranked · 2 rankable rows)

| Benchmark | Claude Opus 5.5 | MiniMax M3.1 Flash | Winner |
|-----------|-----------|-----------|--------|
| STEMBench | 2.62 | Coming soon | Coming soon |
| ARC-AGI-1 | 97.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 91.7% | Coming soon | Coming soon |
| GraphWalks BFS 256K–1M | 66.8% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Claude Opus 5.5 public-lane score: 92.2 (#3/55)
- MiniMax M3.1 Flash public-lane score: 73.5 (#30/55)

| Benchmark | Claude Opus 5.5 | MiniMax M3.1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Chartography (tools) | 89.0% | Coming soon | Coming soon |
| Chartography (no tools) | 64.4% | Coming soon | Coming soon |
| BenchCAD Vision2Code (no tools) | 0.730 | Coming soon | Coming soon |
| BenchCAD Vision2Code (tools) | 0.962 | Coming soon | Coming soon |
| Biomedical image analysis | 71.4% | Coming soon | Coming soon |
| OfficeQA | 78.9% | Coming soon | Coming soon |
| OfficeQA Pro | 67.7% | Coming soon | Coming soon |
| BabyVision w/ Python | Coming soon | 91.0% | Coming soon |
| CharXiv | Coming soon | 82.5% | Coming soon |

### Knowledge

- Winner: Claude Opus 5.5
- Claude Opus 5.5 public-lane score: 90.2 (Supported · #1/186)
- MiniMax M3.1 Flash public-lane score: 73.2 (Supported · #14/186)

| Benchmark | Claude Opus 5.5 | MiniMax M3.1 Flash | Winner |
|-----------|-----------|-----------|--------|
| HLE w/o tools | 64.4% | 43.4% | Claude Opus 5.5 |
| HealthBench (raw) | 68.1% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 60.6% | Coming soon | Coming soon |
| HealthBench Professional | 65.6% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 77.1% | Coming soon | Coming soon |
| BioMysteryBench (human-solvable) | 89.3% | Coming soon | Coming soon |
| BioMysteryBench (human-difficult) | 50.0% | Coming soon | Coming soon |
| SpatialBench Verified | 72.0% | Coming soon | Coming soon |
| SingleCellBench | 61.2% | Coming soon | Coming soon |
| Morphology-to-molecule matching | 34.0% | Coming soon | Coming soon |
| Medicinal chemistry | 63.5% | Coming soon | Coming soon |
| Protein Design | 60.2% | Coming soon | Coming soon |
| Protein Design library ranking | 56.0% | Coming soon | Coming soon |
| De novo protein-binder design | 82.6% | Coming soon | Coming soon |
| Protocols (troubleshooting) | 73.7% | Coming soon | Coming soon |
| Protocols (understanding) | 69.0% | Coming soon | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: Coming soon
- MiniMax M3.1 Flash public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | MiniMax M3.1 Flash | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 94.3% | Coming soon | Coming soon |
| MILU | 93.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: Coming soon
- MiniMax M3.1 Flash public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | MiniMax M3.1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 1.0% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 97.3 (Unranked · 4 rankable rows)
- MiniMax M3.1 Flash public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | MiniMax M3.1 Flash | Winner |
|-----------|-----------|-----------|--------|
| ArXivMath Aug. 2026 (no tools) | 91.2% | Coming soon | Coming soon |
| ArXivMath Aug. 2026 (tools) | 96.9% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 91.228% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 95.000% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Opus 5.5 or MiniMax M3.1 Flash?

Claude Opus 5.5 has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Claude Opus 5.5 and MiniMax M3.1 Flash?

The widest category gap is in agentic, where the averages are 90.3 for Claude Opus 5.5 and 63.9 for MiniMax M3.1 Flash.

### How many benchmarks does Claude Opus 5.5 cover on BenchLM?

Claude Opus 5.5 currently has 60 sourced benchmark scores on BenchLM.

### How many benchmarks does MiniMax M3.1 Flash cover on BenchLM?

MiniMax M3.1 Flash currently has 14 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 5.5 vs MiniMax M3.1 Flash Preview](/compare/claude-opus-5-5-vs-minimax-m3-1-flash-preview)
- [MiniMax M3.1 Flash vs MiniMax M3.1 Flash Preview](/compare/minimax-m3-1-flash-vs-minimax-m3-1-flash-preview)
- [Claude Opus 5.5 vs GPT-6.1 Sol](/compare/claude-opus-5-5-vs-gpt-6-1-sol)
- [MiniMax M3.1 Flash vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-minimax-m3-1-flash)

## Explore More

- [Claude Opus 5.5 profile](/models/claude-opus-5-5)
- [MiniMax M3.1 Flash profile](/models/minimax-m3-1-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)