# Claude Mythos 5.2 vs DeepSeek V4.1 Flash 1017

> Side-by-side benchmark comparison for Claude Mythos 5.2 and DeepSeek V4.1 Flash 1017 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-mythos-5-2-vs-deepseek-v4-1-flash
- Last updated: November 10, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Mythos 5.2 and DeepSeek V4.1 Flash 1017 share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- DeepSeek V4.1 Flash 1017 has the lower published output-token price.

## Model Snapshot

| Property | Claude Mythos 5.2 | DeepSeek V4.1 Flash 1017 |
|----------|----------|----------|
| Creator | Anthropic | DeepSeek |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Independent public score (not head-to-head) | null | 65.13 |
| Benchmarks Covered | 14 | 37 |
| Pricing (input/output) | $8.00 / $40.00 | $0.30 / $1.20 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Mythos 5.2 public-lane score: Coming soon
- DeepSeek V4.1 Flash 1017 public-lane score: 61.8 (Supported · #22/132)

| Benchmark | Claude Mythos 5.2 | DeepSeek V4.1 Flash 1017 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 70.50% | 42.30% | Claude Mythos 5.2 |
| Terminal-Bench-Science 0.1 | 75.3% | Coming soon | Coming soon |
| CVE Rediscovery | 89.6% | Coming soon | Coming soon |
| ExploitGym | 38.1% | 15.3% | Claude Mythos 5.2 |
| Binary Exploitation Benchmark | 148 | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 90.6% | Coming soon |
| terminalBench3 | Coming soon | 30% | Coming soon |
| CyberGym | Coming soon | 88.1% | Coming soon |
| HLE w/ tools | Coming soon | 63.9% | Coming soon |
| AutomationBench | Coming soon | 60.5% | Coming soon |
| Agents' Last Exam | Coming soon | 35.4% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 74.5% | Coming soon |
| CWE-bench v1 | Coming soon | 55.0% | Coming soon |
| MazeBench | Coming soon | 1% | Coming soon |
| CWE-bench | Coming soon | 57.6% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Mythos 5.2 public-lane score: Coming soon
- DeepSeek V4.1 Flash 1017 public-lane score: 63.1 (Supported · #15/158)

| Benchmark | Claude Mythos 5.2 | DeepSeek V4.1 Flash 1017 | Winner |
|-----------|-----------|-----------|--------|
| ScarfBench | Coming soon | 69.0% | Coming soon |
| Codeforces | Coming soon | 3471.0 | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 90.6% | Coming soon |
| terminalBench3 | Coming soon | 30% | Coming soon |
| DeepSWE | Coming soon | 77.0% | Coming soon |
| ProgramBench | Coming soon | 29.1% | Coming soon |
| NL2Repo | Coming soon | 68.2% | Coming soon |
| OpenHarmony Bench | Coming soon | 60.3% | Coming soon |
| Bug Hunt Bench | Coming soon | 39.1 fixes | Coming soon |
| FrontierCode 2.0 | Coming soon | 19.3% | Coming soon |
| CursorBench 4.0 | Coming soon | 47.7% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Mythos 5.2 public-lane score: Coming soon
- DeepSeek V4.1 Flash 1017 public-lane score: 58.7 (Estimated · #35/158)

| Benchmark | Claude Mythos 5.2 | DeepSeek V4.1 Flash 1017 | Winner |
|-----------|-----------|-----------|--------|
| STEMBench | Coming soon | 2.54 | Coming soon |
| JevBench 1.4 | Coming soon | 4.77 | Coming soon |
| JevBench 1.5 | Coming soon | 6.65 | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Mythos 5.2 public-lane score: Coming soon
- DeepSeek V4.1 Flash 1017 public-lane score: 63.9 (Supported · #28/67)

| Benchmark | Claude Mythos 5.2 | DeepSeek V4.1 Flash 1017 | Winner |
|-----------|-----------|-----------|--------|
| Biomedical image analysis | 80.7% | Coming soon | Coming soon |
| ExtractBench (LlamaIndex) | Coming soon | 87.11% | Coming soon |
| ParseBench | Coming soon | 64.38% | Coming soon |
| Chartography (tools) | Coming soon | 83.0% | Coming soon |
| BabyVision w/ Python | Coming soon | 92.5% | Coming soon |
| ZeroBench w/ Python | Coming soon | 51.0% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude Mythos 5.2 public-lane score: Coming soon
- DeepSeek V4.1 Flash 1017 public-lane score: 63.7 (Supported · #35/179)

| Benchmark | Claude Mythos 5.2 | DeepSeek V4.1 Flash 1017 | Winner |
|-----------|-----------|-----------|--------|
| De novo protein-binder design | 85.1% | Coming soon | Coming soon |
| Protein Design | 64.6% | Coming soon | Coming soon |
| SingleCellBench | 65.6% | Coming soon | Coming soon |
| Protocols (troubleshooting) | 77.1% | Coming soon | Coming soon |
| Protein Domain ID | 91.8% | Coming soon | Coming soon |
| Protein Mutation Attribution | 51.5% | Coming soon | Coming soon |
| Morphology-to-molecule matching | 35.2% | Coming soon | Coming soon |
| Medicinal chemistry | 69.0% | Coming soon | Coming soon |
| GPQA | Coming soon | 90.9% | Coming soon |
| GPQA-D | Coming soon | 90.9% | Coming soon |
| HLE | Coming soon | 42.6% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude Mythos 5.2 public-lane score: Coming soon
- DeepSeek V4.1 Flash 1017 public-lane score: 65.6 (Unranked · 3 rankable rows)

| Benchmark | Claude Mythos 5.2 | DeepSeek V4.1 Flash 1017 | Winner |
|-----------|-----------|-----------|--------|
| Apex | Coming soon | 65.6% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 67.368% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 26.829% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Mythos 5.2 and DeepSeek V4.1 Flash 1017?

Not yet. The models share only 2 sourced benchmark rows, 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 Mythos 5.2 vs Claude Mythos 5](/compare/claude-mythos-5-vs-claude-mythos-5-2)
- [DeepSeek V4.1 Flash 1017 vs Claude Mythos 5](/compare/claude-mythos-5-vs-deepseek-v4-1-flash)
- [Claude Mythos 5.2 vs Claude Mythos 5.1](/compare/claude-mythos-5-1-vs-claude-mythos-5-2)
- [DeepSeek V4.1 Flash 1017 vs Claude Mythos 5.1](/compare/claude-mythos-5-1-vs-deepseek-v4-1-flash)

## Explore More

- [Claude Mythos 5.2 profile](/models/claude-mythos-5-2)
- [DeepSeek V4.1 Flash 1017 profile](/models/deepseek-v4-1-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)