# Claude Mythos 5 vs GPT-4.1 nano

> Side-by-side benchmark comparison for Claude Mythos 5 and GPT-4.1 nano across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-mythos-5-vs-gpt-4-1-nano
- Last updated: September 4, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Mythos 5 and GPT-4.1 nano 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.
- GPT-4.1 nano has the lower published output-token price.

## Model Snapshot

| Property | Claude Mythos 5 | GPT-4.1 nano |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 1M+ | 1M |
| Independent public score (not head-to-head) | null | 28.43 |
| Benchmarks Covered | 15 | 4 |
| Pricing (input/output) | $10.00 / $50.00 | $0.10 / $0.40 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-4.1 nano public-lane score: 32 (Estimated · #137/151)

| Benchmark | Claude Mythos 5 | GPT-4.1 nano | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 88% | Coming soon | Coming soon |
| OSWorld-Verified | 85% | Coming soon | Coming soon |
| BrowseComp | 88% | Coming soon | Coming soon |
| CyberGym | 83.8% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-4.1 nano public-lane score: 32.3 (Estimated · #164/183)

| Benchmark | Claude Mythos 5 | GPT-4.1 nano | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95.5% | Coming soon | Coming soon |
| SWE-bench Pro | 80.3% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 88.0% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: 85.1 (Unranked · 3 rankable rows)
- GPT-4.1 nano public-lane score: 25.3 (Unranked · 1 rankable row)

| Benchmark | Claude Mythos 5 | GPT-4.1 nano | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Multimodal | 54.9% | Coming soon | Coming soon |
| CharXiv | 93.5% | Coming soon | Coming soon |
| CharXiv w/o tools | 88.9% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-4.1 nano public-lane score: 34.9 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-4.1 nano public-lane score: 30.2 (Supported · #175/181)

| Benchmark | Claude Mythos 5 | GPT-4.1 nano | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 94.1% | 50.3% | Claude Mythos 5 |
| HLE | 64.5% | Coming soon | Coming soon |
| HLE w/o tools | 59% | Coming soon | Coming soon |
| MMLU | Coming soon | 80.1% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-4.1 nano public-lane score: 36 (#106/120)

| Benchmark | Claude Mythos 5 | GPT-4.1 nano | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 83.2% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-4.1 nano public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | GPT-4.1 nano | Winner |
|-----------|-----------|-----------|--------|
| SWE Multilingual | 92.2% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-4.1 nano public-lane score: 25.6 (Unranked · 1 rankable row)

| Benchmark | Claude Mythos 5 | GPT-4.1 nano | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 97.6% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 1.034% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Mythos 5 and GPT-4.1 nano?

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 Mythos 5 vs Claude Mythos 5.1](/compare/claude-mythos-5-vs-claude-mythos-5-1)
- [GPT-4.1 nano vs Claude Mythos 5.1](/compare/claude-mythos-5-1-vs-gpt-4-1-nano)
- [Claude Mythos 5 vs Claude Mythos Preview](/compare/claude-mythos-5-vs-claude-mythos-preview)
- [GPT-4.1 nano vs Claude Mythos Preview](/compare/claude-mythos-preview-vs-gpt-4-1-nano)

## Explore More

- [Claude Mythos 5 profile](/models/claude-mythos-5)
- [GPT-4.1 nano profile](/models/gpt-4-1-nano)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)