# Claude Mythos 5 vs Step 3.7 Flash

> Side-by-side benchmark comparison for Claude Mythos 5 and Step 3.7 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-mythos-5-vs-step-3-7-flash
- Last updated: September 4, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Claude Mythos 5 if you want the stronger benchmark profile. Step 3.7 Flash only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Mythos 5 leads overall 85 to 53.19.
- The clearest category separation is in multimodal & grounded, where the averages are 85.1 for Claude Mythos 5 and 70.9 for Step 3.7 Flash.
- The biggest single benchmark swing is Terminal-Bench 2.0 in Agentic, with scores of 88% and 59.5%.
- Step 3.7 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Claude Mythos 5 also has the larger context window at 1M+.

## Model Snapshot

| Property | Claude Mythos 5 | Step 3.7 Flash |
|----------|----------|----------|
| Creator | Anthropic | StepFun |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M+ | 256K |
| Overall Score | null | 53.19 |
| Benchmarks Covered | 15 | 11 |
| Pricing (input/output) | $10.00 / $50.00 | $0.20 / $1.15 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Step 3.7 Flash public-lane score: 46.1 (Estimated · #87/151)

| Benchmark | Claude Mythos 5 | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 88% | 59.5% | Claude Mythos 5 |
| OSWorld-Verified | 85% | Coming soon | Coming soon |
| BrowseComp | 88% | 75.8% | Claude Mythos 5 |
| CyberGym | 83.8% | Coming soon | Coming soon |
| DeepSearchQA | Coming soon | 92.8% | Coming soon |
| Toolathlon | Coming soon | 49.5% | Coming soon |
| Claw-Eval | Coming soon | 67.1% | Coming soon |
| HLE w/ tools | Coming soon | 47.2% | Coming soon |
| Gert Labs | Coming soon | 51.57% | Coming soon |

### Coding

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Step 3.7 Flash public-lane score: 49.7 (Estimated · #75/183)

| Benchmark | Claude Mythos 5 | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95.5% | Coming soon | Coming soon |
| SWE-bench Pro | 80.3% | 56.3% | Claude Mythos 5 |
| Terminal-Bench 2.0 | 88.0% | 59.5% | Claude Mythos 5 |

### Multimodal & Grounded

- Winner: Coming soon
- Claude Mythos 5 public-lane score: 85.1 (Unranked · 3 rankable rows)
- Step 3.7 Flash public-lane score: 70.9 (Unranked · 3 rankable rows)

| Benchmark | Claude Mythos 5 | Step 3.7 Flash | 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 |
| SimpleVQA | Coming soon | 79.2% | Coming soon |
| V* | Coming soon | 95.3% | Coming soon |

### Reasoning

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Step 3.7 Flash public-lane score: 71.1 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Step 3.7 Flash public-lane score: 50.3 (Estimated · #87/181)

| Benchmark | Claude Mythos 5 | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 94.1% | Coming soon | Coming soon |
| HLE | 64.5% | Coming soon | Coming soon |
| HLE w/o tools | 59% | Coming soon | Coming soon |

### Instruction Following

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Step 3.7 Flash public-lane score: 81.8 (#51/120)

### Multilingual

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Step 3.7 Flash public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE Multilingual | 92.2% | Coming soon | Coming soon |

### Mathematics

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Step 3.7 Flash public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 97.6% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Mythos 5 or Step 3.7 Flash?

Claude Mythos 5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Mythos 5 and Step 3.7 Flash?

The widest category gap is in multimodal & grounded, where the averages are 85.1 for Claude Mythos 5 and 70.9 for Step 3.7 Flash.

### How many benchmarks does Claude Mythos 5 cover on BenchLM?

Claude Mythos 5 currently has 15 sourced benchmark scores on BenchLM.

### How many benchmarks does Step 3.7 Flash cover on BenchLM?

Step 3.7 Flash currently has 11 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Mythos 5 vs Claude Mythos 5.1](/compare/claude-mythos-5-vs-claude-mythos-5-1)
- [Step 3.7 Flash vs Claude Mythos 5.1](/compare/claude-mythos-5-1-vs-step-3-7-flash)
- [Claude Mythos 5 vs Claude Mythos Preview](/compare/claude-mythos-5-vs-claude-mythos-preview)
- [Step 3.7 Flash vs Claude Mythos Preview](/compare/claude-mythos-preview-vs-step-3-7-flash)

## Explore More

- [Claude Mythos 5 profile](/models/claude-mythos-5)
- [Step 3.7 Flash profile](/models/step-3-7-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)