# Claude Mythos 5 vs GPT-6.1 Terra

> Side-by-side benchmark comparison for Claude Mythos 5 and GPT-6.1 Terra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-mythos-5-vs-gpt-6-1-terra
- Last updated: October 26, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Claude Mythos 5 and GPT-6.1 Terra.

## Summary

- Claude Mythos 5 and GPT-6.1 Terra do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | Claude Mythos 5 | GPT-6.1 Terra |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M+ | 1.05M |
| Independent public score (not head-to-head) | null | 75.87 |
| Benchmarks Covered | 15 | 10 |
| Pricing (input/output) | $10.00 / $50.00 | $1.00 / $5.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-6.1 Terra public-lane score: 72.4 (Estimated · #8/133)

| Benchmark | Claude Mythos 5 | GPT-6.1 Terra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.0% | Coming soon | Coming soon |
| OSWorld-Verified | 85% | Coming soon | Coming soon |
| BrowseComp | 88% | Coming soon | Coming soon |
| CyberGym | 83.8% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 50.30% | Coming soon |
| Terminal-Bench-Science 0.1 | Coming soon | 58.3% | Coming soon |
| Agents' Last Exam | Coming soon | 60.0% | Coming soon |
| OSWorld 2.1 Offline | Coming soon | 74.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-6.1 Terra public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | GPT-6.1 Terra | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95.5% | Coming soon | Coming soon |
| SWE-bench Pro | 80.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 88.0% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-6.1 Terra public-lane score: 81.8 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: 91.1 (Unranked · 3 rankable rows)
- GPT-6.1 Terra public-lane score: 91.6 (#4/58)

| Benchmark | Claude Mythos 5 | GPT-6.1 Terra | 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 |
| MMMU-Pro | Coming soon | 85.5% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-6.1 Terra public-lane score: 74.9 (Supported · #12/188)

| Benchmark | Claude Mythos 5 | GPT-6.1 Terra | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 94.1% | Coming soon | Coming soon |
| HLE | 64.5% | Coming soon | Coming soon |
| HLE w/o tools | 59% | Coming soon | Coming soon |
| HealthBench (raw) | Coming soon | 51.1% | Coming soon |
| HealthBench (length-adjusted) | Coming soon | 55.1% | Coming soon |
| HealthBench Professional | Coming soon | 62.7% | Coming soon |
| HealthBench Professional (raw) | Coming soon | 64.2% | Coming soon |
| HealthBench Hard | Coming soon | 31.4% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-6.1 Terra public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | GPT-6.1 Terra | Winner |
|-----------|-----------|-----------|--------|
| SWE Multilingual | 92.2% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude Mythos 5 public-lane score: Coming soon
- GPT-6.1 Terra public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | GPT-6.1 Terra | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 97.6% | Coming soon | Coming soon |

## FAQ

### Can I compare Claude Mythos 5 and GPT-6.1 Terra on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [Claude Mythos 5 vs Claude Mythos 5.1](/compare/claude-mythos-5-vs-claude-mythos-5-1)
- [GPT-6.1 Terra vs Claude Mythos 5.1](/compare/claude-mythos-5-1-vs-gpt-6-1-terra)
- [Claude Mythos 5 vs Claude Mythos Preview](/compare/claude-mythos-5-vs-claude-mythos-preview)
- [GPT-6.1 Terra vs Claude Mythos Preview](/compare/claude-mythos-preview-vs-gpt-6-1-terra)

## Explore More

- [Claude Mythos 5 profile](/models/claude-mythos-5)
- [GPT-6.1 Terra profile](/models/gpt-6-1-terra)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)