# Claude Mythos Preview vs GPT-6 Luna

> Side-by-side benchmark comparison for Claude Mythos Preview and GPT-6 Luna across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-mythos-preview-vs-gpt-6-luna
- Last updated: September 22, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Mythos Preview and GPT-6 Luna 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-6 Luna has the lower published output-token price.
- GPT-6 Luna has the larger published context window at 1.05M.

## Model Snapshot

| Property | Claude Mythos Preview | GPT-6 Luna |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | null | 1.05M |
| Independent public score (not head-to-head) | null | 62.33 |
| Benchmarks Covered | 2 | 7 |
| Pricing (input/output) | $25.00 / $125.00 | $0.10 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Mythos Preview public-lane score: Coming soon
- GPT-6 Luna public-lane score: 56.7 (Estimated · #35/157)

| Benchmark | Claude Mythos Preview | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| CyberGym | 83.1% | Coming soon | Coming soon |
| ExploitGym | 17.5% | 11.6% | Claude Mythos Preview |

### Coding

- Winner: Insufficient shared evidence
- Claude Mythos Preview public-lane score: Coming soon
- GPT-6 Luna public-lane score: 66.6 (Estimated · #11/159)

| Benchmark | Claude Mythos Preview | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | Coming soon | 66.6% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Mythos Preview public-lane score: Coming soon
- GPT-6 Luna public-lane score: 78.3 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Mythos Preview public-lane score: Coming soon
- GPT-6 Luna public-lane score: 71.3 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- Claude Mythos Preview public-lane score: Coming soon
- GPT-6 Luna public-lane score: 63.6 (Estimated · #29/189)

| Benchmark | Claude Mythos Preview | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| HealthBench (raw) | Coming soon | 50.0% | Coming soon |
| HealthBench (length-adjusted) | Coming soon | 54.5% | Coming soon |
| HealthBench Professional | Coming soon | 60.8% | Coming soon |
| HealthBench Professional (raw) | Coming soon | 61.2% | Coming soon |
| HealthBench Hard | Coming soon | 31.4% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Mythos Preview and GPT-6 Luna?

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

## Explore More

- [Claude Mythos Preview profile](/models/claude-mythos-preview)
- [GPT-6 Luna profile](/models/gpt-6-luna)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)