Model comparison
Claude Mythos Preview vs GPT-6 Luna
GPT-6 Luna has enough public results to be ranked (#65); Claude Mythos Preview does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Side by side
| Claude Mythos Preview | GPT-6 Luna | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 40.8 | 45.1 |
| Released | 2026-04-07 | 2026-09-22 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 128K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.50 |
| Results tracked | 2 | 18 |
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Category by category
Coding Not comparable
Claude Mythos Preview: —, GPT-6 Luna: 54.7 (#24)
| Benchmark | Claude Mythos Preview | GPT-6 Luna |
|---|---|---|
| DeepSWE | — | 66.6% |
| FrontierCode | — | 42.4% |
| LMArena WebDev | — | 1583 |
| LMArena Coding | — | 1448 |
Agentic & Tool Use Not comparable
Claude Mythos Preview: 41.1, GPT-6 Luna: —
| Benchmark | Claude Mythos Preview | GPT-6 Luna |
|---|---|---|
| ExploitBench | 73.8% | — |
| METR Time Horizons | 85.2% | — |
Reasoning Not comparable
Claude Mythos Preview: —, GPT-6 Luna: 31.7 (#68)
| Benchmark | Claude Mythos Preview | GPT-6 Luna |
|---|---|---|
| NYT Connections (extended) | — | 68.7% |
| LMArena Hard Prompts | — | 1415 |
Math Not comparable
Claude Mythos Preview: —, GPT-6 Luna: 35.6 (#140)
| Benchmark | Claude Mythos Preview | GPT-6 Luna |
|---|---|---|
| LMArena Math | — | 1396 |
Knowledge Not comparable
Claude Mythos Preview: —, GPT-6 Luna: 40.1 (#110)
| Benchmark | Claude Mythos Preview | GPT-6 Luna |
|---|---|---|
| LMArena Expert | — | 1458 |
Multimodal Not comparable
Claude Mythos Preview: —, GPT-6 Luna: 42.0 (#27)
| Benchmark | Claude Mythos Preview | GPT-6 Luna |
|---|---|---|
| Furniture Assembly | — | 44.2% |
Multilingual Not comparable
Claude Mythos Preview: —, GPT-6 Luna: 51.0 (#111)
| Benchmark | Claude Mythos Preview | GPT-6 Luna |
|---|---|---|
| LMArena Non-English | — | 1390 |
| LMArena Chinese | — | 1425 |
| LMArena Russian | — | 1392 |
| LMArena Spanish | — | 1416 |
Instruction Following Not comparable
Claude Mythos Preview: —, GPT-6 Luna: 74.7 (#85)
| Benchmark | Claude Mythos Preview | GPT-6 Luna |
|---|---|---|
| LMArena Instruction Following | — | 1414 |
Long Context Not comparable
Claude Mythos Preview: —, GPT-6 Luna: 43.3 (#95)
| Benchmark | Claude Mythos Preview | GPT-6 Luna |
|---|---|---|
| LMArena Longer Query | — | 1417 |
Writing & Preference Not comparable
Claude Mythos Preview: —, GPT-6 Luna: 58.4 (#115)
| Benchmark | Claude Mythos Preview | GPT-6 Luna |
|---|---|---|
| LMArena Text | — | 1392 |
| LMArena Creative Writing | — | 1357 |
| LMArena Multi-Turn | — | 1400 |
Frequently asked questions
Is Claude Mythos Preview better than GPT-6 Luna?
GPT-6 Luna has enough public results to be ranked (#65); Claude Mythos Preview does not yet, so treat this comparison as directional.
How many benchmarks do Claude Mythos Preview and GPT-6 Luna share?
0 benchmarks have published results for both models. Claude Mythos Preview has 2 scored results on Noometry and GPT-6 Luna has 18.