Model comparison
Claude Mythos Preview vs GLM-5.2
GLM-5.2 has enough public results to be ranked (#38); Claude Mythos Preview does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in agentic & tool use, where Claude Mythos Preview leads 41.1 to 31.6.
- GLM-5.2 has downloadable open weights; the other is API-only.
Side by side
| Claude Mythos Preview | GLM-5.2 | |
|---|---|---|
| Provider | Anthropic | Z.ai (Zhipu) |
| Noometry Index | 40.8 | 50.9 |
| Released | 2026-04-07 | 2026-06-13 |
| Weights | Proprietary | Open |
| Context window | — | 1M |
| Max output | — | 131K |
| Input $ / M tokens | — | $1.40 |
| Output $ / M tokens | — | $4.40 |
| Results tracked | 2 | 50 |
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Category by category
Coding Not comparable
Claude Mythos Preview: —, GLM-5.2: 50.9 (#37)
| Benchmark | Claude Mythos Preview | GLM-5.2 |
|---|---|---|
| SWE-bench Verified | — | 78.7% |
| DeepSWE | — | 43.8% |
| FrontierCode | — | 24.5% |
| LMArena WebDev | — | 1604 |
| SciCode | — | 50.5% |
| WeirdML | — | 70.1% |
| LMArena Coding | — | 1484 |
| ALE-Bench | — | 1,047 |
Agentic & Tool Use Claude Mythos Preview leads
Claude Mythos Preview: 41.1, GLM-5.2: 31.6 (#63)
| Benchmark | Claude Mythos Preview | GLM-5.2 |
|---|---|---|
| τ²-bench Banking | — | 37.1% |
| PostTrainBench | — | 31.7% |
| ExploitBench | 73.8% | — |
| GBAEval | — | 0% |
| METR Time Horizons | 85.2% | — |
| Vending-Bench 2 | — | 8,314 |
Reasoning Not comparable
Claude Mythos Preview: —, GLM-5.2: 42.1 (#46)
| Benchmark | Claude Mythos Preview | GLM-5.2 |
|---|---|---|
| ARC-AGI-2 | — | 22.8% |
| SimpleBench | — | 58.8% |
| Kagi LLM Benchmark | — | 62.6% |
| NYT Connections (extended) | — | 74.3% |
| ARC-AGI-1 | — | 77% |
| CritPt | — | 20.9% |
| Chess Puzzles | — | 21% |
| EBR-Bench | — | 9.5% |
| LMArena Hard Prompts | — | 1480 |
| Mystery Game Puzzles | — | 19% |
| DTBench | — | 93.6% |
| LMCA | — | 45.8% |
| Surface Evolver Bench | — | 55.6% |
| Epoch Capabilities Index | — | 151.76 |
Math Not comparable
Claude Mythos Preview: —, GLM-5.2: 55.4 (#35)
| Benchmark | Claude Mythos Preview | GLM-5.2 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 59.2% |
| FrontierMath Tier 4 | — | 29.3% |
| MathArena Final-Answer Competitions | — | 67.6% |
| OTIS Mock AIME 2024-2025 | — | 86.4% |
| ProofBench | — | 35% |
| LMArena Math | — | 1482 |
Knowledge Not comparable
Claude Mythos Preview: —, GLM-5.2: 57.1 (#36)
| Benchmark | Claude Mythos Preview | GLM-5.2 |
|---|---|---|
| GPQA Diamond | — | 91.9% |
| SimpleQA Verified | — | 34.2% |
| LMArena Expert | — | 1484 |
Multilingual Not comparable
Claude Mythos Preview: —, GLM-5.2: 56.0 (#25)
| Benchmark | Claude Mythos Preview | GLM-5.2 |
|---|---|---|
| LMArena Non-English | — | 1459 |
| LMArena Chinese | — | 1518 |
| LMArena French | — | 1476 |
| LMArena German | — | 1470 |
| LMArena Japanese | — | 1451 |
| LMArena Korean | — | 1445 |
| LMArena Russian | — | 1467 |
| LMArena Spanish | — | 1477 |
Instruction Following Not comparable
Claude Mythos Preview: —, GLM-5.2: 77.1 (#32)
| Benchmark | Claude Mythos Preview | GLM-5.2 |
|---|---|---|
| LMArena Instruction Following | — | 1465 |
Long Context Not comparable
Claude Mythos Preview: —, GLM-5.2: 45.3 (#43)
| Benchmark | Claude Mythos Preview | GLM-5.2 |
|---|---|---|
| LMArena Longer Query | — | 1479 |
Writing & Preference Not comparable
Claude Mythos Preview: —, GLM-5.2: 70.7 (#20)
| Benchmark | Claude Mythos Preview | GLM-5.2 |
|---|---|---|
| LMArena Text | — | 1470 |
| LMArena Creative Writing | — | 1465 |
| EQ-Bench Creative Writing | — | 1757 |
| EQ-Bench 4 | — | 1222 |
| LMArena Multi-Turn | — | 1468 |
Frequently asked questions
Is Claude Mythos Preview better than GLM-5.2?
GLM-5.2 has enough public results to be ranked (#38); Claude Mythos Preview does not yet, so treat this comparison as directional.
How many benchmarks do Claude Mythos Preview and GLM-5.2 share?
0 benchmarks have published results for both models. Claude Mythos Preview has 2 scored results on Noometry and GLM-5.2 has 50.