Model comparison
Claude Mythos Preview vs GLM-5.3
GLM-5.3 has enough public results to be ranked (#26); 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 41.4 to 36.4.
- GLM-5.3 has downloadable open weights; the other is API-only.
Side by side
| Claude Mythos Preview | GLM-5.3 | |
|---|---|---|
| Provider | Anthropic | Z.ai (Zhipu) |
| Noometry Index | 41.2 | 54.8 |
| Released | 2026-04-07 | 2026-08-14 |
| Weights | Proprietary | Open |
| Context window | — | 1M |
| Max output | — | 131K |
| Input $ / M tokens | — | $1.40 |
| Output $ / M tokens | — | $4.40 |
| Results tracked | 2 | 42 |
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Category by category
Coding Not comparable
Claude Mythos Preview: —, GLM-5.3: 59.5 (#14)
| Benchmark | Claude Mythos Preview | GLM-5.3 |
|---|---|---|
| DeepSWE | — | 69% |
| FrontierCode | — | 40.1% |
| CursorBench | — | 42.6% |
| LMArena WebDev | — | 1622 |
| FrontierSWE | — | 30.2% |
| SciCode | — | 59% |
| WeirdML | — | 75.4% |
| LMArena Coding | — | 1496 |
| ALE-Bench | — | 1,317 |
Agentic & Tool Use Claude Mythos Preview leads
Claude Mythos Preview: 41.4, GLM-5.3: 36.4 (#38)
| Benchmark | Claude Mythos Preview | GLM-5.3 |
|---|---|---|
| APEX-Agents | — | 56.6% |
| ExploitBench | 73.8% | — |
| METR Time Horizons | 85.2% | — |
| Vending-Bench 2 | — | 8,164 |
Reasoning Not comparable
Claude Mythos Preview: —, GLM-5.3: 46.1 (#46)
| Benchmark | Claude Mythos Preview | GLM-5.3 |
|---|---|---|
| NYT Connections (extended) | — | 74.2% |
| CritPt | — | 19.1% |
| Chess Puzzles | — | 21% |
| LMArena Hard Prompts | — | 1489 |
| Mystery Game Puzzles | — | 33% |
| DTBench | — | 87.7% |
| LMCA | — | 55.5% |
| Bench to the Future 3 | — | 0.15 |
| Epoch Capabilities Index | — | 155.61 |
Math Not comparable
Claude Mythos Preview: —, GLM-5.3: 62.3 (#33)
| Benchmark | Claude Mythos Preview | GLM-5.3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 68.8% |
| FrontierMath Tier 4 | — | 29.3% |
| OTIS Mock AIME 2024-2025 | — | 91.1% |
| ProofBench | — | 49% |
| LMArena Math | — | 1489 |
Knowledge Not comparable
Claude Mythos Preview: —, GLM-5.3: 58.3 (#37)
| Benchmark | Claude Mythos Preview | GLM-5.3 |
|---|---|---|
| GPQA Diamond | — | 90.9% |
| SimpleQA Verified | — | 41% |
| LMArena Expert | — | 1516 |
Multilingual Not comparable
Claude Mythos Preview: —, GLM-5.3: 55.7 (#28)
| Benchmark | Claude Mythos Preview | GLM-5.3 |
|---|---|---|
| LMArena Non-English | — | 1457 |
| LMArena Chinese | — | 1528 |
| LMArena French | — | 1499 |
| LMArena German | — | 1499 |
| LMArena Japanese | — | 1453 |
| LMArena Korean | — | 1472 |
| LMArena Russian | — | 1463 |
| LMArena Spanish | — | 1460 |
Instruction Following Not comparable
Claude Mythos Preview: —, GLM-5.3: 77.5 (#23)
| Benchmark | Claude Mythos Preview | GLM-5.3 |
|---|---|---|
| LMArena Instruction Following | — | 1477 |
Long Context Not comparable
Claude Mythos Preview: —, GLM-5.3: 45.4 (#41)
| Benchmark | Claude Mythos Preview | GLM-5.3 |
|---|---|---|
| LMArena Longer Query | — | 1482 |
Writing & Preference Not comparable
Claude Mythos Preview: —, GLM-5.3: 75.7 (#6)
| Benchmark | Claude Mythos Preview | GLM-5.3 |
|---|---|---|
| LMArena Text | — | 1471 |
| LMArena Creative Writing | — | 1457 |
| EQ-Bench Creative Writing | — | 2075 |
| LMArena Multi-Turn | — | 1472 |
Frequently asked questions
Is Claude Mythos Preview better than GLM-5.3?
GLM-5.3 has enough public results to be ranked (#26); Claude Mythos Preview does not yet, so treat this comparison as directional.
How many benchmarks do Claude Mythos Preview and GLM-5.3 share?
0 benchmarks have published results for both models. Claude Mythos Preview has 2 scored results on Noometry and GLM-5.3 has 42.