BlogLLM Benchmark Scores as Published, Side by Side
Claude Mythos Preview: Benchmark Scores as Published
Every result the catalog holds for Claude Mythos Preview: 21 tests in 12 areas, from 4 pages. 16 printed by Anthropic itself, the rest by the company named beside each number. Each number is as printed; nothing is ranked or rescored.
Developer AnthropicReleased 2026-04-07Data version 2026103001, as of 2026-10-30
Agentic Coding
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| SWE-bench Verified | 93.9% | Anthropic, Claude Opus 4.7checked 2026-10-15 | - |
| SWE-Bench Pro | 77.8% | Anthropic, Claude Fable 5 and Claude Mythos 5checked 2026-10-15; printed on 2 more pages | - |
| Terminal-Bench 2.0 | 82% | Anthropic, Claude Opus 4.7checked 2026-10-15 | Harness: Terminus-2, thinking disabled |
Science and Math
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| GPQA Diamond | 94.6% | Anthropic, Claude Opus 4.7checked 2026-10-15; printed on 1 more page | - |
| BioMysteryBench Human Difficult | 29.6% | Anthropic, Claude Fable 5 and Claude Mythos 5checked 2026-10-15 | - |
| BioMysteryBench Human Solvable | 82.6% | Anthropic, Claude Fable 5 and Claude Mythos 5checked 2026-10-15 | - |
Long Context
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| GraphWalks BFS 1M (F1) | 74.3% | OpenAI, GPT-5.6: Frontier intelligence that scales with your ambitionchecked 2026-10-15 | Context: 1M |
| GraphWalks BFS 256k (F1) | 85.7% | OpenAI, GPT-5.6: Frontier intelligence that scales with your ambitionchecked 2026-10-15 | Context: 256k |
Computer Use
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| OSWorld-Verified | 85.4% | Anthropic, Claude Fable 5 and Claude Mythos 5checked 2026-10-15; printed on 1 more page | - |
Multimodal Understanding
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| CharXiv Reasoning (no tools) | 86.1% | Anthropic, Claude Opus 4.7checked 2026-10-15 | Tools: none |
| CharXiv Reasoning (with tools) | 93.2% | Anthropic, Claude Opus 4.7checked 2026-10-15 | Tools: enabled; exact tools in source |
Cybersecurity
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| CyberGym | 83.1% | Anthropic, Claude Opus 4.7checked 2026-10-15 | - |
| ExploitBench | 69% | Anthropic, Claude Fable 5 and Claude Mythos 5checked 2026-10-15; printed on 1 more page | - |
General Knowledge and Reasoning
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| Humanity's Last Exam (no tools) | 56.8% | Anthropic, Claude Fable 5 and Claude Mythos 5checked 2026-10-15; printed on 1 more page | Tools: none |
| Humanity's Last Exam (with tools) | 64.7% | Anthropic, Claude Fable 5 and Claude Mythos 5checked 2026-10-15; printed on 1 more page | Tools: enabled; exact tools in source |
Tool Use and Workflows
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| Toolathlon | 61.1% | OpenAI, GPT-5.6: Frontier intelligence that scales with your ambitionchecked 2026-10-15 | - |
Web Search and Research
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| BrowseComp | 86.9% | Anthropic, Claude Opus 4.7checked 2026-10-15; printed on 1 more page | - |
Healthcare
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| HealthBench Professional | 64.7% | Anthropic, Claude Fable 5 and Claude Mythos 5checked 2026-10-15 | - |
Engineering and Design
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| BenchCAD | 35.5% | OpenAI, GPT-5.6: Frontier intelligence that scales with your ambitionchecked 2026-10-15 | - |
| BenchCAD (python tool) | 61% | OpenAI, GPT-5.6: Frontier intelligence that scales with your ambitionchecked 2026-10-15 | Tools: python tool |
Preference and Composite Rankings
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| Anthropic ECI (AECI) | 161.88 | Anthropic, Claude Opus 5.5 System Cardchecked 2026-10-25 | - |
More from Anthropic
- Claude Haiku 5.5
- Claude Sonnet 5.5
- Claude Opus 5.5
- Claude Fable 5.1
- Claude Mythos 5.1
- Claude Opus 5
- Claude Sonnet 5
- Claude Fable 5
- Claude Mythos 5
- Claude Opus 4.8
- Claude Opus 4.7
- Claude Sonnet 4.6
- Claude Opus 4.6
- Claude Opus 4.5
- Claude Haiku 4.5
- Claude Sonnet 4.5
- Claude Opus 4.1
- Claude Opus 4
- Claude Sonnet 4
- Claude 3.7 Sonnet
- Claude 3.5 Sonnet
Every number here is read from the same catalog file as the benchmark table, data version 2026103001. Where one page printed the model under several setups, each value is listed. The catalog is public in armanobosyan/sugra-llm-benchmarks; a wrong number can be reported from the table, with Report an error under the value, or as an issue in that repository.