BlogLLM Benchmark Scores as Published, Side by Side
Claude Mythos 5.1: Benchmark Scores as Published
Every result the catalog holds for Claude Mythos 5.1: 74 tests in 5 areas, from 6 pages. 73 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 2026-09-01Context window 1MMax output 128KInput Text, imageOutput TextWeights ClosedData version 2026103001, as of 2026-10-30
Agentic Coding
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| Terminal-Bench 4.0 | 60.9% | Anthropic, System Card: Claude Fable 5.1 & Claude Mythos 5.1checked 2026-10-25; printed on 2 more pages | - |
Science and Math
Cybersecurity
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| ExploitGym | 30.4% | Google, Gemini 4 Carbon: our next frontier modelchecked 2026-10-29 | Attempt budget: time cap per task: 6h |
| Binary Exploitation (control-flow hijacks) | 81 | Anthropic, Claude Haiku 5.5 System Cardchecked 2026-10-19 | - |
| CyScenarioBench | 61.7% | Anthropic, Claude Haiku 5.5 System Cardchecked 2026-10-19 | - |
| Behavioral audit: Dangerous actions while oblivious to a possibly real settinglower is better | 1.121 | Anthropic, Claude Haiku 5.5 System Cardchecked 2026-10-19 | - |
| Behavioral audit: Motivated reasoning (cyber)lower is better | 2.62 | Anthropic, Claude Haiku 5.5 System Cardchecked 2026-10-19 | - |
| Behavioral audit: Unsanctioned sandbox escape attemptlower is better | 1.69 | Anthropic, Claude Haiku 5.5 System Cardchecked 2026-10-19 | - |
Safety and Alignment
Preference and Composite Rankings
| Test | Value | Printed by | Setup as printed |
|---|---|---|---|
| Anthropic ECI (AECI) | 168.12 | Anthropic, Claude Opus 5.5 System Cardchecked 2026-10-25 | - |
Price
API list prices in US dollars per one million tokens, as printed on the developer's pricing page on the day checked.
| Price | Value | Printed by | Setup as printed |
|---|---|---|---|
| Input | $10 | Anthropic, Anthropic API pricingchecked 2026-10-15 | - |
| Cached input | $0.25 | Anthropic, Anthropic API pricingchecked 2026-10-15 | - |
| Cache write | $12.5 | Anthropic, Anthropic API pricingchecked 2026-10-15 | Cache: 5 minute cache |
| Cache write, 1 hour | $20 | Anthropic, Anthropic API pricingchecked 2026-10-15 | - |
| Output | $50 | Anthropic, Anthropic API pricingchecked 2026-10-15 | - |
| Input, batch | $5 | Anthropic, Anthropic API pricingchecked 2026-10-15 | - |
| Output, batch | $25 | Anthropic, Anthropic API pricingchecked 2026-10-15 | - |
More from Anthropic
- Claude Haiku 5.5
- Claude Sonnet 5.5
- Claude Opus 5.5
- Claude Fable 5.1
- Claude Opus 5
- Claude Sonnet 5
- Claude Fable 5
- Claude Mythos 5
- Claude Opus 4.8
- Claude Opus 4.7
- Claude Mythos Preview
- 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.