RankingARC-AGI · 2
ARC-AGI · 2
- Bucket
- Hard reasoning
- Unit
- percent
- Direction
- Higher is better
- Version
- 2
- Display harness
- Claude Fable 5.1 and Claude Mythos 5.1 System Card
- Board
- https://www.anthropic.com/claude-fable-5-1-mythos-5-1-system-card
Compare published benchmark results with category weights →
Models
| Model | Score | Harness | Evidence | Source-recorded date |
|---|---|---|---|---|
| GPT-5.6 SolOpenAI | 92.5%Reported settings & sourceARC Prize semi-private validation; verified Fable5.1 max effort; comparator figures as reported in summary. Claude Fable 5.1 and Claude Mythos 5.1 System Card · Table8.1.A;8.16 · reviewed 2026-09-12 | Claude Fable 5.1 and Claude Mythos 5.1 System Card | lab self-report | 2026-09-12 |
| Claude Opus 5Anthropic | 90.42%Reported settings & sourceARC Prize semi-private validation; verified Fable5.1 max effort; comparator figures as reported in summary. Claude Fable 5.1 and Claude Mythos 5.1 System Card · Table8.1.A;8.16 · reviewed 2026-09-12 | Claude Fable 5.1 and Claude Mythos 5.1 System Card | lab self-report | 2026-09-12 |
| Claude Fable 5.1Anthropic | 90%Reported settings & sourceARC Prize semi-private validation; verified Fable5.1 max effort; comparator figures as reported in summary. Fable is the safeguarded deployed configuration; selected tasks may use disclosed Opus fallback, except evaluations explicitly counting safety blocks as failures. Claude Fable 5.1 and Claude Mythos 5.1 System Card · Table8.1.A;8.16 · reviewed 2026-09-12 | Claude Fable 5.1 and Claude Mythos 5.1 System Card | lab self-report | 2026-09-12 |
| Claude Fable 5Anthropic | 89.2%Reported settings & sourceARC Prize semi-private validation; verified Fable5.1 max effort; comparator figures as reported in summary. Fable is the safeguarded deployed configuration; selected tasks may use disclosed Opus fallback, except evaluations explicitly counting safety blocks as failures. Claude Fable 5.1 and Claude Mythos 5.1 System Card · Table8.1.A;8.16 · reviewed 2026-09-12 | Claude Fable 5.1 and Claude Mythos 5.1 System Card | lab self-report | 2026-09-12 |