Open problems from the Online Encyclopedia of Integer Sequences: find the rule behind a sequence that no one has formally characterised yet.
Open-ended mathematical discovery rather than problem solving with a known answer.
Extremely few models evaluated and scores are near zero across the board.
| # | Model | Lab | Score | Measured | Method | Source |
|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | Anthropic | 44.0% | 2026-08-11 | independent | Epoch AI Benchmarking Hub |
| 2 | GPT-5.6 Sol | OpenAI | 43.0% | 2026-08-11 | independent | Epoch AI Benchmarking Hub |
| 3 | Claude Opus 4.8 | Anthropic | 39.0% | 2026-08-11 | independent | Epoch AI Benchmarking Hub |
| 4 | GPT-5.5 | OpenAI | 36.0% | 2026-08-11 | independent | Epoch AI Benchmarking Hub |
| 5 | Gemini 3.5 Flash | Google DeepMind | 29.0% | 2026-08-11 | independent | Epoch AI Benchmarking Hub |