RiemannBench A
AI benchmark · Math
What is RiemannBench?
Mathematical reasoning benchmark reported in Anthropic's Claude Fable 5 and Claude Mythos 5 system card.
Tier A
A
Widely used: a lab reports it, or 50 or more models are scored on it.
How much stands behind a tier: usage, who backs it, a confirmed line from its own site or paper, and a clear read on X. High with three of the four, medium with two, low otherwise.
- 8 models scored
- reported by Anthropic
- in curated RL directories (2 pts)
On X · well regarded, low buzz, from 4 posts about RiemannBench in the last month
Mentioned mainly as one line in Google's Gemini 4 Argon launch results (76.0%); one small account rates it a relatively clean, low-contamination eval.
How we got to tier A
- Adoption: 8 models scored; reported by Anthropic. Tier A.
- On X: well regarded, low buzz. “Mentioned mainly as one line in Google's Gemini 4 Argon launch results (76.0%); one small account rates it a relatively clean, low-contamination eval.” No move.
- In curated RL directories: 2 points, a floor of C.
- Not yet confirmed by a line from its own site or paper.
A clear view on X moves a tier one step up or down; most entries don't move. How tiers work.
Not on the map yet: no line from its own site or paper places it in a domain.
Next: browse all benchmarks. Entry from the RL Research daily scrape of public sources, 2026-10-11 snapshot.