Who ranks #1 on the ArXivMath leaderboard?
As of September 2, 2026, Claude Fable 5.1 by Anthropic ranks #1 on ArXivMath at 91.3%. API pricing is $10.00/M input and $50.00/M output.
As of September 2, 2026, Claude Fable 5.1 is #1 for ArXivMath at 91.3%. Ranked by the ArXivMath score 4 models in this index have a published ArXivMath score. ArXivMath leaderboard with live API prices. ArXivMath — research-level math problems drawn from recent arXiv abstracts.
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As of September 2, 2026, Claude Fable 5.1 by Anthropic is #1 for ArXivMath at 91.3%. Ranked by the ArXivMath score This board also tracks ArXivMath. Next on the same board: Claude Mythos 5.1 and Claude Sonnet 5. This arxivmath leaderboard ranks models by ArXivMath. Scores come from public evals. Prices are the live API rates in the table above.
Sources: OpenAI API pricing (https://developers.openai.com/api/docs/pricing); Anthropic Claude API pricing (https://platform.claude.com/docs/en/about-claude/pricing); Gemini API pricing (https://ai.google.dev/gemini-api/docs/pricing)
| Rank | Model | ArXivMath | Input /M | Output /M |
|---|---|---|---|---|
| 1 | Claude Fable 5.1 | 91.3% | $10.00 | $50.00 |
| 2 | Claude Mythos 5.1 | 91.3% | $10.00 | $50.00 |
| 3 | Claude Sonnet 5 | 72.2% | $2.00 | $10.00 |
| 4 | Hy3 | 52.2% | $0.13 | $0.53 |
Rank one eval at a time. All LLM benchmarks.
As of September 2, 2026, Claude Fable 5.1 by Anthropic ranks #1 on ArXivMath at 91.3%. API pricing is $10.00/M input and $50.00/M output.
The current ArXivMath ranking as of September 2, 2026 is 1. Claude Fable 5.1 at 91.3%; 2. Claude Mythos 5.1 at 91.3%; 3. Claude Sonnet 5 at 72.2%.
Hy3 is the cheapest scored model on this arxivmath leaderboard at $0.13/M input and $0.53/M output ($0.66 blended). Claude Fable 5.1 still leads ArXivMath at 91.3%.
Not automatically. Claude Fable 5.1 leads ArXivMath, but a cheaper scored model can be the better production choice if the quality gap is small. Use the table to weigh ArXivMath against input/output price, context window, and related evals.
Scores and API prices on this page are refreshed from published evals and provider rates. The snapshot is labeled September 2, 2026. Treat it as a current index, not a one-off blog post.
ArXivMath — research-level math problems drawn from recent arXiv abstracts. This page ranks models that have published a ArXivMath score, with live API token prices on the same row.
This page is the ArXivMath leaderboard. Models are sorted by ArXivMath, with input and output token prices on the same row so you can weigh score against cost. Official boards often omit price; that comparison is the point of this index.
Official eval pages own the methodology. This page keeps the published ArXivMath score next to live API $/M so you can pick a production SKU, not only a trophy number.