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# The best model solved 31.3% of FrontierMath's hardest problems in 2025, up from 0% in 2024
- URL: https://aiadoption.org/data/frontiermath-tier-4-accuracy/
- Published: 2026-10-19T16:06:35.000Z
- Updated: 2026-10-21T06:00:53.000Z
- Description: GPT-5.2 Pro solved 31.3% of FrontierMath Tier 4, Epoch AI's hardest tier of original maths problems, in 2025. The best result in 2024, from Claude 3.5 Sonnet, was 0%.
- Author: Manu
- Tags: Data, AI Benchmarks, Large Language Models, #chart, #ai-index-2026, #hub-benchmarks

31.3%

▲ 31.3 pts since 2024

of FrontierMath Tier 4 problems solved at the first attempt by GPT-5.2 Pro, 2025

20242025

## What the chart shows

FrontierMath is a set of original, very difficult maths problems from Epoch AI that can take expert mathematicians hours or days. On Tier 4, its hardest tier, the best result rose from 0% in 2024 (Claude 3.5 Sonnet, June 2024 version) to 31.3% in 2025 (GPT-5.2 Pro).

Pass@1 counts a problem as solved only if the model’s first answer is correct. Even the leading model still fails on about two in three of these problems.

## Key numbers

| Measure                                  | Value                   |
| ---------------------------------------- | ----------------------- |
| 2024: Claude 3.5 Sonnet (Jun 2024)       | 0.0%                    |
| 2025: GPT-5.2 Pro                        | 31.3%                   |
| Change, 2024 to 2025                     | +31.3 percentage points |
| Problems still failed by the 2025 leader | 68.7%                   |

## How to read it

- Each bar is the best result recorded in that year; the report names GPT-5.2 Pro (Web App) as the leader at the end of 2025.
- FrontierMath is designed to stay difficult, and Tier 4 is its hardest set.

**Source:** [Epoch AI](https://aiadoption.org/sources/#epoch-ai), 2026, via the AI Index Report 2026 (Stanford HAI), figure 2.5.4: *FrontierMath Tier 4: pass@1 accuracy*. Chart and text by AI Adoption.  
Numbers checked against the published data on 20 October 2026.  
[Download the data (CSV)](https://charts.aiadoption.org/ai-index/csv/frontiermath-tier-4-accuracy.csv?ref=aiadoption.org) · [Cite this chart](#source)