STEM & Reasoning Benchmark

IMOAnswerBench

IMOAnswerBench - International Mathematical Olympiad answer evaluation benchmark.

Category

STEM & Reasoning

Score type

percent

Scale

100%

higher is better

Models tested

19

What is IMOAnswerBench?

IMOAnswerBench evaluates on International Mathematical Olympiad problems, but only grades the final answer value (answer-only evaluation) instead of full proofs. That makes automated scoring objective and is a good indicator of mathematical ability without the subjectivity of proof grading.

What does it test?

IMOAnswerBench measures hard reasoning in science, technology, engineering and math. In detail, it checks:

  • hard olympiad problems with exact final answers
  • long chains of mathematical reasoning
  • correct numeric results within tolerance-free grading
  • a large, systematically selected olympiad problem set

How to read the score

The score is accuracy: the percentage of tasks answered or solved correctly. 100% means every task was solved perfectly; higher is better.

Frequently asked questions

What is the IMOAnswerBench benchmark?

IMOAnswerBench evaluates on International Mathematical Olympiad problems, but only grades the final answer value (answer-only evaluation) instead of full proofs. That makes automated scoring objective and is a good indicator of mathematical ability without the subjectivity of proof grading.

What does IMOAnswerBench test?

IMOAnswerBench mainly measures hard reasoning in science, technology, engineering and math. Concretely, it checks: hard olympiad problems with exact final answers; long chains of mathematical reasoning; correct numeric results within tolerance-free grading.

How is the IMOAnswerBench score calculated?

The score is accuracy: the percentage of tasks answered or solved correctly. 100% means every task was solved perfectly; higher is better. The declared maximum score of this benchmark is 100.0.

Where do I get IMOAnswerBench data and scores?

The official benchmark page/reference is linked on this page. Every score on Open LLM Radar is also available as open data: download the scores JSON (http://open-llm-radar-api:8000/api/v1/benchmarks/imoanswerbench/scores) or pull it directly from the Open LLM Radar API with any HTTP client.

Model scores 19 models tested

Reset
# Model Score Date Source Verified
1 DeepSeek-V4-Pro
DeepSeek
93%
04.06.2026 Report Unverified
2 Kimi K2.6
Moonshot AI
91.1%
04.06.2026 Report Unverified
3 GLM-5.2
Zhipu AI
91%
17.06.2026 Report Verified
4 DeepSeek-V4-Pro
DeepSeek
89.8%
26.06.2026 Report Verified
5 NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16
NVIDIA
88.6%
04.06.2026 Report Verified
6 DeepSeek-V4-Flash
DeepSeek
88.4%
26.06.2026 Report Verified
7 Kimi K2.5
Moonshot AI
81.8%
23.08.2026 Report Verified
8 Qwen3.6-27B
Qwen Team (Alibaba Cloud)
80.8%
22.04.2026 Qwen Team (official model card) Verified
9 Qwen3.5-27B
Qwen Team (Alibaba Cloud)
79.9%
16.04.2026 Qwen Team (official model card - comparison) Unverified
10 Qwen3.6-35B-A3B
Qwen Team (Alibaba Cloud)
78.9%
16.04.2026 Qwen Team (official model card) Verified
11 Qwen3.5-35B-A3B
Qwen Team (Alibaba Cloud)
76.8%
16.04.2026 Qwen Team (official model card - comparison) Unverified
12 Gemma4-31B-it
Google
74.5%
16.04.2026 Qwen Team (official model card - comparison) Unverified
13 Gemma4-26B-A4B
Google
74.3%
16.04.2026 Qwen Team (official model card - comparison) Unverified
14 Spark-X2.5-4B
SparkLLM (XHToken)
74.2%
— Report Verified
15 Qwen3.5-4B
Qwen
68.5%
— Report Verified
16 Gemma4-12B
Google
57.2%
— Report Verified
17 Spark-X2.5-1.7B
SparkLLM (XHToken)
45.4%
— Report Verified
18 Gemma4-E4B
Google
26.9%
— Report Verified
19 Gemma4-E2B
Google
22.6%
— Report Verified

What now?

You've seen how models score on IMOAnswerBench — here's what to do next.