Vals IOI (IOI)
We show this table for reference; we do not rank on it.
Based on the International Olympiad in Informatics
IOI score on IOI — September 27, 2026
We mirror the published ioi score view for IOI. GPT-6 Astra leads the public snapshot at 100.00%, followed by Claude Opus 5.5 (95.06%) and GPT-5.6 Sol (91.17%). We do not use these results to rank models overall.
GPT-6 Astra
OpenAI
max reasoning
Claude Opus 5.5
Anthropic
GPT-5.6 Sol
OpenAI
max reasoning
36 modelsCodingCurrentDisplay onlyUpdated September 27, 2026
IOI score table (36 models)
ScoreHow IOI is shown here
BenchLM mirrors the public Vals AI IOI leaderboard captured from https://www.vals.ai/benchmarks/ioi and updated by Vals on September 27, 2026. The snapshot preserves overall scores, uncertainty, latency, cost-per-test metadata, and task-level scores where Vals publishes them.
IOI is display only on BenchLM. Vals proprietary or Vals-hosted aggregate views are useful context, but BenchLM does not use them as weighted ranking inputs or as a replacement for benchmark-native source records.
Snapshot
The published IOI snapshot places GPT-6 Astra first at 100.00%. The third row is 8.83 points behind. The broader top-10 range is 31.56 points, so the table still separates the published systems.
36 models have been evaluated on IOI. The benchmark falls in the Coding category. We keep external benchmark mirrors separate from the weighted global scoring system, so these results remain source-specific evidence. IOI is currently displayed for reference but excluded from the scoring formula, so it does not directly affect overall rankings.
About IOI
Year
2026
Tasks
International Olympiad in Informatics-style programming tasks
Format
Accuracy score
Difficulty
Olympiad programming
BenchLM mirrors the public Vals AI IOI leaderboard as display-only external evidence. The captured snapshot preserves overall scores, task-level scores where Vals publishes them, uncertainty, latency, and cost-per-test metadata. It is excluded from BenchLM weighted rankings.
Freshness and provenance
Version
IOI 2026
Refresh cadence
Quarterly
Staleness state
Current
Question availability
Public benchmark set
BenchLM uses freshness metadata to decide whether a benchmark should still be treated as a strong differentiator, a benchmark to watch, or a display-only reference. For the full scoring policy, see the BenchLM methodology page.
Questions
What does IOI measure?
Based on the International Olympiad in Informatics
Which model leads the published IOI snapshot?
GPT-6 Astra currently leads the published IOI snapshot with 100.00% ioi score. BenchLM shows this benchmark for display only and does not use it in overall rankings.
How many models are evaluated on IOI?
The September 27, 2026 snapshot contains 36 AI models.
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
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