ARC Harness
Astra's ARC Score Is 63% or Nearly 100%, Depending on the Harness
GPT-6 Astra on ARC-AGI-3 Semi-Private: Standard vs Provider Adapter. ARC Prize Foundation evaluation of OpenAI GPT-6 Astra on ARC-AGI-3
Astra's ARC Score Is 63% or Nearly 100%, Depending on the Harness
Why it matters: ARC Prize finds GPT-6 Astra scores 62.7% on ARC-AGI-3 Semi-Private with the Standard harness, but 99.9% with the Provider Adapter harness that preserves opaque reasoning state—showing how the same model can look near-perfect or merely strong depending on evaluation setup.
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- ARC Prize Foundation
- Unit
- % ARC-AGI-3 Semi-Private
- Data as of
- September 3, 2026
- Scope
- ARC Prize Foundation evaluation of OpenAI GPT-6 Astra on ARC-AGI-3