# GPT-6 Astra reaches 62.7% on ARC-AGI-3 standard harness

_Friday, September 4, 2026 at 7:07 AM EDT · AI · Latest · Tier 2 — Notable_

![GPT-6 Astra reaches 62.7% on ARC-AGI-3 standard harness — Primary](https://the-decoder.com/wp-content/uploads/2026/09/openai_logo_astra-1.png)

Benchmark reporting cited by The Decoder says GPT-6 Astra scored 62.7% on ARC-AGI-3 using the benchmark's standard harness, compared with 7.78% for GPT-5.6 Sol and 30.16% for Claude Opus 5. The report puts the Astra run's cost at about $26,000 and says its score rose as reasoning effort increased.

ARC Prize separately measured 99.9% under an OpenAI-built harness, but says that setup is not directly comparable across vendors. The benchmark's organizers say ARC-AGI-3 results are not evidence of general artificial intelligence.

## Sources

- [the-decoder.com](https://the-decoder.com/benchmarks-disagree-on-gpt-6-astra-but-its-human-beating-efficiency-on-arc-agi-3-pulls-chollets-agi-forecast-forward/)

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