AI Matters
Why it matters
OpenAI claims new model beats Anthropic's on reasoning test, with caveats
The Decoder OpenAI claims GPT-5.6 Sol beats Opus 5 on ARC-AGI-3 with its latest API and two additional settings
OpenAI said GPT-5.6 Sol scored higher than Anthropic's Opus 5 on the ARC-AGI-3 benchmark, but only when using its own API features rather than the standard test setup.
Why it matters
The claimed win only holds using OpenAI's own API settings, showing how much test conditions can shape AI benchmark results.
Latest brief · Jul 30, 2026