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OpenAI's GPT-5.6 Sol benchmark claims questioned over custom test harness

By PulseAugur Editorial · [4 sources] ·

OpenAI claims its new GPT-5.6 Sol model can outperform Anthropic's Opus 5 on the ARC-AGI-3 benchmark. However, this superior score of 38.3% was achieved using OpenAI's proprietary API features, including retained reasoning and context compaction. When tested in the official, provider-neutral ARC-AGI-3 environment, GPT-5.6 Sol scored only 7.8%, while Opus 5 achieved 30.2% without such specialized settings. AI

IMPACT Highlights ongoing challenges in fair and standardized benchmarking of large language models.

RANK_REASON The cluster reports on claims made by OpenAI about a model's performance on a benchmark, but focuses on the controversy surrounding the testing methodology rather than an official release or research paper.

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AI-generated summary · Google Gemini · from 4 sources. How we write summaries →

OpenAI's GPT-5.6 Sol benchmark claims questioned over custom test harness

COVERAGE [4]

  1. The Decoder TIER_1 English(EN) · Matthias Bastian ·

    OpenAI claims GPT-5.6 Sol beats Opus 5 on ARC-AGI-3 with its latest API and two additional settings

    <p><img alt="" class="attachment-full size-full wp-post-image" height="768" src="https://the-decoder.com/wp-content/uploads/2026/06/openai_gpt56_sol.png" style="height: auto; margin-bottom: 10px;" width="1376" /></p> <p> OpenAI counters Anthropic's ARC-AGI-3 record: GPT-5.6 Sol s…

  2. The Decoder TIER_1 English(EN) · Matthias Bastian ·

    OpenAI claims GPT-5.6 Sol beats Opus 5 on ARC-AGI-3 but only with its own custom test harness

    <p><img alt="" class="attachment-full size-full wp-post-image" height="768" src="https://the-decoder.com/wp-content/uploads/2026/06/openai_gpt56_sol.png" style="height: auto; margin-bottom: 10px;" width="1376" /></p> <p> OpenAI counters Anthropic's ARC-AGI-3 record: GPT-5.6 Sol s…

  3. Mastodon — fosstodon.org TIER_1 English(EN) · [email protected] ·

    OpenAI says GPT-5.6 Sol beats Opus 5 on ARC-AGI-3, but only with its own API features. Without them, the score drops to 7.8%. Fair benchmarking remains a challe

    OpenAI says GPT-5.6 Sol beats Opus 5 on ARC-AGI-3, but only with its own API features. Without them, the score drops to 7.8%. Fair benchmarking remains a challenge. Source: The Decoder AI https:// the-decoder.com/openai-claims- gpt-5-6-sol-beats-opus-5-on-arc-agi-3-with-its-lates…

    LINKS the-decoder.com/openai-claims-gpt-5-6-sol…
  4. Mastodon — mastodon.social TIER_1 English(EN) · sipirtu ·

    OpenAI says GPT-5.6 Sol tops Opus 5 on ARC-AGI-3 with a custom harness but scores 7.8 percent in the official test. Opus 5 reached 30.2 percent without special

    OpenAI says GPT-5.6 Sol tops Opus 5 on ARC-AGI-3 with a custom harness but scores 7.8 percent in the official test. Opus 5 reached 30.2 percent without special setups. Source: The Decoder AI https:// the-decoder.com/openai-claims- gpt-5-6-sol-beats-opus-5-on-arc-agi-3-but-only-wi…

    LINKS the-decoder.com/openai-claims-gpt-5-6-sol…

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