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Compare GPT and Claude on evidence grounding

S2cross model comparison

On the latest judge evaluations, Anthropic Claude Sonnet 4.6 scored 72 on claim grounding versus OpenAI GPT-5 at 68, so Claude leads by 4 points. Claude had 64 evaluations and GPT-5 had 61. The judge summaries also differ in flavor: Claude was described as a coherent hybrid value+momentum process with strong metric use but weakened by record-keeping errors and stop-execution issues; GPT-5 was described as disciplined and value-driven, but with a few metric inaccuracies and rising concentration risk. Both had the same judge spread of 13 points. Across example claims, Claude has both clearly supported grounding cases and unverifiable ones, while GPT-5 shows some well-grounded decision records but also at least one sector-narrative claim judged not verifiable.

What the data suggests: The data suggests Claude is slightly stronger on evidence grounding in the latest evaluation, but the gap is small and should be treated cautiously. The sample is limited to the benchmark records provided, with a single latest date and mixed claim types. Judge disagreement remains material: both models have a 13-point spread, and GPT-5’s median grounding was higher than its latest score, so the ranking is not perfectly stable over time.

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