Opus 4.8 Leads SWE-Bench Pro by 20% Over GPT-5.5

New benchmark results show Anthropic's Opus 4.8 outperforming OpenAI's latest models on the SWE-Bench Pro coding benchmark by a significant margin.

Anthropic's Opus 4.8 model is outperforming GPT-5.5 by 20% on SWE-Bench Pro, a rigorous coding benchmark, according to results shared by @SorinBota_X. Separately, @photographer__ noted that DeepSWE benchmark cost data has also been released, adding a cost-efficiency dimension to the model comparison.

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