Opus 5 posts 79.2 percent on SWE-bench Pro against Opus 4.8 at 69.2, a 10 point jump with no change in per-token price
Anthropic published most gains as ratios (three times ARC-AGI-3, more than double Frontier-Bench) rather than absolute scores
On CursorBench 3.2 at max effort it lands within 0.5 percent of Fable 5's peak at half the cost per task
Public GDPval-AA figures disagree across sources by up to 117 Elo, so I left that row out entirely
Anthropic shipped Claude Opus 5 on July 24, and the coverage filled up with ratios instead of scores. Three times the next-best model. More than double the previous Opus. Just over a third of the cost. I went looking for the actual numbers behind those phrases. What I found says as much about how model launches get reported as it does about the model.
