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...