agentIMAGE

Opus 5.5 delivers frontier results at default effort setting

At its default effort setting, Opus 5.5 reaches frontier-level results at lower cost per task and generates output more than 30% faster than Opus 5.

Claude

@claudeaiArchived 2026.09.23Originally posted 2026.09.23

Opus 5.5 delivers frontier results at default effort setting (image 1 of 4)

Opus 5.5 delivers frontier results at default effort setting (image 2 of 4)

Opus 5.5 delivers frontier results at default effort setting (image 3 of 4)

Opus 5.5 delivers frontier results at default effort setting (image 4 of 4)

Claude @claudeaiOriginally posted 2026.09.23

Open original on X

At its default effort setting, Opus 5.5 delivers frontier results for a fraction of the cost per task, often beating other models running at their highest settings. It also generates output more than 30% faster than Opus 5. https://t.co/GBvrvbsxNL

x.com/claudeai/status/2102435525399331254Archived 2026.09.23 10:43