product

Claude Opus 5.5

First model of the Claude 5.5 family. 2 claims on record, 2 currently valid, 0 superseded, plus 1 post. Last change 2026-09-22.

State as of 2026-11-04

2 asserted claims

fact	value	valid from	conf	sources
context window	1M tokens 2026-09-22 · conf 0.95primary, 1 source for context window	2026-09-22	0.95	primary, 1 source for context window
price	$4 per million input tokens 2026-09-22 · conf 0.95primary, 1 source for price	2026-09-22	0.95	primary, 1 source for price

2026-09-22 · model releasemodel release

Claude Opus 5.51 src

valid

2 changes · superseded claims stay visible

2026-09-22 · priceprice

$4 per million input tokens

valid

2026-09-22 · context windowcontext window

1M tokens

valid