Pyyan / Language Models / Claude Opus 5.5

Claude Opus 5.5

Name: Claude Opus 5.5
Brand: Anthropic
Price: 4 USD

Fable 5.1's level of work on most tasks, at 40% less to run than Opus 5.

currentAnthropic ↗Verified 2026-09-24

per M input

Context	1Msource · as of 2026-09-24 · medium confidence
Input ($/Mtok)	$4source · as of 2026-09-24
Output ($/Mtok)	$20source · as of 2026-09-24
Licence	Proprietarysource · as of 2026-09-24
Max output	128Ksource · as of 2026-09-24 · medium confidence
Parameters	Not publishedsource · as of 2026-09-24
Released	22 Sep 2026source · as of 2026-09-24
Model ID	claude-opus-5-5source · as of 2026-09-24

66.4% on Terminal-Bench 4.0 against 52.3% for Opus 5, on Anthropic's own harness
Cache reads cut 60% to $0.20, and output more than 30% faster than Opus 5
Attempts to work around its boundaries 85% less often than Opus 5, Anthropic reports

Best for agentic coding at flagship quality.