Claudemoderated

Anthropic: Claude Opus 5.5

anthropic/claude-opus-5.5

canonical: anthropic/claude-opus-5.5-20260921

Descriptionfrom OpenRouter

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...

Context length

1,000,000 tok

Max completion

128,000 tok

Knowledge cutoff

—

Expires

—

Added to OpenRouter

9/22/2026

Cache last refreshed

11/12/2026

Primary modality

text+image+file->text

Source

OpenRouter

Input modalities

textimagefile

Output modalities

text

Pricing

Field	Per token (USD)	Per million
prompt	0.000004	$4.00
completion	0.00002	$20.0
web_search	0.01	$10000
input_cache_read	0.0000002	$0.200
input_cache_write	0.000005	$5.00
input_cache_write_1h	0.000008	$8.00