Claudemoderated

Anthropic: Claude Sonnet 5.5

anthropic/claude-sonnet-5.5

canonical: anthropic/claude-sonnet-5.5-20260928

Descriptionfrom OpenRouter

Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...

Context length

1,000,000 tok

Max completion

128,000 tok

Knowledge cutoff

—

Expires

—

Added to OpenRouter

9/28/2026

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	0.000002	$2.00
completion	0.00001	$10.0
web_search	0.01	$10000
input_cache_read	0.0000001	$0.100
input_cache_write	0.0000025	$2.50
input_cache_write_1h	0.000004	$4.00

Supported parameters(11)

include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatstopstructured_outputstool_choicetoolsverbosity

OpenRouter page

Videos

11:22

I Tested Sonnet 5.5 Against Opus 5.5. Is It Actually Cheaper?

Sep 28, 2026 · YouTube

Rounds

11 answersin this database. A round opens every model's answer to the same prompt.

Oct 18, 2026Model FingerprintsPick Ten Random Thingsin a video round answer
Oct 18, 2026Model FingerprintsName Ten Story Charactersin a video round answer
Oct 18, 2026Model FingerprintsTen Canvas Animation Ideasin a video round answer
Oct 17, 2026Vision & PerceptionCount the Park Catsin a video round answer
Sep 28, 2026CodingNeon Unicorn Frappuccinoin a video round answer
Sep 28, 2026CodingThe Cybertruck rallyin a video round answer
Sep 28, 2026CodingTwo kilobytesin a video round answer
Sep 28, 2026CodingBird Breakdance Animationin a video round answer
Sep 28, 2026CodingUmbrella In High Windin a video round answer
Sep 28, 2026CodingEscalator Reversal Disasterin a video round answer
Sep 28, 2026CodingSpinning cat memein a video round answer