Claude Opus 5.5

Name: Claude Opus 5.5
Brand: anthropic
SKU: anthropic/claude-opus-5.5
Price: 4.2 USD
Availability: InStock

anthropic/claude-opus-5.5

text, image, document in · text out · 1,000,000 context · 128,000 max output

toolsschemavisionreasoningcacheno-trainShow prices also in

Effective cost per 1k requestsInput tokens 2,000Output tokens 500Cached share 50%

cost = p_in·(input − cached) + p_cache_read·cached + p_out·output + p_req; cached tokens are the prefix a sticky endpoint already holds (part2b §9.3), which is why the cheapest list price is not always the cheapest request.

Provider	Region · quant	Context / max out	Input / M	Output / M	Cache read / write	Markup	Per 1k req	Uptime 30 d	TTFT p50 / p95	Throughput	Last 24 h	Fidelity	Data	Capabilities	Status
OpenRouter	global · unknown	1,000,000 / 128,000	$4.200	$21.00	$0.210 / $5.250	+5.0%	$14.910	—	—	—	no traffic	—	no-train 30 d	model default	active

Quick start

curl https://api.ai.ml/v1/chat/completions \
  -H "Authorization: Bearer $AIML_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"anthropic/claude-opus-5.5","messages":[{"role":"user","content":"Say hello"}]}'

Get a key in the console

Changelog

new_model model anthropic/claude-opus-5.5 added (active); endpoint ep_openrouter_claude-opus-5.5_global (anthropic/claude-opus-5.5) added as active; price input 4.200 output 21.000 USD/M 10/5/2026