ElevenRouter
Get started
Anthropic
~anthropic/claude-opus-latest

Claude Opus 5.5

anthropic/claude-opus-5.5Operational

Anthropic's model for long-running agentic coding and knowledge work (September 2026): adaptive thinking always on (default effort medium), 1M context, 128K output, 20% cheaper than Opus 5 with cache reads at 5% of the input price.

Open in request builderTry in playground
Input
$4.00
per 1M tokens
Output
$20.00
per 1M tokens
Cache read
$0.200
per 1M tokens
Context
1M
tokens
Max output
128K
tokens
Official pricing

USD per million tokens, exactly what Anthropic publishes. ElevenRouter adds nothing on tokens.

Input$4.00
Output$20.00
Cache read$0.200
Cache write$5.00
Example · 1,000 in + 500 out$0.01400
Capabilities
  • Tool calling
  • Structured outputs
  • JSON mode
  • Reasoning
  • Vision
  • Audio input
  • Prompt caching
  • Streaming
Modalities
text+image+file->text
Tokenizer
Claude
Released
2026-09-22
Family
claude-opus
Availability

Measured by the routing engine; up when at least one credential can serve the model.

Last 3 days
99.83%
Last 30 days
99.83%
30 days agotoday
Full status page
Observed performance

Real requests over the last 7 days · 3 samples.

TTFT p50
—
TTFT p95
—
Tokens / s p50
—
Tokens / s p95
—

Percentiles appear after five successful requests.

Usage on ElevenRouter

Tokens per day across all customers, anonymous and aggregate.

3.4K tokens · 30d
3 requests in the last 7 days
Use it

Any OpenAI or Anthropic SDK works by changing the base URL. Supported parameters: max_tokens, temperature, top_p, top_k, stop, tools, tool_choice, reasoning, include_reasoning, response_format, structured_outputs.

curl https://elevenrouter.com/api/v1/chat/completions \
  -H "Authorization: Bearer $ELEVENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "model": "anthropic/claude-opus-5.5", "messages": [{ "role": "user", "content": "Hello" }] }'
Request builderFallbacks & variantsSDKs
Related models

Questions

How much does Claude Opus 5.5 cost on ElevenRouter?
Claude Opus 5.5 is billed at Anthropic's official list price: $4.00 per million input tokens and $20.00 per million output tokens, with cached input at $0.200. A request with 1,000 input and 500 output tokens costs about $0.01400.
What is the context length of Claude Opus 5.5?
Claude Opus 5.5 accepts up to 1M tokens of context and can produce up to 128K output tokens.
Does Claude Opus 5.5 support tool calling and structured outputs?
Yes, tool calling is supported and JSON-schema structured outputs are native. Supported parameters: max_tokens, temperature, top_p, top_k, stop, tools, tool_choice, reasoning, include_reasoning, response_format, structured_outputs.
How do I call Claude Opus 5.5?
Send an OpenAI-compatible chat completion to https://elevenrouter.com/api/v1/chat/completions with "model": "anthropic/claude-opus-5.5" and your ElevenRouter key, or use the Anthropic Messages endpoint. Any OpenAI or Anthropic SDK works by changing the base URL.
Is Claude Opus 5.5 available right now?
Availability is measured continuously by the routing engine. Current status: operational, 99.83% uptime over the last 30 days. When one credential fails, requests fail over to another automatically.