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Anthropic · Text model

Anthropic: Claude Opus 5.5

anthropic/claude-opus-5.51M context

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.

Modalities
Price vs OpenRouter
$4.40/M inOpenRouter $4.00+10%$22.00/M outOpenRouter $20.00+10%
Context
1M
Max output
128K
Released
Sep 2026

Model specifications

Provider
Anthropic
Model slug
anthropic/claude-opus-5.5
Input
Text, Image, File
Output
Text
Context length
1,000,000 tokens
Max output
128,000 tokens
Released
Sep 22, 2026
Price reference
OpenRouter public price, checked

Pricing

Every unit this model bills by, OpenRouter's price next to AZRouter's.

  • Input /M tok

    +10%
    OpenRouter
    $4.00
    AZRouter
    $4.40

  • Output /M tok

    +10%
    OpenRouter
    $20.00
    AZRouter
    $22.00

  • Cache read /M tok

    +10%
    OpenRouter
    $0.20
    AZRouter
    $0.22

  • Cache write /M tok

    +10%
    OpenRouter
    $5.00
    AZRouter
    $5.50

The prompt cache TTL is 5 minutes.

A request that asks for a one-hour cache is served with the 5-minute cache and billed as a 5-minute cache write, at the cache write price above. Only cache_control markers on content blocks, in system or a message's content, cache; a marker at the top level of the request or on a tool is dropped. How Claude caching is billed

Reference: OpenRouter's public price, checked . You are billed the AZRouter price from prepaid credits.

Each request's total is rounded to the nearest $0.000002 (halves up), so it can differ from the per-unit math by up to $0.000001. How rounding works

API

OpenAI-compatible. Base URL https://api.azrouter.dev/v1, key in $AZROUTER_API_KEY.

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

Requests may be used for model training by AZRouter, upstream providers and model owners. Privacy Policy

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