Claude Opus 4.5
Chat model by Anthropic.
Claude Opus 4.5 is an intelligent reasoning model designed for multi-day software development tasks, autonomous agents, and deep analytical research.
Context window
Maximum input context length.
200K
Max output
Maximum completion tokens per request.
64K
Maker
Anthropic
Specifications
Context window, ranked against other chat models
Proportional scale: 0 to 1.05M tokens. Not ranked, no published context window: qwen-plus-2025-09-11, voxtral-small-24b-2507, qwen3.6-plus-2026-04-02.
200.0K
tokens64K
tokenschat
Benchmarks & performance rankings
Empirical intelligence benchmarks and category leaderboard placements for Claude Opus 4.5.
Pricing
Rates are read live
Pricing for claude-opus-4-5-20251101 is fetched from the live catalogue on load, so it is never served from a cache that could outlive a repricing.
Provider-Reported Capabilities
What the hosting provider reports for this model, shown as it was returned. nRouter adds nothing to this report and infers nothing that is missing from it.
Availability
Not enough data yet
We have not collected enough health probes for this model to publish an uptime or latency figure. A percentage from a handful of samples is fabricated precision, so none is shown until the sample count supports one.
How Claude Opus 4.5 is billed
Billed at the provider's list price, with no per-token markup.
- Exact list price
- Tokens settle at the published rate of the model that served your call.
- Cache discounts passed through
- Provider prompt-caching discounts reach your balance with no added fee.
- Cost on every response
- Each response carries the
x-nr-request-costheader, so you can reconcile spend per request.
More from Anthropic
Start building with claude-opus-4-5-20251101
One API key, three steps. Choose your tool to begin.
Get a key
Create API keySet your API key
export NROUTER_API_KEY="<YOUR_API_KEY>"Configure Claude Code
Choose a tool, then copy its setup from the panel.
FAQs
What is Claude Opus 4.5?
Claude Opus 4.5 is an intelligent reasoning model designed for multi-day software development tasks, autonomous agents, and deep analytical research.
How much does Claude Opus 4.5 cost?
Claude Opus 4.5 is billed at the provider's list price on nRouter with no per-token markup — tokens settle at the exact upstream rate. Input and output rates are read live, so see the pricing section above for the current figures.
What is the context length of Claude Opus 4.5?
Claude Opus 4.5 supports a 200,000-token context window. It can generate up to 64,000 output tokens per request.
Does Claude Opus 4.5 support tool calling and structured outputs?
Yes. Claude Opus 4.5 supports tool calling (function calling), so it can invoke external tools and APIs during a conversation.
What inputs and outputs does Claude Opus 4.5 support?
Claude Opus 4.5 takes text and images as input and returns text as output.
How do I use Claude Opus 4.5 via nRouter?
Use any OpenAI-compatible client: point it at https://api.nrouter.ai/v1 with your nRouter API key and set the model to "anthropic/claude-opus-4-5-20251101". The quick-start panel above has a copy-paste curl command for this model.
When was Claude Opus 4.5 released?
Claude Opus 4.5 was released on November 24, 2025.
Where is the Claude Opus 4.5 documentation?
Start at nrouter.ai/docs. The quick-start guide (nrouter.ai/docs/getting-started/quick-start) covers API keys and your first request, and the API reference (nrouter.ai/docs/api-reference) lists every parameter.
What other text models does Anthropic have?
Other Anthropic text models on nRouter include Claude Sonnet 4.6 (nrouter.ai/models/claude-sonnet-4-6), Claude Sonnet 4.6 (nrouter.ai/models/anthropic-claude-sonnet-4-6), Claude Haiku 4.5 (nrouter.ai/models/anthropic-claude-haiku-4-5), Claude Sonnet 5.5 (nrouter.ai/models/anthropic-claude-sonnet-5-5).