Claude Opus 4.5
VerifiedMultimodal analysis with 200k-token context for complex inputs.
About Claude Opus 4.5
Developed by Anthropic, Claude Opus 4.5 integrates vision and language processing in a single architecture. Its 200,000-token context allows it to manage lengthy documents alongside visual data without losing coherence. The model remains closed-source, consistent with Anthropic's approach to controlled deployment.
Strengths center on accurate interpretation of combined file, image, and text inputs. It maintains factual grounding while addressing nuanced queries that span multiple modalities. Users apply it to tasks requiring sustained attention over large multimodal datasets.
Typical usage includes research synthesis, document review with visual elements, and content creation that references both text and imagery. The system prioritizes safety constraints built into its training process.
Capabilities
How Claude Opus 4.5 compares
Claude Opus 4.5 (striped bar) vs other multimodal on intelligence, speed and price.
Price
USD per 1M output tokens · Lower is better · Claude Opus 4.5 ranks #53 of 63
Sources: Artificial Analysis (intelligence, speed) · OpenRouter (price).
Best for
Long-Document Legal Review
Processes contracts, case files, and regulatory documents spanning up to 200,000 tokens while cross-referencing attached exhibits and diagrams for inconsistency detection and clause summarization.
Large-Scale Code Refactoring
Manages code generation and refactoring across extensive repositories, incorporating visual mockups or architecture diagrams to align implementation with complex project requirements.
Multimodal Research Synthesis
Conducts in-depth reasoning over scientific papers and datasets by interpreting charts, images, and figures embedded in lengthy source material for integrated insights.
Strengths & limitations
Strengths
- +Strong analytical and reasoning depth
- +Careful safety alignment
- +Effective large-context comprehension
- +High-quality structured outputs
Limitations
- –Can be overly cautious on edge cases
- –Slower inference on complex inputs
- –Knowledge limited to training cutoff
Cost calculator
Estimate what Claude Opus 4.5 would cost for your usage.
Based on Claude Opus 4.5's $5.00/1M input · $25.00/1M output. Estimate only — actual cost varies by provider and caching.
Quick start
OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. Only the model slug changes between models.
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://openrouter.ai/api/v1",
apiKey: process.env.OPENROUTER_API_KEY,
});
const completion = await client.chat.completions.create({
model: "anthropic/claude-opus-4.5",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(completion.choices[0].message.content);Model slug: anthropic/claude-opus-4.5
Editor's verdict
Claude Opus 4.5 is Anthropic's proprietary multimodal with a 200K-token context window.
At $25.00 per 1M output tokens, it is premium-priced for its class.
It is available through Anthropic's API and aggregators like OpenRouter.
Best suited to strong analytical and reasoning depth and careful safety alignment.
Frequently asked questions
The model supports a context length of 200,000 tokens for handling extended documents and conversations.
User reviews
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