AnthropicCertifiedReleased 11/24/2025

Claude Opus 4.5

Claude Opus 4.5 is Anthropic’s latest model in the Opus series, meant for demanding reasoning tasks and complex problem solving. This model has improvements in general intelligence and vision compared to previous iterations. In addition, it is suited for difficult coding tasks and agentic workflows, especially those with computer use and tool use, and can effectively handle context usage and external memory files.

View API reference ↓
Input / output priceFrom$5.00 / $25.00per 1M
24h uptime100.00%
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.inferencebureau.com/v1",
  apiKey: process.env.IB_API_KEY,
});

const res = await client.chat.completions.create({
  model: "anthropic/claude-opus-4.5",
  messages: [{ role: "user", content: "Why is the sky blue?" }],
});

console.log(res.choices[0].message.content);

Providers

Dispatch routes requests across these providers and fails over between them without changing the model. Restrict or order providers with team Directives. Prices are gateway list prices before the platform fee.

ProviderContextMax outputLatencyThroughputInputOutputCacheCapabilitiesZDRNo trainingRegionsStatus
Amazon Bedrock200K64K1.3 s53 tps$5.00$25.00Read $0.50Write $6.256 featuresYesYesUS EUCertified
Anthropic200K64K0.9 s51 tps$5.00$25.00Read $0.50Write $6.257 featuresYesYesGlobalCertified
Google Vertex AI200K64K0.6 s49 tps$5.00$25.00Read $0.50Write $6.257 featuresYesYesUS EUCertified

Uptime

24 hours

Request success rate per provider.

Amazon Bedrock100.00%
Anthropic100.00%
Google Vertex AI100.00%

Throughput

last hour

P50 output tokens per second.

Amazon Bedrock53 tps
Anthropic51 tps
Google Vertex AI49 tps

Latency

last hour

P50 time to first token.

Google Vertex AI0.6 s
Anthropic0.9 s
Amazon Bedrock1.3 s

Getting started

Create a key on the API Keys page and set it as IB_API_KEY. See the quickstart.

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.inferencebureau.com/v1",
  apiKey: process.env.IB_API_KEY,
});

const res = await client.chat.completions.create({
  model: "anthropic/claude-opus-4.5",
  messages: [{ role: "user", content: "Why is the sky blue?" }],
});

console.log(res.choices[0].message.content);

Top-level parameters

Standard Chat Completions parameters work as documented. These have model-specific behavior.

ParameterTypeRequiredDescription
modelstringYesModel ID in the form creator/model, e.g. anthropic/claude-opus-4.5. Must be allowed by your team's Directives.
max_tokensnumberNoHard cap on generated tokens, and the basis for the balance reserved per request. Claude Opus 4.5 supports up to 64,000 output tokens.
reasoning{ effort: 'low' | 'medium' | 'high' }NoReasoning effort, mapped to the provider's native configuration. Reasoning tokens count toward output usage.
toolsTool[]NoFunction definitions the model can call. Tool calls are returned in choices[].message.tool_calls.
Supportedmax_tokenstemperaturestoptoolstool_choicereasoninginclude_reasoningresponse_formatstructured_outputs

Input limits

InputSourcesLimits
Text—Prompt and response share the 200K-token context window
ImageURL, base64Sent as image_url content parts; counts as input tokens
PDFURL, base64Sent as file content parts; counts as input tokens

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anthropic/claude-opus-5.5-batch1M$2.00$10.00Read $0.100Write $2.5009/22/2026
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anthropic/claude-opus-51M$5.00$25.00Read $0.50Write $6.2507/24/2026