claude-sonnet-4.5

completions

byanthropic

claude-sonnet-4.5

completions

Published by: anthropicProvider:

anthropic

Claude Sonnet 4.5 is the best coding model in the world. It's the strongest model for building complex agents. It’s the best model at using computers. And it shows substantial gains in reasoning and math.

Released

Sep 29, 2025

Knowledge

Apr 2, 2025

License

Proprietary

Context

200K

Input

$3 / 1M tokens

Output

$15 / 1M tokens

Cached

$0.3 / 1M tokens

Cached Write

$3.75 / 1M tokens

Capabilities: tools, reasoning

Accepts: text, image

Returns: text

Released Sep 29, 2025Knowledge Cutoff: Apr 2, 2025License: Proprietary

Context: 200K Input: $3 / 1M tokensOutput: $15 / 1M tokensCached: $0.3 / 1M tokensCached Write: $3.75 / 1M tokensCapabilities: tools, reasoningAccepts: text, imageReturns: text

Access claude-sonnet-4.5 through LangDB AI Gateway

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Benchmark Results for claude-sonnet-4.5

Category Performance Scores:

Maths: Score 88.00 (Top 14% - Rank #46)
Finance: Score 75.35 (Top 10% - Rank #33)
Science: Score 77.65 (Top 9% - Rank #29)
Writing: Score 66.86 (Top 11% - Rank #36)
Academia: Score 73.05 (Top 6% - Rank #20)
Marketing: Score 69.22 (Top 7% - Rank #23)
Programming: Score 49.80 (Top 9% - Rank #29)

Overall Performance: 71.41857142857143 average score across all categories

Detailed Benchmark Scores:

Benchmark	Score	Percentile	Domain
HLE	17.30	Top 10%	General Knowledge
GPQA	83.40	Top 8%	STEM (Physics, Chemistry, Biology)
SciCode	44.70	Top 4%	Scientific
MMLU-Pro	87.50	Top 2%	General Knowledge
LiveCodeBench	71.40	Top 20%	Programming
AA Math Index	88.00	Top 14%	Mathematics
AA Coding Index	49.80	Top 9%	Programming
AAII	62.70	Top 6%	General

GPQA Score: 83.40 - Graduate-level reasoning benchmark

Model Comparison:

Provider: anthropic

Model Type: completions

Context Size: 200000 tokens

Comparing against 322 models in the database

Category Scores

Benchmark Tests

View Other Benchmarks

HLE

17.3

General Knowledge

GPQA

83.4

STEM (Physics, Chemistry, Biology)

SciCode

44.7

Scientific

MMLU-Pro

87.5

General Knowledge

LiveCodeBench

71.4

Programming

AA Math Index

88.0

Mathematics

AA Coding Index

49.8

Programming

AAII

62.7

General

Metric	HLE	GPQA	SciCode	MMLU-Pro	LiveCodeBench	AA Math Index	AA Coding Index	AAII
Score	17.3	83.4	44.7	87.5	71.4	88.0	49.8	62.7

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Code Examples

Integration samples and API usage

Code Samples for claude-sonnet-4.5

Python SDK Example:

from openai import OpenAI

client = OpenAI(
    base_url="https://api.us-east-1.langdb.ai/projects/<your_project_id>",
    api_key="<your_api_key>"
)

response = client.chat.completions.create(
    model="claude-sonnet-4.5",
    messages=[
        {"role": "user", "content": "Hello, how are you?"}
    ]
)

print(response.choices[0].message.content)

TypeScript SDK Example:

import OpenAI from 'openai';

const client = new OpenAI({
    baseURL: "https://api.us-east-1.langdb.ai/projects/<your_project_id>",
    apiKey: "<your_api_key>"
});

const response = await client.chat.completions.create({
    model: "claude-sonnet-4.5",
    messages: [
        { role: "user", content: "Hello, how are you?" }
    ]
});

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

cURL Example:

curl -X POST "https://api.us-east-1.langdb.ai/projects/<your_project_id>/v1/chat/completions" \
  -H "Authorization: Bearer <your_api_key>" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4.5",
    "messages": [
        {"role": "user", "content": "Hello, how are you?"}
    ]
  }'

Model: claude-sonnet-4.5

Provider: anthropic

API Endpoint: $https://api.us-east-1.langdb.ai

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claude-sonnet-4.5 by anthropic - AI Model Details, Pricing, and Performance Metrics

claude-sonnet-4.5

claude-sonnet-4.5

Access claude-sonnet-4.5 through LangDB AI Gateway

Category Scores

Benchmark Tests

Compare with Similar Models

Code Examples

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