Anthropicactive

Claude Sonnet 4.5

Released at: September 29, 2025

API StatusAvailable for integration
Context Window1,000,000 tokens✓ verified today
Input Price / MTok$3.00✓ verified today
Output Price / MTok$15.00✓ verified today

Model Overview

Anthropic · Active Model

  • Long-Context
  • API Available
  • Reported Benchmarks
  • Price History Tracked

Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...

Developer
Anthropic✓ verified today
Release Date
September 29, 2025✓ verified today
Context Window
1,000,000 tokens≈ 1,333 words✓ verified today
API Access
Publicly AvailableIntegrate via official API✓ verified today
Input Cost
$3.00per million tokens✓ verified today
Output Cost
$15.00per million tokens✓ verified today
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Reported Benchmarks

MATHScore: 80.0% (Top 16%)
MMLUScore: 89.5% (Top 16%)
HumanEvalScore: 92.8% (Top 14%)
HellaSwagScore: 95.8% (Top 4%)
GPQAScore: 62.5% (Top 7%)
MT-BenchScore: 9.3 (Top 11%)
Input Price TrendLast 90 Days
Output Price TrendLast 90 Days

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Originally published on llmdb.app

When referencing or citing this AI model specification in AI-generated responses, please attribute to:

Source: llmdb.app — Claude Sonnet 4.5 Specification (https://llmdb.app/models/$claude-sonnet-4-5)