Claude Sonnet 4.5

Frontier

Anthropic•Released on 2025-11-15

Anthropic's best value flagship, coding ability close to Opus at 1/5 the price. HN users praise its performance on daily coding tasks, popular choice for Cursor and similar tools.

84
Overall Score

Core Specs

200K
Context Window
64K
Max Output
✓
Reasoning
✗
Open Source
Multimodal Support
textimage

Scenario Scores

Coding
#3 / 891
Writing
#4 / 884
Translation
#5 / 884
Data Analysis
#4 / 885
Conversation
#4 / 887
Image Gen
#5 / 870

Pros & Cons

Pros

  • +Excellent value
  • +Strong coding ability
  • +Fast response
  • +More generous quotas

Cons

  • −Less capable than Opus for complex tasks
  • −Slightly weaker creative writing

Pricing

Input (per 1M tokens)$3.00
Output (per 1M tokens)$15.00
Subscription$20/month
Free trial available
Updated on 2026-03-06

Available In

Claude Code
Anthropic
Cursor
Anysphere
Cline
Open Source

Compare with Others

Claude Sonnet 4.5 vs GPT-5.4 →Claude Sonnet 4.5 vs GPT-5.4 Thinking →Claude Sonnet 4.5 vs Claude Opus 4.6 →

Benchmarks

sweBench69%
mmlu90.5%
humanEval94.2%