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Claude Sonnet 4.5

PaidAPIAgentic

Summary

Claude Sonnet 4.5 is Anthropic's latest frontier AI model, designed to excel in coding, complex reasoning, agentic tasks, and computer use.

Claude Sonnet 4.5 is a large language model from Anthropic with particular strengths in software coding, agentic tasks where it runs in a loop and uses tools, and in using computers. The model maintains focus for more than 30 hours on complex, multi-step tasks. Pricing remains the same as Claude Sonnet 4, at $3/$15 per million tokens. It is the most aligned frontier model Anthropic has released, showing large improvements across several areas of alignment compared to previous Claude models.

Bottom line: Claude Sonnet 4.5 shows state-of-the-art performance on benchmarks such as SWE-bench Verified and OSWorld.

Pricing Plans

Per-token
Price
$3 per million input tokens, $15 per million output tokens
Most Popular

Standard API Pricing

Variableper month

Pay-as-you-go per-token pricing without monthly minimums

  • Access via Claude API
  • 200K token context window
  • Coding and agentic capabilities
  • Extended thinking mode
  • Prompt caching available

View full pricing on anthropic.com →

Pricing may have changed since last verified. Check the official site for current plans.

Community Performance Report Card

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Best For: Coding and software engineering tasks, Long-running agentic workflows, Complex multi-step reasoning, Domain-specific analysis (finance, law, medicine), Browser automation and computer use

Community Benchmarks Community

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Large Language Models Multimodal LLMs

Pros

  • State-of-the-art on SWE-bench Verified evaluation for software coding abilities.
  • Significant leap forward on computer use, leading at 61.4% on OSWorld benchmark.
  • Most aligned frontier model with reduced concerning behaviors like sycophancy, deception, and power-seeking.
  • Can maintain focus for more than 30 hours on complex multi-step tasks.

Cons

  • Context window limited to 200K tokens; 1M context beta was deprecated by Anthropic on April 30th 2026.
  • Maximum output capacity of 64K tokens is lower than some competing models.

Community Reviews

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About

Platforms
Claude API (claude-sonnet-4-5), Claude.ai web interface, iOS and Android apps, Amazon Bedrock, Google Cloud Vertex AI
Languages
Supports input and output in multiple languages
API Available
Yes
Self-Hosted
No
Last Updated
2026-05-15T22:04:57.543Z

Best For

Who it's for

  • Coding and software engineering tasks
  • Long-running agentic workflows
  • Complex multi-step reasoning
  • Domain-specific analysis (finance, law, medicine)
  • Browser automation and computer use

What it does well

  • Software development and coding tasks
  • Building autonomous agents
  • Computer automation and browser use
  • Financial analysis and research
  • Code generation and debugging

Integrations

Claude for Chrome extensionClaude Code with checkpoints and VS Code extensioncontext editing feature and memory tool for the Claude API

Discussion Community

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Frequently Asked Questions

Is Claude Sonnet 4.5 free?
Claude Sonnet 4.5 is a paid tool ($3 per million input tokens, $15 per million output tokens). No permanent free tier is offered.
Is Claude Sonnet 4.5 open source?
No — Claude Sonnet 4.5 is a closed-source tool. Source code is not publicly available.
Does Claude Sonnet 4.5 have an API?
Yes. Claude Sonnet 4.5 exposes a developer API. See the official documentation at https://anthropic.com for details.
What are the alternatives to Claude Sonnet 4.5?
Common alternatives include <a href="https://aidiveforge.com/?s=GPT-5%20by%20OpenAI&post_type=hp_listing">GPT-5 by OpenAI</a>, <a href="https://aidiveforge.com/?s=Gemini%202.5%20Pro%20by%20Google&post_type=hp_listing">Gemini 2.5 Pro by Google</a>, <a href="https://aidiveforge.com/?s=Claude%20Opus%204.5%20by%20Anthropic&post_type=hp_listing">Claude Opus 4.5 by Anthropic</a>, <a href="https://aidiveforge.com/listing/grok-code-fast-1/">Grok 4 by xAI</a>. Compare them on AIDiveForge for pricing, features, and platform support.
When was Claude Sonnet 4.5 released?
Claude Sonnet 4.5 was first released in 2025.
What platforms does Claude Sonnet 4.5 support?
Claude Sonnet 4.5 is available on: Claude API (claude-sonnet-4-5), Claude.ai web interface, iOS and Android apps, Amazon Bedrock, Google Cloud Vertex AI.

Hours Saved & ROI Stories Community

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Claude Sonnet 4.5

Claude Sonnet 4.5 is a large language model from Anthropic with particular strengths in software coding, agentic tasks where it runs in a loop and uses tools, and in using computers. It has substantial capability improvements compared to previous Anthropic models on evaluations in areas such as reasoning and mathematics. The model maintains focus for more than 30 hours on complex, multi-step tasks. It is ideal for software development, domain-specific analysis in fields like finance, law, medicine, and STEM, and building intelligent agents.

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