ChatLLM
Freemium
Users wanting free multi-model access
Claude Sonnet 4.5
FreemiumAPIAgentic
Claude Sonnet 4.5 is Anthropic's latest frontier AI model, designed to excel in coding, complex reasoning, agentic tasks, and computer use.
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Summary
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
SubscriptionLast verified 4 months ago- Price
- $20/mo
- Free Tier
- Chat on web, iOS, Android, and on your desktop. Generate code and visualize data. Write, edit, and create content. Ability to search the web. Memory across conversations. Create files and execute code. Unlock more from Claude with desktop extensions. Connect Slack and Google Workspace services. Integrate any context or tool through connectors with remote MCP. Extended thinking for complex work.
Free
Free
Free for everyone
- Chat on web, iOS, Android, and on your desktop
- Generate code and visualize data
- Write, edit, and create content
- Ability to search the web
- Memory across conversations
- Create files and execute code
- Desktop extensions
- Connect Slack and Google Workspace services
- Integrate any context or tool through connectors with remote MCP
- Extended thinking for complex work
Pro
$20per month
$200/yr Save 17%
For everyday productivity. $17 per month with annual subscription discount ($200 billed up front). $20 if billed monthly.
- Everything in Free, plus
- More usage
- Includes Claude Code
- Includes Claude Cowork
- Access to unlimited projects to organize chats and documents
- Access to Research
- Ability to use more Claude models
- Claude for Microsoft 365
- Claude for Microsoft Outlook
Max
$100per month
Get the most out of Claude. From $100 per month.
- Everything in Pro, plus
- Choose 5x or 20x more usage than Pro
- Higher output limits for all tasks
- Early access to advanced Claude features
- Priority access at high traffic times
View full pricing on anthropic.com →
Pricing may have changed since last verified. Check the official site for current plans.
LLM Spec Sheet
Benchmarks
200k tokensContext Window
Pricing & Limits
- Input price
- $3.00 / 1M tokens
- Output price
- $15.00 / 1M tokens
- Max output tokens
- 64,000
Metrics from vendor, updated .
Find your fit
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Changelog
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.
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
- May 15, 2026
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
Compare Claude Sonnet 4.5
Frequently Asked Questions
- Is Claude Sonnet 4.5 free?
- Claude Sonnet 4.5 offers a free option alongside paid upgrades. Pricing: $20/mo. Check the current allowances and terms before choosing a plan.
- 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.
- 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.
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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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