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Claude Sonnet 4.5
Claude Sonnet model optimized for coding, agents and complex workflows
Claude Sonnet 4.5 is positioned as a high-quality model for coding, long-form reasoning, agent workflows and structured professional writing. It is a strong option when reliability and instruction following matter.
starsCapabilities
visibilityVision understandingcodeFunction callingstreamStreaming output
paymentsContext and pricing
Context limit200,000
Max output64,000
Knowledge cutoff2025-07-31
Input price$3/ 1M tokens
Output price$15/ 1M tokens
Cached input price$0.3/ 1M tokens
historyVersions and aliases
Model IDclaude-sonnet-4-5-20250929
Version dateSeptember 29, 2025
Sourcemodels.dev
descriptionOverview
Overview
Claude Sonnet 4.5 is a capable model for demanding knowledge work, especially code, analysis and multi-step task execution.
Best for
Use it for coding agents, document-heavy workflows, technical writing, planning and assistant products that need careful instruction following.
lightbulbUse cases
- Coding agents
- Technical writing
- Long document analysis
- Planning and multi-step workflows
thumb_upStrengths
- Strong coding performance
- Good long-context behavior
- Careful instruction following
- Useful for agentic workflows
infoLimitations
- May cost more than compact models
- Latency can vary by provider
- Availability depends on upstream access