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Claude Sonnet 4.5 vs UI-TARS-2
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 8.3% higher average benchmark score. Claude Sonnet 4.5 is available on 3 providers. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5, released by Anthropic in September 2025, is a large language model from the Claude 4.5 family that balances response quality and efficiency for coding, agentic tasks, and analytical work. It features a 200K token context window (extendable to 1M tokens in beta), 64K maximum output tokens, native image understanding, and extended thinking support. Sonnet 4.5 targets use cases that require a balance of throughput and reasoning depth, including code generation, data analysis, and multi-step agentic pipelines.
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ByteDance
UI-TARS-2, released by ByteDance in September 2025, is a major generational upgrade of the UI-TARS family of GUI interaction models, with enhanced capabilities across computer control, game environments, code generation, and tool use. It targets agentic workflows requiring robust multimodal understanding of graphical interfaces across diverse application domains.
25 days newer
UI-TARS-2
ByteDance
2025-09-04
Claude Sonnet 4.5
Anthropic
2025-09-29
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Sonnet 4.5
Average Score:61.4%(+8.3%)
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UI-TARS-2
Average Score:53.1%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Agents61.4%(+8.3%)
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UI-TARS-2
Agents53.1%
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Sonnet 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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UI-TARS-2
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Claude Sonnet 4.5
Avg Score:61.4%(+8.3%)
Providers:3
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UI-TARS-2
Avg Score:53.1%
Providers:0