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Claude Sonnet 4.5 vs Seed-1.8
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. Claude Sonnet 4.5 is available on 3 providers. Both models have their strengths depending on your specific coding needs.
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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
Seed-1.8, developed by ByteDance Seed, is a generalized agentic large language model supporting text and image input, with industry-leading GUI agent capabilities and improvements in multimodal reasoning over its predecessor Seed1.5-VL. It targets information retrieval, code generation, GUI interaction, and complex agentic workflows requiring robust multimodal understanding.
2 months newer
Claude Sonnet 4.5
Anthropic
2025-09-29
Seed-1.8
ByteDance
2025-12-18
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%
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Seed-1.8
Average Score:61.9%(+0.5%)
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Agents61.4%
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Seed-1.8
Agents61.9%(+0.5%)
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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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Seed-1.8
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Claude Sonnet 4.5
Avg Score:61.4%
Providers:3
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Seed-1.8
Avg Score:61.9%(+0.5%)
Providers:0