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Claude Sonnet 4 vs Seed-1.8
Comprehensive side-by-side LLM comparison
Seed-1.8 leads with 18.0% higher average benchmark score. Claude Sonnet 4 is available on 3 providers. Overall, Seed-1.8 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4, released by Anthropic in May 2025, is a large language model from the Claude 4 family that delivers a balance of performance and efficiency for coding, reasoning, and analytical tasks. 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 targets development workflows, document analysis, and applications that benefit from the performance characteristics of the Claude 4 generation.
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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.
7 months newer
Claude Sonnet 4
Anthropic
2025-05-14
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
Average Score:43.9%
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Seed-1.8
Average Score:61.9%(+18.0%)
Performance comparison across key benchmark categories
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Claude Sonnet 4
Agents43.9%
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Seed-1.8
Agents61.9%(+18.0%)
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4
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
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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Seed-1.8
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Claude Sonnet 4
Avg Score:43.9%
Providers:3
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Seed-1.8
Avg Score:61.9%(+18.0%)
Providers:0