+
+
+
+
+
+
+
+
VS
VS
VS
VS
VS
VS
Claude Opus 4.5 vs Seed-1.8
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 4.4% higher average benchmark score. Claude Opus 4.5 is available on 3 providers. Both models have their strengths depending on your specific coding needs.
+
+
+
+
Anthropic
Claude Opus 4.5, released by Anthropic in November 2025, is a large language model from the Claude 4.5 family built for demanding reasoning tasks, advanced code generation, and complex agentic workflows. It features a 200K token context window, 64K maximum output tokens, native image understanding, and extended thinking with configurable effort levels. Opus 4.5 targets deep analytical work, multi-step tool orchestration, and applications requiring sustained reasoning across long, complex tasks.
+
+
+
+
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.
1 month newer
Claude Opus 4.5
Anthropic
2025-11-01
Seed-1.8
ByteDance
2025-12-18
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
+
+
+
+
Claude Opus 4.5
Average Score:66.3%(+4.4%)
+
+
+
+
Seed-1.8
Average Score:61.9%
Performance comparison across key benchmark categories
+
+
+
+
Claude Opus 4.5
Agents66.3%(+4.4%)
+
+
+
+
Seed-1.8
Agents61.9%
+
+
+
+
Knowledge Cutoff
Training data recency comparison
Claude Opus 4.5
2025-05
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
+
+
+
+
Claude Opus 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
+
+
+
+
Seed-1.8
+
+
+
+
Claude Opus 4.5
Avg Score:66.3%(+4.4%)
Providers:3
+
+
+
+
Seed-1.8
Avg Score:61.9%
Providers:0