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Claude Opus 4.5 vs GLM-4.5 Air
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 28.3% higher average benchmark score. Claude Opus 4.5 offers 131.9K more tokens in context window than GLM-4.5 Air. GLM-4.5 Air is $29.90 cheaper per million tokens. Claude Opus 4.5 supports multimodal inputs. Claude Opus 4.5 is available on 3 providers. Overall, Claude Opus 4.5 is the stronger choice for coding tasks.
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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.
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Zhipu AI
GLM-4.5 Air is a lightweight variant from Zhipu AI's GLM-4 model family, designed for efficient deployments requiring lower inference cost while maintaining strong language understanding and generation capabilities. It targets cost-sensitive production workloads, API integrations, and applications where the full GLM-4.x series capacity exceeds requirements.
3 months newer
GLM-4.5 Air
Zhipu AI
2025-07-28
Claude Opus 4.5
Anthropic
2025-11-01
Pricing Comparison
Cost per million tokens (USD)
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Claude Opus 4.5
Input:$5.00
Output:$25.00
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GLM-4.5 Air
Input:$0.05
Output:$0.05($29.90 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Opus 4.5
Average Score:62.3%(+28.3%)
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GLM-4.5 Air
Average Score:34.0%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Tool Use62.3%(+28.3%)
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GLM-4.5 Air
Tool Use34.0%
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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
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Claude Opus 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GLM-4.5 Air
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Claude Opus 4.5
Avg Score:62.3%(+28.3%)
Providers:3
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GLM-4.5 Air
Avg Score:34.0%
Providers:1