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Claude Sonnet 4.5 vs GLM-4.5 Air
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 9.8% higher average benchmark score. Claude Sonnet 4.5 offers 131.9K more tokens in context window than GLM-4.5 Air. GLM-4.5 Air is $17.90 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. 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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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.
2 months newer
GLM-4.5 Air
Zhipu AI
2025-07-28
Claude Sonnet 4.5
Anthropic
2025-09-29
Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
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GLM-4.5 Air
Input:$0.05
Output:$0.05($17.90 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Sonnet 4.5
Average Score:43.8%(+9.8%)
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GLM-4.5 Air
Average Score:34.0%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Tool Use43.8%(+9.8%)
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GLM-4.5 Air
Tool Use34.0%
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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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GLM-4.5 Air
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Claude Sonnet 4.5
Avg Score:43.8%(+9.8%)
Providers:3
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GLM-4.5 Air
Avg Score:34.0%
Providers:1