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Claude Sonnet 4.5 vs Grok 2
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 42.9% higher average benchmark score. Claude Sonnet 4.5 offers 124.7K more tokens in context window than Grok 2. Grok 2 is $6.00 cheaper per million tokens. 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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xAI
Grok 2, released by xAI in August 2024, is a large language model with 131K token context window and native image understanding, developed with access to real-time information from the X platform. It features multimodal input capabilities and improved reasoning over its predecessor. Grok 2 targets conversational assistants, image analysis, and real-time information retrieval tasks via the xAI API.
1 year newer
Grok 2
xAI
2024-08-14
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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Grok 2
Input:$2.00
Output:$10.00($6.00 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Sonnet 4.5
Average Score:43.9%(+42.9%)
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Grok 2
Average Score:1.0%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Agents43.9%(+42.9%)
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Grok 2
Agents1.0%
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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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Grok 2
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Claude Sonnet 4.5
Avg Score:43.9%(+42.9%)
Providers:3
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Grok 2
Avg Score:1.0%
Providers:1