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Claude Sonnet 4.5 vs Grok 3
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 21.3% higher average benchmark score. Grok 3 offers 752.4K more tokens in context window than Claude Sonnet 4.5. Both models have similar pricing. 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 3, released by xAI in February 2025, is a large language model trained on xAI's Colossus supercluster with substantially increased compute over previous generations. It features a 1M token context window, RL-enhanced Think mode for extended reasoning, and demonstrated strong results on mathematics, coding, and scientific benchmarks. Grok 3 targets complex reasoning, real-time information tasks via X platform integration, and agentic workflows via the xAI API.
7 months newer
Grok 3
xAI
2025-02-17
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 3
Input:$3.00
Output:$15.00
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Sonnet 4.5
Average Score:21.4%(+21.3%)
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Grok 3
Average Score:0.1%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Agents43.9%(+42.6%)
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Grok 3
Agents1.3%
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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 3
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Claude Sonnet 4.5
Avg Score:21.4%(+21.3%)
Providers:3
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Grok 3
Avg Score:0.1%
Providers:1