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Claude Opus 4.5 vs Grok 2
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 66.8% higher average benchmark score. Claude Opus 4.5 offers 124.7K more tokens in context window than Grok 2. Grok 2 is $18.00 cheaper per million tokens. 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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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 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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Grok 2
Input:$2.00
Output:$10.00($18.00 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Opus 4.5
Average Score:67.8%(+66.8%)
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Grok 2
Average Score:1.0%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Agents67.8%(+66.8%)
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Grok 2
Agents1.0%
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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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Grok 2
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Claude Opus 4.5
Avg Score:67.8%(+66.8%)
Providers:3
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Grok 2
Avg Score:1.0%
Providers:1