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Claude Opus 4.5 vs Grok 4
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 9.7% higher average benchmark score. Grok 4 offers 14.5K more tokens in context window than Claude Opus 4.5. Both models have similar pricing. 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 4, released by xAI on July 10, 2025, is a large language model featuring first-principles reasoning and comprehensive multimodal support. It features a 260K token context window and demonstrated strong performance on advanced reasoning and coding benchmarks. Grok 4 targets complex multi-step reasoning tasks, scientific analysis, and agentic workflows via the xAI API.
3 months newer
Grok 4
xAI
2025-07-10
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 4
Input:$5.00
Output:$25.00
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Claude Opus 4.5
Average Score:63.8%(+9.7%)
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Grok 4
Average Score:54.0%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Science87.0%
Finance58.8%(+5.3%)
Agents45.5%(+24.4%)
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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 4
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Claude Opus 4.5
Avg Score:63.8%(+9.7%)
Providers:3
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Grok 4
Avg Score:54.0%
Providers:1