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Claude Opus 4.5 vs GPT-5.1 Thinking
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 5.9% higher average benchmark score. 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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OpenAI
GPT-5.1 Thinking, released by OpenAI in November 2025, is an extended reasoning variant from the GPT-5.1 family that applies chain-of-thought processing to improve accuracy on complex reasoning, mathematics, and coding tasks. It targets analytical workflows where deliberate reasoning over a problem significantly improves output quality.
Launched on the same date
Claude Opus 4.5
Anthropic
2025-11-01
GPT-5.1 Thinking
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Opus 4.5
Average Score:55.9%(+5.9%)
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GPT-5.1 Thinking
Average Score:50.0%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Coding80.9%(+4.6%)
Reasoning30.8%(+7.1%)
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GPT-5.1 Thinking
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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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GPT-5.1 Thinking
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Claude Opus 4.5
Avg Score:55.9%(+5.9%)
Providers:3
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GPT-5.1 Thinking
Avg Score:50.0%
Providers:0