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Claude Opus 4.5 vs GPT-5 Mini
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 11.4% higher average benchmark score. GPT-5 Mini offers 168.8K more tokens in context window than Claude Opus 4.5. GPT-5 Mini is $5.00 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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OpenAI
GPT-5 mini, released by OpenAI in August 2025, is a smaller variant from the GPT-5 family that inherits GPT-5's unified reasoning architecture and multimodal capabilities at a reduced inference cost. It targets high-volume production use cases requiring a balance of intelligence and response speed, offering GPT-5 capabilities for applications where full GPT-5 inference costs are a concern.
3 months newer
GPT-5 Mini
OpenAI
2025-08
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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GPT-5 Mini
Input:$5.00
Output:$20.00($5.00 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Opus 4.5
Average Score:30.8%(+11.4%)
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GPT-5 Mini
Average Score:19.4%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Reasoning30.8%(+11.4%)
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GPT-5 Mini
Reasoning19.4%
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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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GPT-5 Mini
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Claude Opus 4.5
Avg Score:30.8%(+11.4%)
Providers:3
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GPT-5 Mini
Avg Score:19.4%
Providers:1