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Claude Sonnet 4.5 vs Gemini 2.5 Pro
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 4.6% higher average benchmark score. Gemini 2.5 Pro offers 744.2K more tokens in context window than Claude Sonnet 4.5. Gemini 2.5 Pro is $6.75 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
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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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Google DeepMind
Gemini 2.5 Pro, released by Google in May 2025, is a large language model from the Gemini 2.5 family designed for complex reasoning, coding, and long-context analysis tasks. It features a 1M token context window, native support for text, image, video, and audio input, and integrated thinking capabilities for multi-step problem solving. Gemini 2.5 Pro targets advanced coding workflows, scientific reasoning, and applications requiring deep understanding across large, mixed-modality contexts.
4 months newer
Gemini 2.5 Pro
Google DeepMind
2025-05-20
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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Gemini 2.5 Pro
Input:$1.25
Output:$10.00($6.75 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 6 common benchmarks
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Claude Sonnet 4.5
Average Score:38.4%(+4.6%)
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Gemini 2.5 Pro
Average Score:33.8%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Science83.4%(+6.2%)
Tool Use43.8%(+35.0%)
Agents43.2%(+27.7%)
Reasoning17.7%
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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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Gemini 2.5 Pro
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Claude Sonnet 4.5
Avg Score:38.4%(+4.6%)
Providers:3
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Gemini 2.5 Pro
Avg Score:33.8%
Providers:2