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Claude Sonnet 4.5 vs Gemini 3 Flash
Comprehensive side-by-side LLM comparison
Gemini 3 Flash leads with 8.4% higher average benchmark score. Gemini 3 Flash offers 744.2K more tokens in context window than Claude Sonnet 4.5. Gemini 3 Flash is $17.50 cheaper per million tokens. Overall, Gemini 3 Flash is the stronger choice for coding tasks.
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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 3 Flash, released by Google in December 2025, is a large language model from the Gemini 3 family that delivers reasoning and coding performance with efficiency optimized for high-volume workloads. It features a 1M token context window, 64K maximum output tokens, and native support for text, image, audio, video, and PDF input. Gemini 3 Flash targets cost-sensitive agentic workflows, document processing, and production APIs requiring fast, capable multimodal responses.
2 months newer
Claude Sonnet 4.5
Anthropic
2025-09-29
Gemini 3 Flash
Google DeepMind
2025-12-17
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 3 Flash
Input:$0.10
Output:$0.40($17.50 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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Claude Sonnet 4.5
Average Score:47.2%
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Gemini 3 Flash
Average Score:55.6%(+8.4%)
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding58.4%
Reasoning13.6%
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Gemini 3 Flash
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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 3 Flash
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Claude Sonnet 4.5
Avg Score:47.2%
Providers:3
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Gemini 3 Flash
Avg Score:55.6%(+8.4%)
Providers:2