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Claude Sonnet 4.5 vs Gemini 2.5 Flash
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 21.2% higher average benchmark score. Gemini 2.5 Flash offers 744.2K more tokens in context window than Claude Sonnet 4.5. Gemini 2.5 Flash is $17.25 cheaper per million tokens. Overall, Claude Sonnet 4.5 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 2.5 Flash, released by Google in June 2025, is a large language model from the Gemini 2.5 family optimized for high-throughput, cost-efficient deployments with multimodal reasoning. It features a 1M token context window, hybrid thinking control, and native support for text, image, video, and audio input. Gemini 2.5 Flash targets latency-sensitive applications, document analysis, and high-volume API workloads that benefit from combined reasoning and generation in a single model.
3 months newer
Gemini 2.5 Flash
Google DeepMind
2025-06-17
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 Flash
Input:$0.15
Output:$0.60($17.25 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 6 common benchmarks
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Claude Sonnet 4.5
Average Score:39.8%(+21.2%)
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Gemini 2.5 Flash
Average Score:18.6%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Science83.4%(+5.1%)
Coding51.0%(+34.6%)
Agents43.9%(+41.4%)
Tool Use43.8%(+40.4%)
Reasoning17.7%(+5.6%)
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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 Flash
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Claude Sonnet 4.5
Avg Score:39.8%(+21.2%)
Providers:3
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Gemini 2.5 Flash
Avg Score:18.6%
Providers:2