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Claude Opus 4.5 vs Gemini 3 Flash
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. Gemini 3 Flash offers 744.2K more tokens in context window than Claude Opus 4.5. Gemini 3 Flash is $29.50 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
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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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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.
1 month newer
Claude Opus 4.5
Anthropic
2025-11-01
Gemini 3 Flash
Google DeepMind
2025-12-17
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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Gemini 3 Flash
Input:$0.10
Output:$0.40($29.50 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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Claude Opus 4.5
Average Score:55.5%
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Gemini 3 Flash
Average Score:55.6%(+0.1%)
Performance comparison across key benchmark categories
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Claude Opus 4.5
Coding61.5%
Reasoning37.6%(+4.0%)
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Gemini 3 Flash
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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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Gemini 3 Flash
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Claude Opus 4.5
Avg Score:55.5%
Providers:3
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Gemini 3 Flash
Avg Score:55.6%(+0.1%)
Providers:2