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Claude Opus 4.5 vs Gemini 2.5 Flash
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 32.5% higher average benchmark score. Gemini 2.5 Flash offers 744.2K more tokens in context window than Claude Opus 4.5. Gemini 2.5 Flash is $29.25 cheaper per million tokens. 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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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.
4 months newer
Gemini 2.5 Flash
Google DeepMind
2025-06-17
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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Gemini 2.5 Flash
Input:$0.15
Output:$0.60($29.25 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 6 common benchmarks
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Claude Opus 4.5
Average Score:51.1%(+32.5%)
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Gemini 2.5 Flash
Average Score:18.6%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Science87.0%(+8.7%)
Agents67.8%(+65.3%)
Tool Use62.3%(+58.9%)
Coding59.8%(+43.4%)
Reasoning30.8%(+18.7%)
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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 2.5 Flash
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Claude Opus 4.5
Avg Score:51.1%(+32.5%)
Providers:3
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Gemini 2.5 Flash
Avg Score:18.6%
Providers:2