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Anthropic: Claude Sonnet 5 vs Google: Gemini 3.5 Flash

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.

Anthropic: Claude Sonnet 5 Google: Gemini 3.5 Flash
Vendoranthropicgoogle
Quality Score100100
Benchmark Score63.953.5
Input Price$2.00/M$1.50/M
Output Price$10.00/M$9.00/M
Context Window1,000,0001,048,576
Max Output128,00065,536
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio-✓
Benchmark Scores
ai_index63.053.8

Who wins by task?

TaskAnthropic: Claude Sonnet 5Google: Gemini 3.5 Flash
SQL Generation 140 139
Code Review 144 142
Code Completion 118 119
Code Refactoring 146 144
Bug Fixing 148 146
Unit Test Generation 131 130
Code Documentation 135 134
Regex Writing 123 123
CI/CD Pipelines 127 126
Frontend Component Design 129 128
Data Analysis 133 132
CSV / Spreadsheet Cleanup 135 135
ETL Scripting 136 135
JSON Extraction 121 121
Bulk Data Labeling 118 118
OCR / Document Parsing 134 133
Table Extraction from PDFs 134 133
Long-Document Summarization 146 145
Short-Form Summarization 116 116
Blog Post Writing 128 127

Scores reflect capability match + benchmark data + pricing for each task. Methodology →

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