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AnthropicClaude Opus 5VSGoogleGemini 3.5 Flash Lite

Analysis by:the whichllmmodel Editorial Team|Updated: June 2026

Our Take

We recommend Claude Opus 5 if you need peak intelligence for reasoning and coding tasks, or the 11.8x cheaper Gemini 3.5 Flash Lite to optimize your budget for high-volume pipelines. While Claude Opus 5 holds a clear performance lead, it carries a heavy price premium. Choose Claude Opus 5 for complex logic, or Gemini 3.5 Flash Lite for budget efficiency.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. Claude Opus 5 scored 79.2%, while Gemini 3.5 Flash Lite scored 54.2%.
  • Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Claude Opus 5 scored 93.7%, while Gemini 3.5 Flash Lite scored 83.8%.
  • Cost Efficiency: Gemini 3.5 Flash Lite pricing ($0.3/M input, $2.5/M output) is 11.8x cheaper than Claude Opus 5 ($5/M input, $25/M output).
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    Model Specs

    Claude Opus 5

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)Winner (+25.0%)
    79.2%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+9.9%)
    93.7%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $10.00Input: $5.00 | Output: $25.00
    Context Window
    1.05M tokens
    Model Specs

    Gemini 3.5 Flash Lite

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)
    54.2%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)
    83.8%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)11.8x cheaper
    $0.85Input: $0.30 | Output: $2.50
    Context Window
    1.05M tokens
    Read our data collection methodology

    Frequently Asked Questions about Claude Opus 5 vs Gemini 3.5 Flash Lite

    Gemini 3.5 Flash Lite is cheaper than Claude Opus 5. Gemini 3.5 Flash Lite has a blended cost of $0.85/1M tokens, which is about 11.8x cheaper than Claude Opus 5 at $10.00/1M tokens.

    Claude Opus 5 is better for coding tasks on this benchmark. It scores 79.2% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to Gemini 3.5 Flash Lite which scores 54.2%.

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