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AnthropicClaude Fable 5VSGoogleGemini 3 Flash

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

Our Take

We recommend Claude Fable 5 if you need peak intelligence for complex complex codebases, multi-file repositories, and architectural planning, or the 17.8x cheaper Gemini 3 Flash if your workflow is limited to multi-file code and clearly defined tasks. While Claude Fable 5 holds a major reasoning advantage, Gemini 3 Flash is optimized for high-volume budget pipelines. Choose Claude Fable 5 for architectural codebase planning, or Gemini 3 Flash to maximize your budget for basic scripts.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Evaluation: Claude Fable 5 was evaluated on SWE-bench Pro (scoring 80.3%), while Gemini 3 Flash was evaluated on SWE-bench Verified (scoring 78%).
  • Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Claude Fable 5 scored 94.1%, while Gemini 3 Flash scored 90.4%.
  • Cost Efficiency: Gemini 3 Flash pricing ($0.5/M input, $3/M output) is 17.8x cheaper than Claude Fable 5 ($10/M input, $50/M output).
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    Model Specs

    Claude Fable 5

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)
    80.3%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+3.7%)
    94.1%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $20.00Input: $10.00 | Output: $50.00
    Context Window
    1.05M tokens
    Model Specs

    Gemini 3 Flash

    Website

    Benchmarks & Scores

    Coding (swe-bench-verified)
    78%

    multi-file code and clearly defined tasks

    Reasoning (gpqa-diamond)
    90.4%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)17.8x cheaper
    $1.13Input: $0.50 | Output: $3.00
    Context Window
    1.05M tokens
    Read our data collection methodology

    Frequently Asked Questions about Claude Fable 5 vs Gemini 3 Flash

    Gemini 3 Flash is cheaper than Claude Fable 5. Gemini 3 Flash has a blended cost of $1.13/1M tokens, which is about 17.8x cheaper than Claude Fable 5 at $20.00/1M tokens.

    For coding tasks, Claude Fable 5 scores 80.3% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning), while Gemini 3 Flash scores 78% on swe-bench-verified (multi-file code and clearly defined tasks).

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