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AnthropicClaude Haiku 4.5VSGoogleGemini 3.5 Flash

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

Our Take

We recommend Gemini 3.5 Flash for complex complex codebases, multi-file repositories, and architectural planning, or the 1.7x cheaper Claude Haiku 4.5 if your budget requires optimizing costs for very high-volume pipelines. While Gemini 3.5 Flash offers a clear reasoning advantage, it carries a moderate price premium. Choose Gemini 3.5 Flash for architectural codebase planning, or Claude Haiku 4.5 to save on API costs for simple scripts.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Evaluation: Claude Haiku 4.5 was evaluated on SWE-bench Verified (scoring 73.3%), while Gemini 3.5 Flash was evaluated on SWE-bench Pro (scoring 55.1%).
  • Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3.5 Flash scored 92.2%, while Claude Haiku 4.5 scored 73%.
  • Cost Efficiency: Claude Haiku 4.5 pricing ($1/M input, $5/M output) is 1.7x cheaper than Gemini 3.5 Flash ($1.5/M input, $9/M output).
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    Model Specs

    Claude Haiku 4.5

    Website

    Benchmarks & Scores

    Coding (swe-bench-verified)
    73.3%

    multi-file code and clearly defined tasks

    Reasoning (gpqa-diamond)
    73%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)1.7x cheaper
    $2.00Input: $1.00 | Output: $5.00
    Context Window
    200k tokens
    Model Specs

    Gemini 3.5 Flash

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)
    55.1%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+19.2%)
    92.2%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $3.38Input: $1.50 | Output: $9.00
    Context WindowLarger
    1.05M tokens
    Read our data collection methodology

    Frequently Asked Questions about Claude Haiku 4.5 vs Gemini 3.5 Flash

    Claude Haiku 4.5 is cheaper than Gemini 3.5 Flash. Claude Haiku 4.5 has a blended cost of $2.00/1M tokens, which is about 1.7x cheaper than Gemini 3.5 Flash at $3.38/1M tokens.

    For coding tasks, Claude Haiku 4.5 scores 73.3% on swe-bench-verified (multi-file code and clearly defined tasks), while Gemini 3.5 Flash scores 55.1% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).

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