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AnthropicClaude Opus 5VSMistral AIMistral Small 4

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

Our Take

We recommend Claude Opus 5 if you need peak intelligence for complex complex codebases, multi-file repositories, and architectural planning, or the 38.1x cheaper Mistral Small 4 if your workflow is limited to scripting single-file apps or clearly defined functions. While Claude Opus 5 holds a major reasoning advantage, Mistral Small 4 is optimized for high-volume budget pipelines. Choose Claude Opus 5 for architectural codebase planning, or Mistral Small 4 to maximize your budget for basic scripts.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Evaluation: Claude Opus 5 was evaluated on SWE-bench Pro (scoring 79.2%), while Mistral Small 4 was evaluated on LiveCodeBench (scoring 63.6%).
  • Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Claude Opus 5 scored 93.7%, while Mistral Small 4 scored 71.2%.
  • Cost Efficiency: Mistral Small 4 pricing ($0.15/M input, $0.6/M output) is 38.1x 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)
    79.2%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+22.5%)
    93.7%

    graduate-level science QA

    Cost & Context

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

    Mistral Small 4

    Open SourceAPI Available
    Website🤗HF

    Benchmarks & Scores

    Coding (live-code-bench)
    63.6%

    scripting single-file apps or clearly defined functions

    Reasoning (gpqa-diamond)
    71.2%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)38.1x cheaper
    $0.26Input: $0.15 | Output: $0.60
    Context Window
    262.14k tokens
    Read our data collection methodology

    Frequently Asked Questions about Claude Opus 5 vs Mistral Small 4

    Mistral Small 4 is cheaper than Claude Opus 5. Mistral Small 4 has a blended cost of $0.26/1M tokens, which is about 38.1x cheaper than Claude Opus 5 at $10.00/1M tokens.

    For coding tasks, Claude Opus 5 scores 79.2% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning), while Mistral Small 4 scores 63.6% on live-code-bench (scripting single-file apps or clearly defined functions).

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