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AnthropicClaude Haiku 4.5VSAnthropicClaude Opus 5

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 5.0x cheaper Claude Haiku 4.5 if your workflow is limited to multi-file code and clearly defined tasks. While Claude Opus 5 holds a major reasoning advantage, Claude Haiku 4.5 is optimized for high-volume budget pipelines. Choose Claude Opus 5 for architectural codebase planning, or Claude Haiku 4.5 to maximize your budget for basic scripts.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Evaluation: Claude Haiku 4.5 was evaluated on SWE-bench Verified (scoring 73.3%), while Claude Opus 5 was evaluated on SWE-bench Pro (scoring 79.2%).
  • Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Claude Opus 5 scored 93.7%, while Claude Haiku 4.5 scored 73%.
  • Cost Efficiency: Claude Haiku 4.5 pricing ($1/M input, $5/M output) is 5.0x cheaper than Claude Opus 5 ($5/M input, $25/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)5.0x cheaper
    $2.00Input: $1.00 | Output: $5.00
    Context Window
    200k tokens
    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 (+20.7%)
    93.7%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $10.00Input: $5.00 | Output: $25.00
    Context WindowLarger
    1.05M tokens
    Read our data collection methodology

    Frequently Asked Questions about Claude Haiku 4.5 vs Claude Opus 5

    Claude Haiku 4.5 is cheaper than Claude Opus 5. Claude Haiku 4.5 has a blended cost of $2.00/1M tokens, which is about 5.0x cheaper than Claude Opus 5 at $10.00/1M tokens.

    For coding tasks, Claude Haiku 4.5 scores 73.3% on swe-bench-verified (multi-file code and clearly defined tasks), while Claude Opus 5 scores 79.2% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).

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