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AnthropicClaude Haiku 4.5VSOpenAIGPT-5.4 nano

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

Our Take

We recommend GPT-5.4 nano for superior overall value and reasoning capabilities, as it is cheaper or equal in cost while delivering peak intelligence. While GPT-5.4 nano excels at complex complex codebases, multi-file repositories, and architectural planning, Claude Haiku 4.5 is suited for scripting multi-file code and clearly defined tasks. Choose GPT-5.4 nano for architectural codebase planning, or Claude Haiku 4.5 if you specifically require its simpler functions profile.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Evaluation: Claude Haiku 4.5 was evaluated on SWE-bench Verified (scoring 73.3%), while GPT-5.4 nano was evaluated on SWE-bench Pro (scoring 52.4%).
  • Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. GPT-5.4 nano scored 82.8%, while Claude Haiku 4.5 scored 73%.
  • Cost Efficiency: Claude Haiku 4.5 pricing ($1/M input, $5/M output) is 0.2x cheaper than GPT-5.4 nano ($0.2/M input, $1.25/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)
    $2.00Input: $1.00 | Output: $5.00
    Context Window
    200k tokens
    Model Specs

    GPT-5.4 nano

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)
    52.4%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+9.8%)
    82.8%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)4.3x cheaper
    $0.46Input: $0.20 | Output: $1.25
    Context WindowLarger
    400k tokens
    Read our data collection methodology

    Frequently Asked Questions about Claude Haiku 4.5 vs GPT-5.4 nano

    GPT-5.4 nano is cheaper than Claude Haiku 4.5. GPT-5.4 nano has a blended cost of $0.46/1M tokens, which is about 4.3x cheaper than Claude Haiku 4.5 at $2.00/1M tokens.

    For coding tasks, Claude Haiku 4.5 scores 73.3% on swe-bench-verified (multi-file code and clearly defined tasks), while GPT-5.4 nano scores 52.4% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).

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