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DeepSeekDeepSeek V4 ProVSOpenAIGPT-5.4 mini

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

Our Take

We recommend GPT-5.4 mini for a 1.3x API cost saving at identical performance levels. While both models deliver similar intelligence, GPT-5.4 mini is the optimal choice for high-volume pipelines. Choose GPT-5.4 mini for budget efficiency without sacrificing quality.
▶WHY?
Benchmark Calculations & Evidence:
  • Performance Match: Both models perform almost identically, with an average score gap of just 1.4% across reasoning and coding benchmarks.
  • Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. DeepSeek V4 Pro scored 52.1%, while GPT-5.4 mini scored 54.4%.
  • Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. DeepSeek V4 Pro scored 88%, while GPT-5.4 mini scored 87.5%.
  • Cost Efficiency: GPT-5.4 mini pricing ($0.75/M input, $4.5/M output) is 1.3x cheaper than DeepSeek V4 Pro ($1.74/M input, $3.48/M output).
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    Model Specs

    DeepSeek V4 Pro

    Open SourceAPI Available
    Website🤗HF

    Benchmarks & Scores

    Coding (swe-bench-pro)
    52.1%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+0.5%)
    88%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $2.17Input: $1.74 | Output: $3.48
    Context WindowLarger
    1.05M tokens
    Model Specs

    GPT-5.4 mini

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)Winner (+2.3%)
    54.4%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)
    87.5%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)1.3x cheaper
    $1.69Input: $0.75 | Output: $4.50
    Context Window
    400k tokens
    Read our data collection methodology

    Frequently Asked Questions about DeepSeek V4 Pro vs GPT-5.4 mini

    GPT-5.4 mini is cheaper than DeepSeek V4 Pro. GPT-5.4 mini has a blended cost of $1.69/1M tokens, which is about 1.3x cheaper than DeepSeek V4 Pro at $2.17/1M tokens.

    GPT-5.4 mini is better for coding tasks on this benchmark. It scores 54.4% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to DeepSeek V4 Pro which scores 52.1%.

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