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    Side-by-Side Comparison

    Claude Opus 4 vs gpt-5.3-codex

    A detailed comparison of pricing, specifications, and benchmark performance.

    AnthropicClaude Opus 4Anthropic
    vs
    OpenAIgpt-5.3-codexOpenAI
    Metric
    Claude Opus 4
    gpt-5.3-codex
    Provider
    Provider
    Anthropic
    OpenAI
    License
    Proprietary
    Proprietary
    Release Date
    2025-05-22
    2026-02-05
    Pricing (per 1M tokens)
    Input Price+757%
    $15.00
    $1.75
    Output Price+436%
    $75.00
    $14.00
    Blended (1M + 1M)
    $90.00
    $15.75
    Model Details
    Context Window
    200K
    400K
    Max Output Tokens
    32K
    128K
    Knowledge Cutoff
    2025-03-31
    August 2025
    Throughput
    N/A
    N/A
    Benchmarks
    GPQA Diamond
    79.6%
    N/A
    SWE Bench
    72.5%
    N/A
    MMMLU
    89.5%
    N/A
    GRIND
    67.9%
    N/A
    MMLU
    88.8%
    N/A
    MMMU
    76.5%
    N/A

    Verdict

    The Bottom Line

    Both models are closely matched on benchmarks. gpt-5.3-codex has the pricing advantage, making it the better value unless Claude Opus 4's specific capabilities are critical to your workflow.

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