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AnthropicClaude Fable 5VSAnthropicClaude Opus 5

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

Our Take

We recommend Claude Opus 5 for a 2.0x API cost saving at identical performance levels. While both models deliver similar intelligence, Claude Opus 5 is the optimal choice for high-volume pipelines. Choose Claude Opus 5 for budget efficiency without sacrificing quality.
▶WHY?
Benchmark Calculations & Evidence:
  • Performance Match: Both models perform almost identically, with an average score gap of just 0.7% across reasoning and coding benchmarks.
  • Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. Claude Fable 5 scored 80.3%, while Claude Opus 5 scored 79.2%.
  • Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Claude Fable 5 scored 94.1%, while Claude Opus 5 scored 93.7%.
  • Cost Efficiency: Claude Opus 5 pricing ($5/M input, $25/M output) is 2.0x cheaper than Claude Fable 5 ($10/M input, $50/M output).
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    Model Specs

    Claude Fable 5

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)Winner (+1.1%)
    80.3%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+0.4%)
    94.1%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $20.00Input: $10.00 | Output: $50.00
    Context Window
    1.05M 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)
    93.7%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)2.0x cheaper
    $10.00Input: $5.00 | Output: $25.00
    Context Window
    1.05M tokens
    Read our data collection methodology

    Frequently Asked Questions about Claude Fable 5 vs Claude Opus 5

    Claude Opus 5 is cheaper than Claude Fable 5. Claude Opus 5 has a blended cost of $10.00/1M tokens, which is about 2.0x cheaper than Claude Fable 5 at $20.00/1M tokens.

    Claude Fable 5 is better for coding tasks on this benchmark. It scores 80.3% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to Claude Opus 5 which scores 79.2%.

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