whichLlmmodel
Back to Dashboard

AnthropicClaude Opus 5VSDeepSeekDeepSeek V4 Flash

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

Our Take

We recommend Claude Opus 5 if you need peak intelligence for reasoning and coding tasks, or the 57.1x cheaper DeepSeek V4 Flash to optimize your budget for high-volume pipelines. While Claude Opus 5 holds a clear performance lead, it carries a heavy price premium. Choose Claude Opus 5 for complex logic, or DeepSeek V4 Flash for budget efficiency.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. Claude Opus 5 scored 79.2%, while DeepSeek V4 Flash scored 49.1%.
  • Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Claude Opus 5 scored 93.7%, while DeepSeek V4 Flash scored 80%.
  • Cost Efficiency: DeepSeek V4 Flash pricing ($0.14/M input, $0.28/M output) is 57.1x cheaper than Claude Opus 5 ($5/M input, $25/M output).
    • Was this recommendation helpful?
    Model Specs

    Claude Opus 5

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)Winner (+30.1%)
    79.2%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+13.7%)
    93.7%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $10.00Input: $5.00 | Output: $25.00
    Context Window
    1.05M tokens
    Model Specs

    DeepSeek V4 Flash

    Open SourceAPI Available
    Website🤗HF

    Benchmarks & Scores

    Coding (swe-bench-pro)
    49.1%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)
    80%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)57.1x cheaper
    $0.17Input: $0.14 | Output: $0.28
    Context Window
    1.05M tokens
    Read our data collection methodology

    Frequently Asked Questions about Claude Opus 5 vs DeepSeek V4 Flash

    DeepSeek V4 Flash is cheaper than Claude Opus 5. DeepSeek V4 Flash has a blended cost of $0.17/1M tokens, which is about 57.1x cheaper than Claude Opus 5 at $10.00/1M tokens.

    Claude Opus 5 is better for coding tasks on this benchmark. It scores 79.2% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to DeepSeek V4 Flash which scores 49.1%.

    Related Matchups

    Explore similar comparisons for Claude Opus 5 and DeepSeek V4 Flash.

    Browse More Comparisons
    AnthropicClaude Opus 5
    VS
    OpenAIGPT-5.5
    Compare Specs
    DeepSeekDeepSeek V4 Flash
    VS
    OpenAIGPT-5.6 Sol
    Compare Specs
    AnthropicClaude Opus 5
    VS
    OpenAIGPT-5.6 Terra
    Compare Specs

    Do you want to find a model for your constraints?

    Use our interactive model finder to filter LLMs by reasoning capability, coding performance, cost, and context length.

    Open Model Finder