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AnthropicClaude Haiku 4.5VSDeepSeekDeepSeek V4 Flash

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

Our Take

We recommend DeepSeek V4 Flash for superior overall value and reasoning capabilities, as it is cheaper or equal in cost while delivering peak intelligence. While DeepSeek V4 Flash 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 DeepSeek V4 Flash 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 DeepSeek V4 Flash was evaluated on SWE-bench Pro (scoring 49.1%).
  • Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. DeepSeek V4 Flash scored 80%, while Claude Haiku 4.5 scored 73%.
  • Cost Efficiency: Claude Haiku 4.5 pricing ($1/M input, $5/M output) is 0.1x cheaper than DeepSeek V4 Flash ($0.14/M input, $0.28/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

    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)Winner (+7.0%)
    80%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)11.4x cheaper
    $0.17Input: $0.14 | Output: $0.28
    Context WindowLarger
    1.05M tokens
    Read our data collection methodology

    Frequently Asked Questions about Claude Haiku 4.5 vs DeepSeek V4 Flash

    DeepSeek V4 Flash is cheaper than Claude Haiku 4.5. DeepSeek V4 Flash has a blended cost of $0.17/1M tokens, which is about 11.4x 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 DeepSeek V4 Flash scores 49.1% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).

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