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LLM ComparisonGPT-5.5DeepSeek V3

GPT-5.5 vs DeepSeek V3

Compare GPT-5.5 and DeepSeek V3. Build AI products powered by either model on Appaca.

Model Comparison

FeatureGPT-5.5DeepSeek V3
ProviderOpenAIDeepSeek
Model Typetexttext
Context Window1,000,000 tokensN/A
Input Cost
$5.00/ 1M tokens
N/A
Output Cost
$30.00/ 1M tokens
N/A

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Strengths & Best Use Cases

GPT-5.5

OpenAI

1. Strongest Agentic Coding Model

  • State-of-the-art on Terminal-Bench 2.0 (82.7%), Expert-SWE (73.1%), and SWE-Bench Pro (58.6%), outperforming GPT-5.4 on complex coding tasks.
  • Holds context across large systems, reasons through ambiguous failures, and carries changes through surrounding codebases with fewer tokens.

2. Higher Intelligence at GPT-5.4 Latency

  • Co-designed, trained, and served on NVIDIA GB200/GB300 NVL72 systems to match GPT-5.4 per-token latency while performing at a significantly higher level.
  • Uses fewer tokens to complete the same tasks, making it more efficient as well as more capable.

3. Powerful for Knowledge Work & Computer Use

  • Scores 84.9% on GDPval (44 occupations) and 78.7% on OSWorld-Verified for autonomous computer operation.
  • Excels at generating documents, spreadsheets, and reports; naturally moves across finding information, using tools, and checking output.

4. Scientific Research Co-Scientist

  • Leading performance on GeneBench, BixBench, and FrontierMath; helped discover a new proof about Ramsey numbers verified in Lean.
  • Strong enough to meaningfully accelerate progress at the frontiers of biomedical and mathematical research.

DeepSeek V3

DeepSeek

1. Exceptional at large-scale data analysis

  • Designed to handle massive datasets.
  • Identifies trends, correlations, and anomalies.

2. High performance in predictive analytics

  • Useful for forecasting, modeling, and probabilistic predictions.
  • Popular in finance, medical research, and market trend analysis.

3. Optimized for structured, data-heavy workloads

  • Stronger at analytical and statistical tasks than general text generation.

4. Enterprise-oriented capabilities

  • Built for businesses needing deep insights from continuous data streams.

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