DeepSeekDeepSeek V4 FlashVSOpenAIGPT-5.5 Pro
Our Take
Standardized reasoning and coding benchmarks are currently pending verification for one or both of these models. We recommend testing DeepSeek V4 Flash and GPT-5.5 Pro directly in their respective provider playgrounds to see which fits your specific prompt styles best.
Was this recommendation helpful?
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)385.7x cheaper
$0.17Input: $0.14 | Output: $0.28Context Window
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
N/Acomplex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+16.2%)
96.2%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$67.50Input: $30.00 | Output: $180.00Context WindowLarger
1.05M tokensFrequently Asked Questions about DeepSeek V4 Flash vs GPT-5.5 Pro
DeepSeek V4 Flash is cheaper than GPT-5.5 Pro. DeepSeek V4 Flash has a blended cost of $0.17/1M tokens, which is about 385.7x cheaper than GPT-5.5 Pro at $67.50/1M tokens.
Related Matchups
Explore similar comparisons for DeepSeek V4 Flash and GPT-5.5 Pro.
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.