DeepSeek V3 vs GPT-5.5

Pick two tools from the same category to compare side-by-side.

	DeepSeek V3 Open-weights model with strong reasoning at very low inference cost.	GPT-5.5 OpenAI's flagship frontier model, positioned as a new class of intelligence for coding and professional work.
Category	model	model
Vendor type	open source	commercial
Pricing	free	usage
Strengths	+ Open weights + Very low inference cost + Strong reasoning benchmarks	+ OpenAI's recommended model for complex reasoning and coding + 1M-token context window with up to 128K output tokens + Generally available via the OpenAI API with listed pricing of $5 input / $30 output per million tokens
Tradeoffs	− Geopolitical considerations for some enterprises	− Most expensive tier in OpenAI's lineup; GPT-5.4 is positioned as the more affordable option for similar work − API-only commercial model; no open weights
Used in stacks	0	0