Claude Sonnet 4.6 vs DeepSeek V4

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

	Claude Sonnet 4.6 Anthropic's workhorse coding/agent model; strong tool use, long context.	DeepSeek V4 DeepSeek's V4 generation of open-weight MoE models with 1M-token context and agent-focused reasoning modes.
Category	model	model
Vendor type	commercial	open source
Pricing	usage	free
Strengths	+ Excellent tool-use and structured-output reliability + Long context supports large codebases / document sets + Best-in-class for agentic coding workflows	+ MIT-licensed open weights for both Pro and Flash variants + 1M-token context window + Selectable reasoning effort modes (non-think plus two thinking modes) + Sparse MoE design keeps activated parameters low relative to total size
Tradeoffs	− More expensive than Haiku for high-volume classification − API-only (no on-prem / open weights)	− Branded as a preview release on deepseek.com as of June 2026 − V4-Pro's scale makes self-hosting impractical without large GPU clusters
Used in stacks	19	0