Legacy compatibility id mapping to DeepSeek V4 Flash thinking mode (per DeepSeek pricing notes).
Model details →DeepSeek Reasoner (legacy id) vs DeepSeek V4 Flash Latest
DeepSeek V4 Flash Latest wins on 5 of 6 axes — pricing and capability skew in its favour for most workloads.
This model always redirects to the latest model in the DeepSeek V4 Flash family.
Model details →Side-by-side comparison
| Capability | DeepSeek Reasoner (legacy id) | DeepSeek V4 Flash Latest | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 1.0M | 🏆 DeepSeek V4 Flash Latest |
| Input price (per 1M) Cost per million input tokens billed by the provider. | Custom | $0.09 | 🏆 DeepSeek V4 Flash Latest |
| Output price (per 1M) Cost per million output tokens billed by the provider. | Custom | $0.18 | 🏆 DeepSeek V4 Flash Latest |
| Tool / function calling First-class support for emitting structured tool calls. | — | Yes | 🏆 DeepSeek V4 Flash Latest |
| Vision input Accepts image inputs alongside text. | — | — | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | — | Yes | 🏆 DeepSeek V4 Flash Latest |
Frequently asked questions
Is DeepSeek Reasoner (legacy id) better than DeepSeek V4 Flash Latest?
DeepSeek V4 Flash Latest wins on 5 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between DeepSeek Reasoner (legacy id) and DeepSeek V4 Flash Latest?
Input: Custom vs $0.09 per 1M tokens. Output: Custom vs $0.18 per 1M tokens.
What context windows do DeepSeek Reasoner (legacy id) and DeepSeek V4 Flash Latest support?
DeepSeek Reasoner (legacy id) supports up to 1M tokens. DeepSeek V4 Flash Latest supports up to 1.0M tokens.
Do both DeepSeek Reasoner (legacy id) and DeepSeek V4 Flash Latest support tool calling?
DeepSeek Reasoner (legacy id): not advertised. DeepSeek V4 Flash Latest: yes.