DeepSeek V4 Flash 0731 is a sparse mixture-of-experts model from DeepSeek, with 13B active parameters out of 284B total. This re-post-trained revision is suited for coding, reasoning, and agent workflows.
Model details →DeepSeek: DeepSeek V4 Flash 0731 vs OpenRouter: Fusion
DeepSeek: DeepSeek V4 Flash 0731 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
Fusion turns your prompt into a small multi-model deliberation. A panel of expert models (see below) analyzes your prompt in parallel with web search and web fetch enabled, then a...
Model details →Side-by-side comparison
| Capability | DeepSeek: DeepSeek V4 Flash 0731 | OpenRouter: Fusion | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.0M | 1M | 🏆 DeepSeek: DeepSeek V4 Flash 0731 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.09 | $-1000000.00 | 🏆 OpenRouter: Fusion |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $0.18 | $-1000000.00 | 🏆 OpenRouter: Fusion |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | — | 🏆 DeepSeek: DeepSeek V4 Flash 0731 |
| Vision input Accepts image inputs alongside text. | — | — | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | — | 🏆 DeepSeek: DeepSeek V4 Flash 0731 |
Frequently asked questions
Is DeepSeek: DeepSeek V4 Flash 0731 better than OpenRouter: Fusion?
DeepSeek: DeepSeek V4 Flash 0731 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between DeepSeek: DeepSeek V4 Flash 0731 and OpenRouter: Fusion?
Input: $0.09 vs $-1000000.00 per 1M tokens. Output: $0.18 vs $-1000000.00 per 1M tokens.
What context windows do DeepSeek: DeepSeek V4 Flash 0731 and OpenRouter: Fusion support?
DeepSeek: DeepSeek V4 Flash 0731 supports up to 1.0M tokens. OpenRouter: Fusion supports up to 1M tokens.
Do both DeepSeek: DeepSeek V4 Flash 0731 and OpenRouter: Fusion support tool calling?
DeepSeek: DeepSeek V4 Flash 0731: yes. OpenRouter: Fusion: not advertised.
Compare DeepSeek: DeepSeek V4 Flash 0731 with other models
vs Anthropic Claude Haiku Latestvs Anthropic Claude Sonnet Latestvs Anthropic: Claude Fable Latestvs Anthropic: Claude Opus Latest