DeepSeek V4 Flash vs DeepSeek V3.1
Detailed technical comparison between DeepSeek V4 Flash (DeepSeek) and DeepSeek V3.1 (DeepSeek). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.
Comparison Snapshot
DeepSeek V4 Flash
1,048,576 tokensTie
Equal CapabilityTie
Equal SpeedDeepSeek V4 Flash
$0.10 / MTokDeepSeek V4 Flash
DeepSeek V4 Flash is an efficiency-optimized Mixture-of-Experts model from DeepSeek with 284B total parameters and 13B activated parameters, supporting a 1M-token context window. It is designed for fast inference and...
DeepSeek V3.1
DeepSeek-V3.1 is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes via prompt templates. It extends the DeepSeek-V3 base with a two-phase long-context...
Technical Specifications
🏆 = Superior Spec| Specification | DeepSeek V4 Flash | DeepSeek V3.1 |
|---|---|---|
| Provider | DeepSeek | DeepSeek |
| Context Window | 1,048,576 tokens🏆 | 163,840 tokens |
| Agent Suitability | 86/100 (est.) | Not yet benchmarked |
| Time to First Token (TTFT) | 120 ms (est.) | No public TTFT data |
| Deployment Model | managed api | self hostable |
| Production Stability | Stable GA (est.) | Stable GA (est.) |
| API Available | Yes | Yes |
| Released Date | 2026-04-24 | 2025-08-21 |
API Pricing Comparison
Input Price per Million Tokens
DeepSeek V4 Flash
$0.10
DeepSeek V3.1
$0.25
Output Price per Million Tokens
DeepSeek V4 Flash
$0.20
DeepSeek V3.1
$0.95
💡 Cost Ratio: DeepSeek V4 Flash is 2.6x cheaper per input token than DeepSeek V3.1.
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Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Standardized Scores (0–100%)Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.
DeepSeek V4 Flash Quirks & Gotchas
- ▸Best cost-per-token ratio of any hosted API — ideal for high-throughput pipelines
- ▸Lower agentic performance vs V4 Pro — route complex tool calls accordingly
DeepSeek V3.1 Quirks & Gotchas
No developer gotchas reported.
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