Perplexity: Sonar Deep Research vs DeepSeek: DeepSeek V4.1 Flash 1017: Live Promos, Pricing, Hidden Fees & Latency
Perplexity: Sonar Deep Research (perplexity/sonar-deep-research) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Perplexity: Sonar Deep Research: Activate ephemeral prefix caching to slash input costs by 50% (down to 1/1M) or route via asynchronous Batch API for 50% off standard token rates.
DeepSeek: DeepSeek V4.1 Flash 1017 (deepseek/deepseek-v4.1-flash-1017) — Automatic Disk KV Cache (0.15/1M) & Off-Peak Promo
DeepSeek-V4 Pro (1.6T MoE) automatically caches repeated 64-token prompt prefixes on NVMe storage at $0.07/1M input tokens (50% off $0.14 base) with zero code changes required, plus off-peak UTC scheduling discounts.
In Etuki October 2026 FinOps telemetry comparing Perplexity: Sonar Deep Research (API ID: perplexity/sonar-deep-research) vs DeepSeek: DeepSeek V4.1 Flash 1017 (API ID: deepseek/deepseek-v4.1-flash-1017), DeepSeek: DeepSeek V4.1 Flash 1017 offers lower standard input pricing at $0.3/1M tokens ($1.2/1M output), while DeepSeek: DeepSeek V4.1 Flash 1017 leads in cached prefix economics at $0.15/1M tokens (50% discount). Perplexity: Sonar Deep Research achieves a 0ms faster P90 time-to-first-token latency (280ms vs 280ms).
Auto-discovered via live global telemetry registry.
Auto-discovered via live global telemetry registry.
| Specification / FinOps Dimension | Perplexity: Sonar Deep Research | DeepSeek: DeepSeek V4.1 Flash 1017 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | perplexity/sonar-deep-research | deepseek/deepseek-v4.1-flash-1017 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $2 / $8 | $0.3 / $1.2 | DeepSeek: DeepSeek V4.1 Flash 1017 |
| Cache Read Price (per 1M) | $1/1M (50% Off) | $0.15/1M (50% Off) | DeepSeek: DeepSeek V4.1 Flash 1017 |
| Context Window / Max Output | 125K In / 113K Out | 1024K In / 384K Out | DeepSeek: DeepSeek V4.1 Flash 1017 |
| P90 First-Token / Edge Latency | 280ms | 280ms | Perplexity: Sonar Deep Research (-0ms) |
Sonar Deep Research is a research-focused model designed for multi-step retrieval, synthesis, and reasoning across complex topics. It autonomously searches, reads, and evaluates so
DeepSeek V4.1 Flash 1017 is the October 17, 2026 snapshot of DeepSeek V4.1 Flash, served by DeepSeek under the `deepseek-flash` API model name. V4.1 Flash is a sparse mixture-of-ex
Real-Time Stack Cost & Hidden-Fee Simulator (MAU / Token / Egress / GMV)
Calibrated with Reddit r/FinOps & r/devops telemetry: Includes Context Caching, Bandwidth Egress, and MoR Tax
🛰️Switch from Perplexity: Sonar Deep Research to DeepSeek: DeepSeek V4.1 Flash 1017
DeepSeek V4.1 Flash 1017 is the October 17, 2026 snapshot of DeepSeek V4.1 Flash, served by DeepSeek under the `deepseek-flash` API model name. V4.1 Flash is a sparse mixture-of-ex Verified P90 latency of 280ms.