Anthropic Claude Sonnet 5.5 vs DeepSeek: DeepSeek V3: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing Anthropic Claude Sonnet 5.5 (claude-sonnet-5-5) vs DeepSeek: DeepSeek V3 (deepseek/deepseek-chat). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
Sonnet 5.5 High-Velocity Coding Promo: $0.10/1M Cached Input & $1/$5 Batch Tier
Anthropic's September/October 2026 rollout prices Claude Sonnet 5.5 at half of Opus 5.5 ($2/$10) while activating $0.10/1M (0.05x) cached input reads and $1.00/$5.00 asynchronous batch processing.
DeepSeek: DeepSeek V3 (deepseek/deepseek-chat) — Automatic Disk KV Cache ($0.16/1M) & 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 Anthropic Claude Sonnet 5.5 (API ID: claude-sonnet-5-5) vs DeepSeek: DeepSeek V3 (API ID: deepseek/deepseek-chat), DeepSeek: DeepSeek V3 offers lower standard input pricing at $0.32/1M tokens ($0.89/1M output), while Anthropic Claude Sonnet 5.5 leads in cached prefix economics at $0.1/1M tokens (95% discount). Anthropic Claude Sonnet 5.5 achieves a 50ms faster P90 time-to-first-token latency (230ms vs 280ms).
Enable Prompt Context Caching & Batch API to reduce repeated system prompt input token burn by 50%-97.5%.
Auto-discovered via live global telemetry registry.
| Specification / FinOps Dimension | Anthropic Claude Sonnet 5.5 | DeepSeek: DeepSeek V3 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | claude-sonnet-5-5 | deepseek/deepseek-chat | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $2 / $10 | $0.32 / $0.89 | DeepSeek: DeepSeek V3 |
| Cache Read Price (per 1M) | $0.1/1M (95% Off) | $0.16/1M (50% Off) | Anthropic Claude Sonnet 5.5 |
| Context Window / Max Output | 1000K In / 128K Out | 160K In / 16K Out | Anthropic Claude Sonnet 5.5 |
| P90 First-Token / Edge Latency | 230ms | 280ms | Anthropic Claude Sonnet 5.5 (-50ms) |
Released Sept 28, 2026 at half of Opus 5.5 price with 0.05x ($0.10/1M) cache reads for high-speed SWE agents.
DeepSeek-V3 is the latest model from the DeepSeek team, building upon the instruction following and coding abilities of the previous versions. Pre-trained on nearly 15 trillion tok
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 Anthropic Claude Sonnet 5.5 to DeepSeek: DeepSeek V3
DeepSeek-V3 is the latest model from the DeepSeek team, building upon the instruction following and coding abilities of the previous versions. Pre-trained on nearly 15 trillion tok Verified P90 latency of 280ms.