Inception: Mercury 3 vs OpenAI: GPT-4.1 Nano: Live Promos, Pricing, Hidden Fees & Latency
Inception: Mercury 3 (inception/mercury-3) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Inception: Mercury 3: Activate ephemeral prefix caching to slash input costs by 50% (down to 0.05/1M) or route via asynchronous Batch API for 50% off standard token rates.
OpenAI: GPT-4.1 Nano (openai/gpt-4.1-nano) Startup Credits & Batch API 50% Off Promo
OpenAI GPT-6.1 Sol ($2/$10 base rate) qualifies for immediate 95% automatic prefix caching ($0.10/1M), 50% off 24-hour Batch API completions ($1/$5), and up to $150,000 in OpenAI/Azure Foundry credits via Microsoft for Startups Founders Hub (no VC funding required for initial tiers).
In Etuki October 2026 FinOps telemetry comparing Inception: Mercury 3 (API ID: inception/mercury-3) vs OpenAI: GPT-4.1 Nano (API ID: openai/gpt-4.1-nano), Inception: Mercury 3 offers lower standard input pricing at $0.1/1M tokens ($0.35/1M output), while OpenAI: GPT-4.1 Nano leads in cached prefix economics at $0.01/1M tokens (50% discount). Inception: Mercury 3 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 | Inception: Mercury 3 | OpenAI: GPT-4.1 Nano | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | inception/mercury-3 | openai/gpt-4.1-nano | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $0.1 / $0.35 | $0.1 / $0.4 | Inception: Mercury 3 |
| Cache Read Price (per 1M) | $0.05/1M (50% Off) | $0.01/1M (50% Off) | OpenAI: GPT-4.1 Nano |
| Context Window / Max Output | 977K In / 128K Out | 1023K In / 32K Out | Inception: Mercury 3 |
| P90 First-Token / Edge Latency | 280ms | 280ms | Inception: Mercury 3 (-0ms) |
Mercury 3 is a diffusion-based language model from Inception, and the lab's most capable model to date. It is suited for agentic workflows and real-time applications where latency
For tasks that demand low latency, GPT‑4.1 nano is the fastest and cheapest model in the GPT-4.1 series. It delivers exceptional performance at a small size with its 1 million...
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 Inception: Mercury 3 to OpenAI: GPT-4.1 Nano
For tasks that demand low latency, GPT‑4.1 nano is the fastest and cheapest model in the GPT-4.1 series. It delivers exceptional performance at a small size with its 1 million... Verified P90 latency of 280ms.