Inception: Mercury 3 vs IBM: Granite 4.2 8B: 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.
IBM: Granite 4.2 8B (ibm-granite/granite-4.2-8b) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for IBM: Granite 4.2 8B: Activate ephemeral prefix caching to slash input costs by 50% (down to 0.03/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing Inception: Mercury 3 (API ID: inception/mercury-3) vs IBM: Granite 4.2 8B (API ID: ibm-granite/granite-4.2-8b), IBM: Granite 4.2 8B offers lower standard input pricing at $0.06/1M tokens ($0.25/1M output), while IBM: Granite 4.2 8B leads in cached prefix economics at $0.03/1M 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 | IBM: Granite 4.2 8B | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | inception/mercury-3 | ibm-granite/granite-4.2-8b | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $0.1 / $0.35 | $0.06 / $0.25 | IBM: Granite 4.2 8B |
| Cache Read Price (per 1M) | $0.05/1M (50% Off) | $0.03/1M (50% Off) | IBM: Granite 4.2 8B |
| Context Window / Max Output | 977K In / 128K Out | 128K In / 115K 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
Granite 4.2 8B is a dense reasoning model from IBM. It is suited for mathematics, code generation, multilingual dialogue, and agentic workflows that need multi-step reasoning. It s
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 IBM: Granite 4.2 8B
Granite 4.2 8B is a dense reasoning model from IBM. It is suited for mathematics, code generation, multilingual dialogue, and agentic workflows that need multi-step reasoning. It s Verified P90 latency of 280ms.