Writer: Palmyra X5 vs Sakana: Fugu Ultra v2: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing Writer: Palmyra X5 (writer/palmyra-x5) vs Sakana: Fugu Ultra v2 (sakana/fugu-ultra-v2). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
Writer: Palmyra X5 (writer/palmyra-x5) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Writer: Palmyra X5: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.3/1M) or route via asynchronous Batch API for 50% off standard token rates.
Sakana: Fugu Ultra v2 (sakana/fugu-ultra-v2) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Sakana: Fugu Ultra v2: Activate ephemeral prefix caching to slash input costs by 50% (down to $2.5/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing Writer: Palmyra X5 (API ID: writer/palmyra-x5) vs Sakana: Fugu Ultra v2 (API ID: sakana/fugu-ultra-v2), Writer: Palmyra X5 offers lower standard input pricing at $0.6/1M tokens ($6/1M output), while Writer: Palmyra X5 leads in cached prefix economics at $0.3/1M tokens (50% discount). Writer: Palmyra X5 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 | Writer: Palmyra X5 | Sakana: Fugu Ultra v2 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | writer/palmyra-x5 | sakana/fugu-ultra-v2 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $0.6 / $6 | $5 / $30 | Writer: Palmyra X5 |
| Cache Read Price (per 1M) | $0.3/1M (50% Off) | $2.5/1M (50% Off) | Writer: Palmyra X5 |
| Context Window / Max Output | 1016K In / 8K Out | 977K In / 125K Out | Sakana: Fugu Ultra v2 |
| P90 First-Token / Edge Latency | 280ms | 280ms | Writer: Palmyra X5 (-0ms) |
Palmyra X5 is Writer's most advanced model, purpose-built for building and scaling AI agents across the enterprise. It delivers industry-leading speed and efficiency on context win
Fugu Ultra v2 is the higher-performance model in Sakana AI's Fugu family. Rather than a single monolithic model, Fugu is a learned multi-agent orchestration system: a language mode
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 Writer: Palmyra X5 to Sakana: Fugu Ultra v2
Fugu Ultra v2 is the higher-performance model in Sakana AI's Fugu family. Rather than a single monolithic model, Fugu is a learned multi-agent orchestration system: a language mode Verified P90 latency of 280ms.