Sakana: Fugu Ultra v2 vs OpenAI: GPT-5.1-Codex-Max: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing Sakana: Fugu Ultra v2 (sakana/fugu-ultra-v2) vs OpenAI: GPT-5.1-Codex-Max (openai/gpt-5.1-codex-max). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
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.
OpenAI: GPT-5.1-Codex-Max (openai/gpt-5.1-codex-max) Startup Credits & Batch API 50% Off Promo
OpenAI GPT-6.1 Sol ($2/$10 base rate) qualifies for immediate 75% automatic prefix caching ($0.50/1M), 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 Sakana: Fugu Ultra v2 (API ID: sakana/fugu-ultra-v2) vs OpenAI: GPT-5.1-Codex-Max (API ID: openai/gpt-5.1-codex-max), OpenAI: GPT-5.1-Codex-Max offers lower standard input pricing at $1.25/1M tokens ($10/1M output), while OpenAI: GPT-5.1-Codex-Max leads in cached prefix economics at $0.625/1M tokens (50% discount). Sakana: Fugu Ultra v2 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 | Sakana: Fugu Ultra v2 | OpenAI: GPT-5.1-Codex-Max | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | sakana/fugu-ultra-v2 | openai/gpt-5.1-codex-max | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $5 / $30 | $1.25 / $10 | OpenAI: GPT-5.1-Codex-Max |
| Cache Read Price (per 1M) | $2.5/1M (50% Off) | $0.625/1M (50% Off) | OpenAI: GPT-5.1-Codex-Max |
| Context Window / Max Output | 977K In / 125K Out | 391K In / 125K Out | Sakana: Fugu Ultra v2 |
| P90 First-Token / Edge Latency | 280ms | 280ms | Sakana: Fugu Ultra v2 (-0ms) |
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
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasonin
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 Sakana: Fugu Ultra v2 to OpenAI: GPT-5.1-Codex-Max
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasonin Verified P90 latency of 280ms.