Poolside: Laguna S 2.1 vs Anthropic: Claude Fable 5.1: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing Poolside: Laguna S 2.1 (poolside/laguna-s-2.1) vs Anthropic: Claude Fable 5.1 (anthropic/claude-fable-5.1). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
Poolside: Laguna S 2.1 (poolside/laguna-s-2.1) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Poolside: Laguna S 2.1: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.045/1M) or route via asynchronous Batch API for 50% off standard token rates.
Anthropic: Claude Fable 5.1 (anthropic/claude-fable-5.1) — $25,000 Startup Credits & 50% Cache Promo
Anthropic's Q4 2026 developer promotion combines $25,000 in Claude API credits for early-stage builders with a permanent 20% base price reduction on Opus 5.5 ($4/$20), 0.05x ($0.20/1M) prompt cache reads, and 50% off Batch API processing ($2/$10 with 300K max output).
In Etuki October 2026 FinOps telemetry comparing Poolside: Laguna S 2.1 (API ID: poolside/laguna-s-2.1) vs Anthropic: Claude Fable 5.1 (API ID: anthropic/claude-fable-5.1), Poolside: Laguna S 2.1 offers lower standard input pricing at $0.09/1M tokens ($0.18/1M output), while Poolside: Laguna S 2.1 leads in cached prefix economics at $0.045/1M tokens (50% discount). Poolside: Laguna S 2.1 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 | Poolside: Laguna S 2.1 | Anthropic: Claude Fable 5.1 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | poolside/laguna-s-2.1 | anthropic/claude-fable-5.1 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $0.09 / $0.18 | $10 / $50 | Poolside: Laguna S 2.1 |
| Cache Read Price (per 1M) | $0.045/1M (50% Off) | $5/1M (50% Off) | Poolside: Laguna S 2.1 |
| Context Window / Max Output | 1024K In / 128K Out | 977K In / 125K Out | Poolside: Laguna S 2.1 |
| P90 First-Token / Edge Latency | 280ms | 280ms | Poolside: Laguna S 2.1 (-0ms) |
Laguna S 2.1 is the latest coding agent model from [Poolside](<https://poolside.ai/>). Laguna S 2.1 is a 118B total parameter model with 8B active parameters, scoring 70.2% on Term
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, fro
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 Poolside: Laguna S 2.1 to Anthropic: Claude Fable 5.1
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, fro Verified P90 latency of 280ms.