Anthropic Claude Fable 5.1 vs StepFun: Step 5 Preview: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing Anthropic Claude Fable 5.1 (claude-fable-5-1) vs StepFun: Step 5 Preview (stepfun/step-5-preview). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
Anthropic Claude Fable 5.1 (claude-fable-5-1) — $25,000 Startup Credits & 97.5% 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).
StepFun: Step 5 Preview (stepfun/step-5-preview) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for StepFun: Step 5 Preview: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.5/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing Anthropic Claude Fable 5.1 (API ID: claude-fable-5-1) vs StepFun: Step 5 Preview (API ID: stepfun/step-5-preview), StepFun: Step 5 Preview offers lower standard input pricing at $1/1M tokens ($2.7/1M output), while Anthropic Claude Fable 5.1 leads in cached prefix economics at $0.25/1M tokens (97.5% discount). StepFun: Step 5 Preview achieves a 210ms faster P90 time-to-first-token latency (280ms vs 490ms).
Enable Prompt Context Caching & Batch API to reduce repeated system prompt input token burn by 50%-97.5%.
Auto-discovered via live global telemetry registry.
| Specification / FinOps Dimension | Anthropic Claude Fable 5.1 | StepFun: Step 5 Preview | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | claude-fable-5-1 | stepfun/step-5-preview | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $10 / $50 | $1 / $2.7 | StepFun: Step 5 Preview |
| Cache Read Price (per 1M) | $0.25/1M (97.5% Off) | $0.5/1M (50% Off) | Anthropic Claude Fable 5.1 |
| Context Window / Max Output | 1000K In / 128K Out | 1024K In / 63K Out | Anthropic Claude Fable 5.1 |
| P90 First-Token / Edge Latency | 490ms | 280ms | StepFun: Step 5 Preview (-210ms) |
Anthropic specialized frontier model for demanding scientific reasoning, OfficeQA leadership, and long-horizon agentic work.
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in softwar
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 Anthropic Claude Fable 5.1 to StepFun: Step 5 Preview
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in softwar Verified P90 latency of 280ms.