Anthropic: Claude Fable 5.1 (batch) vs OpenAI: gpt-oss-20b (batch): Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing Anthropic: Claude Fable 5.1 (batch) (anthropic/claude-fable-5.1:batch) vs OpenAI: gpt-oss-20b (batch) (openai/gpt-oss-20b:batch). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
Anthropic: Claude Fable 5.1 (batch) (anthropic/claude-fable-5.1:batch) — $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).
OpenAI: gpt-oss-20b (batch) (openai/gpt-oss-20b:batch) 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 Anthropic: Claude Fable 5.1 (batch) (API ID: anthropic/claude-fable-5.1:batch) vs OpenAI: gpt-oss-20b (batch) (API ID: openai/gpt-oss-20b:batch), OpenAI: gpt-oss-20b (batch) offers lower standard input pricing at $0.024/1M tokens ($0.112/1M output), while OpenAI: gpt-oss-20b (batch) leads in cached prefix economics at $0.012/1M tokens (50% discount). Anthropic: Claude Fable 5.1 (batch) 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 | Anthropic: Claude Fable 5.1 (batch) | OpenAI: gpt-oss-20b (batch) | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | anthropic/claude-fable-5.1:batch | openai/gpt-oss-20b:batch | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $5 / $25 | $0.024 / $0.112 | OpenAI: gpt-oss-20b (batch) |
| Cache Read Price (per 1M) | $2.5/1M (50% Off) | $0.012/1M (50% Off) | OpenAI: gpt-oss-20b (batch) |
| Context Window / Max Output | 977K In / 125K Out | 128K In / 115K Out | Anthropic: Claude Fable 5.1 (batch) |
| P90 First-Token / Edge Latency | 280ms | 280ms | Anthropic: Claude Fable 5.1 (batch) (-0ms) |
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
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per f
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 (batch) to OpenAI: gpt-oss-20b (batch)
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per f Verified P90 latency of 280ms.