OpenAI: GPT-5.5 Pro vs Anthropic: Claude Fable 5: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-5.5 Pro (openai/gpt-5.5-pro) vs Anthropic: Claude Fable 5 (anthropic/claude-fable-5). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-5.5 Pro (openai/gpt-5.5-pro) 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).
Anthropic: Claude Fable 5 (anthropic/claude-fable-5) — $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 OpenAI: GPT-5.5 Pro (API ID: openai/gpt-5.5-pro) vs Anthropic: Claude Fable 5 (API ID: anthropic/claude-fable-5), Anthropic: Claude Fable 5 offers lower standard input pricing at $10/1M tokens ($50/1M output), while Anthropic: Claude Fable 5 leads in cached prefix economics at $5/1M tokens (50% discount). OpenAI: GPT-5.5 Pro 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 | OpenAI: GPT-5.5 Pro | Anthropic: Claude Fable 5 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-5.5-pro | anthropic/claude-fable-5 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $30 / $180 | $10 / $50 | Anthropic: Claude Fable 5 |
| Cache Read Price (per 1M) | $15/1M (50% Off) | $5/1M (50% Off) | Anthropic: Claude Fable 5 |
| Context Window / Max Output | 1025K In / 125K Out | 977K In / 125K Out | OpenAI: GPT-5.5 Pro |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT-5.5 Pro (-0ms) |
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K
Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning sup
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 OpenAI: GPT-5.5 Pro to Anthropic: Claude Fable 5
Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning sup Verified P90 latency of 280ms.