Anthropic: Claude Fable 5 vs OpenAI: GPT-4o (2024-05-13): Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing Anthropic: Claude Fable 5 (anthropic/claude-fable-5) vs OpenAI: GPT-4o (2024-05-13) (openai/gpt-4o-2024-05-13). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
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).
OpenAI: GPT-4o (2024-05-13) (openai/gpt-4o-2024-05-13) 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 (API ID: anthropic/claude-fable-5) vs OpenAI: GPT-4o (2024-05-13) (API ID: openai/gpt-4o-2024-05-13), OpenAI: GPT-4o (2024-05-13) offers lower standard input pricing at $5/1M tokens ($15/1M output), while OpenAI: GPT-4o (2024-05-13) leads in cached prefix economics at $2.5/1M tokens (50% discount). Anthropic: Claude Fable 5 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 | OpenAI: GPT-4o (2024-05-13) | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | anthropic/claude-fable-5 | openai/gpt-4o-2024-05-13 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $10 / $50 | $5 / $15 | OpenAI: GPT-4o (2024-05-13) |
| Cache Read Price (per 1M) | $5/1M (50% Off) | $2.5/1M (50% Off) | OpenAI: GPT-4o (2024-05-13) |
| Context Window / Max Output | 977K In / 125K Out | 125K In / 4K Out | Anthropic: Claude Fable 5 |
| P90 First-Token / Edge Latency | 280ms | 280ms | Anthropic: Claude Fable 5 (-0ms) |
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
GPT-4o ("o" for "omni") is OpenAI's latest AI model, supporting both text and image inputs with text outputs. It maintains the intelligence level of [GPT-4 Turbo](/models/openai/gp
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 to OpenAI: GPT-4o (2024-05-13)
GPT-4o ("o" for "omni") is OpenAI's latest AI model, supporting both text and image inputs with text outputs. It maintains the intelligence level of [GPT-4 Turbo](/models/openai/gp Verified P90 latency of 280ms.