OpenAI: GPT-5.2-Codex vs Anthropic Claude Fable 5.1: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-5.2-Codex (openai/gpt-5.2-codex) vs Anthropic Claude Fable 5.1 (claude-fable-5-1). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-5.2-Codex (openai/gpt-5.2-codex) 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 5.1 (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).
In Etuki October 2026 FinOps telemetry comparing OpenAI: GPT-5.2-Codex (API ID: openai/gpt-5.2-codex) vs Anthropic Claude Fable 5.1 (API ID: claude-fable-5-1), OpenAI: GPT-5.2-Codex offers lower standard input pricing at $1.75/1M tokens ($14/1M output), while Anthropic Claude Fable 5.1 leads in cached prefix economics at $0.25/1M tokens (97.5% discount). OpenAI: GPT-5.2-Codex achieves a 210ms faster P90 time-to-first-token latency (280ms vs 490ms).
Auto-discovered via live global telemetry registry.
Enable Prompt Context Caching & Batch API to reduce repeated system prompt input token burn by 50%-97.5%.
| Specification / FinOps Dimension | OpenAI: GPT-5.2-Codex | Anthropic Claude Fable 5.1 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-5.2-codex | claude-fable-5-1 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $1.75 / $14 | $10 / $50 | OpenAI: GPT-5.2-Codex |
| Cache Read Price (per 1M) | $0.875/1M (50% Off) | $0.25/1M (97.5% Off) | Anthropic Claude Fable 5.1 |
| Context Window / Max Output | 391K In / 125K Out | 1000K In / 128K Out | Anthropic Claude Fable 5.1 |
| P90 First-Token / Edge Latency | 280ms | 490ms | OpenAI: GPT-5.2-Codex (-210ms) |
GPT-5.2-Codex is an upgraded version of GPT-5.1-Codex optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, in
Anthropic specialized frontier model for demanding scientific reasoning, OfficeQA leadership, and long-horizon agentic work.
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-5.2-Codex to Anthropic Claude Fable 5.1
Anthropic specialized frontier model for demanding scientific reasoning, OfficeQA leadership, and long-horizon agentic work. Verified P90 latency of 490ms.