OpenAI: GPT-5.1-Codex-Max vs Anthropic: Claude Opus 4.8: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-5.1-Codex-Max (openai/gpt-5.1-codex-max) vs Anthropic: Claude Opus 4.8 (anthropic/claude-opus-4.8). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-5.1-Codex-Max (openai/gpt-5.1-codex-max) 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 Opus 4.8 (anthropic/claude-opus-4.8) — $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-5.1-Codex-Max (API ID: openai/gpt-5.1-codex-max) vs Anthropic: Claude Opus 4.8 (API ID: anthropic/claude-opus-4.8), OpenAI: GPT-5.1-Codex-Max offers lower standard input pricing at $1.25/1M tokens ($10/1M output), while OpenAI: GPT-5.1-Codex-Max leads in cached prefix economics at $0.625/1M tokens (50% discount). OpenAI: GPT-5.1-Codex-Max 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-5.1-Codex-Max | Anthropic: Claude Opus 4.8 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-5.1-codex-max | anthropic/claude-opus-4.8 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $1.25 / $10 | $5 / $25 | OpenAI: GPT-5.1-Codex-Max |
| Cache Read Price (per 1M) | $0.625/1M (50% Off) | $2.5/1M (50% Off) | OpenAI: GPT-5.1-Codex-Max |
| Context Window / Max Output | 391K In / 125K Out | 977K In / 125K Out | OpenAI: GPT-5.1-Codex-Max |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT-5.1-Codex-Max (-0ms) |
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasonin
Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M
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-5.1-Codex-Max to Anthropic: Claude Opus 4.8
Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M Verified P90 latency of 280ms.