OpenAI: GPT-5.5 Pro vs OpenAI GPT-6 Luna: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-5.5 Pro (openai/gpt-5.5-pro) vs OpenAI GPT-6 Luna (gpt-6-luna). 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).
OpenAI GPT-6 Luna (gpt-6-luna) 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 OpenAI: GPT-5.5 Pro (API ID: openai/gpt-5.5-pro) vs OpenAI GPT-6 Luna (API ID: gpt-6-luna), OpenAI GPT-6 Luna offers lower standard input pricing at $0.1/1M tokens ($0.5/1M output), while OpenAI GPT-6 Luna leads in cached prefix economics at $0.025/1M tokens (75% discount). OpenAI GPT-6 Luna achieves a 135ms faster P90 time-to-first-token latency (145ms vs 280ms).
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-5.5 Pro | OpenAI GPT-6 Luna | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-5.5-pro | gpt-6-luna | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $30 / $180 | $0.1 / $0.5 | OpenAI GPT-6 Luna |
| Cache Read Price (per 1M) | $15/1M (50% Off) | $0.025/1M (75% Off) | OpenAI GPT-6 Luna |
| Context Window / Max Output | 1025K In / 125K Out | 1000K In / 64K Out | OpenAI: GPT-5.5 Pro |
| P90 First-Token / Edge Latency | 280ms | 145ms | OpenAI GPT-6 Luna (-135ms) |
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
OpenAI ultra-affordable reasoning and logic model with 1M+ token context window for high-volume production pipelines.
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 OpenAI GPT-6 Luna
OpenAI ultra-affordable reasoning and logic model with 1M+ token context window for high-volume production pipelines. Verified P90 latency of 145ms.