OpenAI: GPT Chat Latest vs OpenAI: GPT-5.5 Pro (batch): Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT Chat Latest (openai/gpt-chat-latest) vs OpenAI: GPT-5.5 Pro (batch) (openai/gpt-5.5-pro:batch). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT Chat Latest (openai/gpt-chat-latest) 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-5.5 Pro (batch) (openai/gpt-5.5-pro:batch) 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 Chat Latest (API ID: openai/gpt-chat-latest) vs OpenAI: GPT-5.5 Pro (batch) (API ID: openai/gpt-5.5-pro:batch), OpenAI: GPT Chat Latest offers lower standard input pricing at $5/1M tokens ($30/1M output), while OpenAI: GPT Chat Latest leads in cached prefix economics at $2.5/1M tokens (50% discount). OpenAI: GPT Chat Latest 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 Chat Latest | OpenAI: GPT-5.5 Pro (batch) | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-chat-latest | openai/gpt-5.5-pro:batch | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $5 / $30 | $15 / $90 | OpenAI: GPT Chat Latest |
| Cache Read Price (per 1M) | $2.5/1M (50% Off) | $7.5/1M (50% Off) | OpenAI: GPT Chat Latest |
| Context Window / Max Output | 391K In / 125K Out | 1025K In / 125K Out | OpenAI: GPT Chat Latest |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT Chat Latest (-0ms) |
GPT Chat Latest points to OpenAI's stable API alias `chat-latest` that always resolves to the latest Instant chat model used in ChatGPT. As OpenAI rolls out new Instant model updat
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
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 Chat Latest to OpenAI: GPT-5.5 Pro (batch)
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 Verified P90 latency of 280ms.