OpenAI: GPT-4 vs OpenAI: GPT-5.1: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-4 (openai/gpt-4) vs OpenAI: GPT-5.1 (openai/gpt-5.1). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-4 (openai/gpt-4) 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-5.1 (openai/gpt-5.1) 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-4 (API ID: openai/gpt-4) vs OpenAI: GPT-5.1 (API ID: openai/gpt-5.1), OpenAI: GPT-5.1 offers lower standard input pricing at $1.25/1M tokens ($10/1M output), while OpenAI: GPT-5.1 leads in cached prefix economics at $0.625/1M tokens (50% discount). OpenAI: GPT-4 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-4 | OpenAI: GPT-5.1 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-4 | openai/gpt-5.1 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $30 / $60 | $1.25 / $10 | OpenAI: GPT-5.1 |
| Cache Read Price (per 1M) | $15/1M (50% Off) | $0.625/1M (50% Off) | OpenAI: GPT-5.1 |
| Context Window / Max Output | 8K In / 4K Out | 391K In / 125K Out | OpenAI: GPT-5.1 |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT-4 (-0ms) |
OpenAI's flagship model, GPT-4 is a large-scale multimodal language model capable of solving difficult problems with greater accuracy than previous models due to its broader genera
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style
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-4 to OpenAI: GPT-5.1
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style Verified P90 latency of 280ms.