OpenAI: GPT Chat Latest vs xAI: Grok Latest: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT Chat Latest (openai/gpt-chat-latest) vs xAI: Grok Latest (~x-ai/grok-latest). 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).
xAI: Grok Latest (~x-ai/grok-latest) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for xAI: Grok Latest: Activate ephemeral prefix caching to slash input costs by 50% (down to $1/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing OpenAI: GPT Chat Latest (API ID: openai/gpt-chat-latest) vs xAI: Grok Latest (API ID: ~x-ai/grok-latest), xAI: Grok Latest offers lower standard input pricing at $2/1M tokens ($6/1M output), while xAI: Grok Latest leads in cached prefix economics at $1/1M 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 | xAI: Grok Latest | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-chat-latest | ~x-ai/grok-latest | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $5 / $30 | $2 / $6 | xAI: Grok Latest |
| Cache Read Price (per 1M) | $2.5/1M (50% Off) | $1/1M (50% Off) | xAI: Grok Latest |
| Context Window / Max Output | 391K In / 125K Out | 488K In / 439K Out | xAI: Grok 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
This model always redirects to the latest Grok model from xAI.
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 xAI: Grok Latest
This model always redirects to the latest Grok model from xAI. Verified P90 latency of 280ms.