OpenAI GPT-6.1 Sol vs xAI Grok 4.3: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI GPT-6.1 Sol (gpt-6.1-sol) vs xAI Grok 4.3 (grok-4.3). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI & Microsoft Founders Hub ($2,500–$150,000 Credits) + 50% Batch API Discount
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 4.3 (grok-4.3) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for xAI Grok 4.3: 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-6.1 Sol (API ID: gpt-6.1-sol) vs xAI Grok 4.3 (API ID: grok-4.3), OpenAI GPT-6.1 Sol offers lower standard input pricing at $2/1M tokens ($10/1M output), while OpenAI GPT-6.1 Sol leads in cached prefix economics at $0.5/1M tokens (75% discount). xAI Grok 4.3 achieves a 90ms faster P90 time-to-first-token latency (180ms vs 270ms).
Context Cliff Alert: Prompts exceeding 272K tokens double in price from $2/$10 to $4/$15 per 1M tokens.
Enable Prompt Context Caching & Batch API to reduce repeated system prompt input token burn by 50%-97.5%.
| Specification / FinOps Dimension | OpenAI GPT-6.1 Sol | xAI Grok 4.3 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | gpt-6.1-sol | grok-4.3 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $2 / $10 | $2 / $10 | OpenAI GPT-6.1 Sol |
| Cache Read Price (per 1M) | $0.5/1M (75% Off) | $1/1M (50% Off) | OpenAI GPT-6.1 Sol |
| Context Window / Max Output | 1000K In / 128K Out | 512K In / 128K Out | OpenAI GPT-6.1 Sol |
| P90 First-Token / Edge Latency | 270ms | 180ms | xAI Grok 4.3 (-90ms) |
OpenAI October 2026 flagship reasoning & coding model delivering near-Astra intelligence at 1/5th the cost.
xAI October 2026 frontier reasoning model with live X/Web grounding and sub-200ms latency.
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-6.1 Sol to xAI Grok 4.3
xAI October 2026 frontier reasoning model with live X/Web grounding and sub-200ms latency. Verified P90 latency of 180ms.