Microsoft: Phi 4 vs OpenAI: GPT-6.1 Sol Pro (batch): Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing Microsoft: Phi 4 (microsoft/phi-4) vs OpenAI: GPT-6.1 Sol Pro (batch) (openai/gpt-6.1-sol-pro:batch). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
Microsoft: Phi 4 (microsoft/phi-4) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Microsoft: Phi 4: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.035/1M) or route via asynchronous Batch API for 50% off standard token rates.
OpenAI: GPT-6.1 Sol Pro (batch) (openai/gpt-6.1-sol-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 Microsoft: Phi 4 (API ID: microsoft/phi-4) vs OpenAI: GPT-6.1 Sol Pro (batch) (API ID: openai/gpt-6.1-sol-pro:batch), Microsoft: Phi 4 offers lower standard input pricing at $0.07/1M tokens ($0.14/1M output), while Microsoft: Phi 4 leads in cached prefix economics at $0.035/1M tokens (50% discount). Microsoft: Phi 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 | Microsoft: Phi 4 | OpenAI: GPT-6.1 Sol Pro (batch) | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | microsoft/phi-4 | openai/gpt-6.1-sol-pro:batch | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $0.07 / $0.14 | $1 / $5 | Microsoft: Phi 4 |
| Cache Read Price (per 1M) | $0.035/1M (50% Off) | $0.5/1M (50% Off) | Microsoft: Phi 4 |
| Context Window / Max Output | 16K In / 14K Out | 1025K In / 125K Out | OpenAI: GPT-6.1 Sol Pro (batch) |
| P90 First-Token / Edge Latency | 280ms | 280ms | Microsoft: Phi 4 (-0ms) |
[Microsoft Research](/microsoft) Phi-4 is designed to perform well in complex reasoning tasks and can operate efficiently in situations with limited memory or where quick responses
GPT-6.1 Sol Pro is the same underlying model as [GPT-6.1 Sol](https://openrouter.ai/openai/gpt-6.1-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on c
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 Microsoft: Phi 4 to OpenAI: GPT-6.1 Sol Pro (batch)
GPT-6.1 Sol Pro is the same underlying model as [GPT-6.1 Sol](https://openrouter.ai/openai/gpt-6.1-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on c Verified P90 latency of 280ms.