gpt-4o-mini vs gpt-oss-120b
OpenAI against Cerebras, priced on the same four workloads with price book 2026-10-22.
On real workloads
| Workload | gpt-4o-mini per call | gpt-oss-120b per call | Monthly difference |
|---|---|---|---|
| Chat reply 1,500 input and 400 output tokens, 100,000 calls a month |
$0.000465 | $0.000825 | $36.00 |
| RAG answer, cached context 2,000 fresh + 4,000 cached input, 500 output, 100,000 calls a month |
$0.0009 | $0.00248 | $157.50 |
| Agent step 4,000 fresh + 8,000 cached input, 800 output, 250,000 calls a month |
$0.00168 | $0.0048 | $780.00 |
| Batch summary 3,000 input and 300 output tokens via the Batch API, 1,000,000 calls a month |
$0.000315 | — | — |
Monthly difference is gpt-oss-120b minus gpt-4o-mini. Batch rows use each provider's Batch API rates where published. Price both on your own workload.
Rates
| Model | Input | Output | Cache read | Cache write | Context |
|---|---|---|---|---|---|
| openai/gpt-4o-mini | $0.15 | $0.60 | $0.075 | — | 128K |
| cerebras/gpt-oss-120b | $0.35 | $0.75 | — | — | 131.1K |
Price is one input. Before switching, run your own prompts through both and compare quality; then veqen diff prices the change at your production volume.