gpt-4o vs gpt-4.1
OpenAI against OpenAI, priced on the same four workloads with price book 2026-10-22.
On real workloads
| Workload | gpt-4o per call | gpt-4.1 per call | Monthly difference |
|---|---|---|---|
| Chat reply 1,500 input and 400 output tokens, 100,000 calls a month |
$0.00775 | $0.0062 | −$155.00 |
| RAG answer, cached context 2,000 fresh + 4,000 cached input, 500 output, 100,000 calls a month |
$0.01 | $0.01 | −$500.00 |
| Agent step 4,000 fresh + 8,000 cached input, 800 output, 250,000 calls a month |
$0.03 | $0.02 | −$2,400.00 |
| Batch summary 3,000 input and 300 output tokens via the Batch API, 1,000,000 calls a month |
$0.00525 | $0.0042 | −$1,050.00 |
Monthly difference is gpt-4.1 minus gpt-4o. 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 | $2.50 | $10.00 | $1.25 | — | 128K |
| openai/gpt-4.1 | $2.00 | $8.00 | $0.50 | — | 1M |
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.