GPT-4o → Gemini 3.1 Pro: cost per request on six tasks
Gemini 3.1 Pro costs between 18% less and 11% more than GPT-4o per request on six common tasks. It costs no more per result that works if its results work first time at least 82% as often as GPT-4o's on search re-ranking, and 12% more often on translation. OpenAI has announced GPT-4o's API shutdown for 2027-01-14.
List prices per million tokens
| Model | Input | Cached input | Output |
|---|---|---|---|
| GPT-4o | $2.50 | $1.25 | $10.00 |
| Gemini 3.1 Pro | $2.00 | $0.20 | $12.00 |
Prices checked 2026-11-12.
Cost per 1,000 requests
| Task | GPT-4o | Gemini 3.1 Pro | Change | Cheaper per result that works if it works first time at least |
|---|---|---|---|---|
| Support bot answerInstructions, three help-centre passages and the customer's question in; a short answer out. | $10.50 | $9.60 | 9% less | 92% as often as GPT-4o |
| Invoice field extractionInstructions and one invoice's text in; about 15 fields as JSON out. | $8.75 | $8.00 | 9% less | 92% as often as GPT-4o |
| Lead scoringScoring rules and one lead's form answers in; a score and a one-line reason out. | $4.00 | $3.60 | 10% less | 90% as often as GPT-4o |
| Email reply draftInstructions and the email thread so far in; a reply of about 300 words out. | $7.75 | $7.80 | 1% more | 1% more often than GPT-4o |
| TranslationInstructions and about 500 words of text in; the same text in another language out. | $10.25 | $11.40 | 11% more | 12% more often than GPT-4o |
| Search re-rankingA search query and 20 result snippets in; the ids of the best five, in order, out. | $10.50 | $8.60 | 18% less | 82% as often as GPT-4o |
Token counts are typical sizes, not measurements.
GPT-4o is being shut down
OpenAI has announced GPT-4o's API shutdown for 2027-01-14, with gpt-6-luna as the replacement (source).
Test it on your own prompt
The model switch test runs your prompt on both models side by side with your own API key, in your browser.