GPT-5.5 vs Gemini 3.1 Pro Preview: API pricing comparison
OpenAI GPT-5.5 vs Google Gemini 3.1 Pro Preview: token prices, batch and cache rates, Arena ELO, and cost per request for 8 business use cases. Prices in USD per 1 million tokens. Data snapshot: 2026-11-12.
GPT-5.5 vs Gemini 3.1 Pro Preview: the short version
At the prices we quote, Gemini 3.1 Pro Preview costs less than GPT-5.5 on input and on output: $2.00 against $5.00 per 1M input tokens (60% less), and $12.00 against $30.00 per 1M output tokens (60% less). With the Support Ticket profile (1,500 input and 500 output tokens per request), 1,000 requests cost $22.50 on GPT-5.5 and $9.00 on Gemini 3.1 Pro Preview at list price, 60% less on Gemini 3.1 Pro Preview. On Arena ELO, Gemini 3.1 Pro Preview scores 1480 and GPT-5.5 scores 1466, 14 points apart (scores as of 2026-11-08). The context window is 1M tokens on both. Both are recorded here as proprietary, with access through an API. Prices as quoted on 2026-11-12. Each price is the list price of one host, the one we quote for that model. A model sold by several hosts has other prices, listed on its model page.
GPT-5.5 pricing (OpenAI)
- Input: $5.00 per 1M tokens
- Output: $30.00 per 1M tokens
- Batch API (input/output): $2.50 / $15.00
- Prompt-cache read: $0.50
- Context window: 1M
- Arena ELO: 1466 (as of 2026-11-08)
- Full GPT-5.5 pricing page
Gemini 3.1 Pro Preview pricing (Google)
- Input: $2.00 per 1M tokens
- Output: $12.00 per 1M tokens
- Batch API (input/output): $1.00 / $6.00
- Prompt-cache read: $0.20
- Context window: 1M
- Arena ELO: 1480 (as of 2026-11-08)
- Full Gemini 3.1 Pro Preview pricing page
Cost per 1,000 requests by business use case
List price vs after discounts (prompt caching on the cached input share, batch API for async workloads, only where the provider publishes those rates).
| Use case | Tokens (in/out) | GPT-5.5 list price | GPT-5.5 after discounts | Gemini 3.1 Pro Preview list price | Gemini 3.1 Pro Preview after discounts |
|---|---|---|---|---|---|
| Support Ticket | 1,500 / 500 | $22.50 | $18.45 | $9.00 | $7.38 |
| Knowledge Q&A | 2,000 / 800 | $34.00 | $27.70 | $13.60 | $11.08 |
| Meeting Summary | 10,000 / 1,200 | $86.00 | $41.00 | $34.40 | $16.40 |
| Marketing Content | 2,500 / 1,800 | $66.50 | $64.25 | $26.60 | $25.70 |
| Coding Task | 3,000 / 2,000 | $75.00 | $68.25 | $30.00 | $27.30 |
| Invoice Processing | 1,500 / 600 | $25.50 | $11.85 | $10.20 | $4.74 |
| Call Summary | 2,000 / 700 | $31.00 | $15.10 | $12.40 | $6.04 |
| Agent Workflow | 6,000 / 3,000 | $120.00 | $101.10 | $48.00 | $40.44 |
Common questions about GPT-5.5 vs Gemini 3.1 Pro Preview
- Which is cheaper, GPT-5.5 or Gemini 3.1 Pro Preview?
- At the prices we quote, Gemini 3.1 Pro Preview costs less than GPT-5.5 on input and on output: $2.00 against $5.00 per 1M input tokens (60% less), and $12.00 against $30.00 per 1M output tokens (60% less). Prices as quoted on 2026-11-12. Each price is the list price of one host, the one we quote for that model. A model sold by several hosts has other prices, listed on its model page.
- What do 1,000 Support Ticket requests cost on GPT-5.5 and on Gemini 3.1 Pro Preview?
- With the Support Ticket profile (1,500 input and 500 output tokens per request), 1,000 requests cost $22.50 on GPT-5.5 and $9.00 on Gemini 3.1 Pro Preview at list price, 60% less on Gemini 3.1 Pro Preview. Prices as quoted on 2026-11-12.
- How do GPT-5.5 and Gemini 3.1 Pro Preview compare on Arena score, context window and licence?
- On Arena ELO, Gemini 3.1 Pro Preview scores 1480 and GPT-5.5 scores 1466, 14 points apart (scores as of 2026-11-08). The context window is 1M tokens on both. Both are recorded here as proprietary, with access through an API.
Open this comparison in the interactive compare tool: add up to two more models, copy a shareable link, or export the table as CSV.
These are list prices: real cost also depends on caching, batching, negotiated discounts, marketplace agreements, and existing contracts. Get a FinOps review from OptimNow or compare all models.