Gemini 3.1 Pro vs GPT-5.4
Google against OpenAI, costed on the same three workloads. Gemini 3.1 Pro is cheaper on all three workloads.
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Monthly bill, side by side
| Workload | Gemini 3.1 Pro | GPT-5.4 | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$8,865 | $11,081 | $2,216 (+25%) |
| Document summarizer 1,000 single-shot summaries a day |
$1,020 | $1,275 | $255 (+25%) |
| Coding agent 200 twelve-turn sessions a day |
$5,976 | $7,470 | $1,494 (+25%) |
No prompt caching and no batch discount on either side, so the comparison is like for like. Both figures assume 30 days a month.
The rate cards
| Gemini 3.1 Pro | GPT-5.4 | |
|---|---|---|
| Input, per 1M tokens | $2 | $2.5 |
| Output, per 1M tokens | $12 | $15 |
| Cached input | $0.2 | $0.25 |
| Context window | 1.05M | 1.05M |
| Maximum output | 66K | 128K |
| Reasoning model | yes | yes |
| Vision | yes | yes |
Beyond the price
- GPT-5.4 can write up to 128K tokens in one response, against 66K for Gemini 3.1 Pro.
- Only GPT-5.4 offers a batch discount — 50% off both rates for work that can wait.
Run this comparison on your own numbers
Full detail: Gemini 3.1 Pro pricing · GPT-5.4 pricing
More comparisons
Other head-to-heads that include Gemini 3.1 Pro or GPT-5.4.
- Gemini 3.1 Pro vs Claude Opus 4.6
- Gemini 3.1 Pro vs Claude Opus 4.7
- Gemini 3.1 Pro vs Claude Opus 4.8
- GPT-5.4 vs Claude Opus 4.6
- GPT-5.4 vs Claude Sonnet 4.6
- GPT-5.4 vs Claude Sonnet 5.5
Common questions
Which is cheaper, Gemini 3.1 Pro or GPT-5.4?
Gemini 3.1 Pro is cheaper on all three workloads.
How much would Gemini 3.1 Pro and GPT-5.4 cost each month?
On PromptSpend's standard workloads, per month: support chatbot: Gemini 3.1 Pro $8,865, GPT-5.4 $11,081 (Gemini 3.1 Pro is cheaper by $2,216); document summarizer: Gemini 3.1 Pro $1,020, GPT-5.4 $1,275 (Gemini 3.1 Pro is cheaper by $255); coding agent: Gemini 3.1 Pro $5,976, GPT-5.4 $7,470 (Gemini 3.1 Pro is cheaper by $1,494). No prompt caching and no batch discount is assumed.
How do Gemini 3.1 Pro and GPT-5.4 differ apart from price?
GPT-5.4 can write up to 128K tokens in one response, against 66K for Gemini 3.1 Pro. Only GPT-5.4 offers a batch discount — 50% off both rates for work that can wait.