Gemini 3.1 Pro Preview vs GPT-5.6 Terra.
model vs model · prices as of
Gemini 3.1 Pro Preview and GPT-5.6 Terra split the 5 rounds this table counts: the two list price rows, the cheapest price we can explain, the standard price and context. The weighting you pick decides the rest.
GoogleGemini 3.1 Pro Preview
$9/M tokens
cheapest we can explain, at Kilo Gateway · $0.96 per 1,000 pages
1M context · tool calling · reads images
OpenAIGPT-5.6 Terra
$18/M tokens
OpenAI list price, nothing below it is accounted for · $1.92 per 1,000 pages
1.1M context · tool calling · reads images
List price in (lower wins)
$2/M
$2/M
List price out (lower wins)
$12/M
$12/M
Cheapest we can explain (lower wins)
$9/M at Kilo Gateway
none below list
Standard price (lower wins)
$18/M
$18/M
Cost per 1,000 pages (lower wins)
$0.96
$1.92
Context
1M tokens
1.1M tokens
Open weights
no
no
Tool calling
yes
yes
Structured output
yes
yes
Reads images
yes
yes
Reasoning
yes
yes
Released
19 Feb 2026
9 Jul 2026
Providers selling it
40
42
Price we measure against
the maker's own
the maker's own
Trains on your prompts (no is better)
not stated
no provider to check
Providers selling both · 29
Kilo Gateway$9 / $18
Jiekou$17.10 / $18
302.AI$18 / $18
Atlas Cloud$18 / $18
CrossModel$18 / $18
FastRouter$18 / $18
Impossibl$18 / $18
Inference.net$18 / $18
Gemini 3.1 Pro Preview then GPT-5.6 Terra, per million tokens · showing the 8 cheapest of 29
Go further
Add a third or fourth model, or switch the weighting, in the tool.
What moved in the last seven days
- Gemini 3.1 Pro Preview
Nous Portal$1.60 / $9.60 $2 / $1225% dearer · - GPT-5.6 TerraNous Portal$1.60 / $9.60 $2 / $1225% dearer ·
- GPT-5.6 Terra
Requesty$2 / $12 $2.20 / $13.2010% dearer · - GPT-5.6 Terra
Cortecs$2.30 / $13.81 $2.28 / $13.671.0% cheaper ·
Frequently asked
- Which is cheaper, Gemini 3.1 Pro Preview or GPT-5.6 Terra?
- Gemini 3.1 Pro Preview, at $9 per million tokens against $18 for GPT-5.6 Terra, three parts input to one part output, read on 16 Sept 2026.
- Where is each one cheapest?
- Gemini 3.1 Pro Preview: $9 at Kilo Gateway. GPT-5.6 Terra: nobody goes below the maker's own price with a reason we can point at, so $18 is the number to beat.
- Can I buy both from one provider?
- Yes. 29 providers sell both: Kilo Gateway, Jiekou, 302.AI, Atlas Cloud, CrossModel, FastRouter, and more. The cheapest of them for the two together is Kilo Gateway.
- Which holds more context?
- GPT-5.6 Terra, at 1.1M tokens against 1M.
Prices exclude tax and are per million tokens, read 16 Sept 2026 from each provider's own catalog. The standard price blends three parts input to one part output; a page is 600 tokens in and 60 out. Bars are scaled to the larger value in each row.