Gemini 3.1 Pro Preview vs Gemini 3.1 Pro Preview Custom Tools
Prices checked
Gemini 3.1 Pro Preview takes 1 of 5 rounds against Gemini 3.1 Pro Preview Custom Tools. It is also the cheaper of the two to run, at $2.25 per million tokens against $4.50.
GoogleWins 1 roundGemini 3.1 Pro Preview
1M context · tool calling · reads images
$2.25/M tokensCheapest price, at Kilo Gateway · $0.96 per 1,000 pages
GoogleGemini 3.1 Pro Preview Custom Tools
1M context · tool calling · reads images
$4.50/M tokensGoogle's own price · $1.92 per 1,000 pages
Maker's price in (lower wins)
$2/M
$2/M
Maker's price out (lower wins)
$12/M
$12/M
Cheapest price (lower wins)
$2.25/M at Kilo Gateway
none below the maker
Maker's price, blended (lower wins)
$4.50/M
$4.50/M
Cost per 1,000 pages (lower wins)
$0.96
$1.92
Context
1M tokens
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
19 Feb 2026
Providers selling it
44
13
Price we measure against
the maker's own
the maker's own
Trains on your prompts (no is better)
not published
no provider to check
Providers selling both · 13
Kilo Gateway$2.25 / $4.50
AIHubMix$4.50 / $4.50
Eden AI$4.50 / $4.50- Google$4.50 / $4.50
Google Vertex AI$4.50 / $4.50
LLMTR$4.50 / $4.50
Merge Gateway$4.50 / $4.50
NanoGPT$4.50 / $4.50
Gemini 3.1 Pro Preview, then Gemini 3.1 Pro Preview Custom Tools, per million tokens; the 8 cheapest of 13.
Go further
Add a third or fourth model, or change the weighting, in the tool.
What moved this week
AI/ML API · 23% cheaper ·
$2 / $12 $2.60 / $15.60
Frequently asked
- Which is cheaper, Gemini 3.1 Pro Preview or Gemini 3.1 Pro Preview Custom Tools?
- Gemini 3.1 Pro Preview, at $2.25 per million tokens against $4.50 for Gemini 3.1 Pro Preview Custom Tools, blended 3 in : 1 out, read on 31 Oct 2026.
- Where is each one cheapest?
- Gemini 3.1 Pro Preview: $2.25 at Kilo Gateway. Gemini 3.1 Pro Preview Custom Tools: nobody sells it below the maker's own price with a stated reason, so $4.50 is the number to beat.
- Can I buy both from one provider?
- Yes. 13 providers sell both: Kilo Gateway, AIHubMix, Eden AI, Google, Google Vertex AI, LLMTR, and more. The cheapest of them for the two together is Kilo Gateway.
- Which holds more context?
- Both hold 1M tokens in one call.
Prices exclude tax, read 31 Oct 2026 from each provider's own catalog. They are per M tokens, blended 3 in : 1 out, and a page is 600 tokens in and 60 out. Bars are scaled to the larger value in each row.
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