Claude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/MClaude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/M
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Gemini 3.1 Pro Preview Custom Tools

text+image+file+audio+video->text

Gemini 3.1 Pro Preview Custom Tools sits in the frontier tier — built for high-capability reasoning, tool use, and long-form output where capability outweighs cost. Available via Google. 1.0M-token context. Premium pricing. Currently in preview — capabilities and pricing may shift.

Gemini 3.1 Pro Preview Custom Tools is a multimodal AI model from Google. It costs $2.000 per million input tokens and $12.000 per million output tokens (blended $5.000/M), with a 1.0M-token context window.

Modalities text, vision, audio, videoProvider pricing ↗API docs ↗Pricing source ↗Compare with another model →Estimate monthly cost →
INPUT
$2.000/M
per million input tokens
OUTPUT
$12.000/M
per million output tokens
BLENDED 70/30
$5.000/M
default reference rate · how it's calculated →
CONTEXT
1.0M
1,048,756 tokens
What it's good at
  • Strong general reasoning
  • Tool use & function calling
  • Long-form writing
  • Production-grade reliability
  • Multimodal: handles images alongside text
Typical use cases
  • Production assistants
  • Long-document analysis
  • Multi-step agent workflows
  • Engineering copilots
Benchmarks
No published benchmark scores tracked for this model yet. Frontier and reasoning models from major providers have scores; smaller models and inference-host variants typically inherit the underlying open-weights score.
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in $1.500/Mout $9.000/M
Gemini 3.1 Pro
Frontier · 1M ctx
in $2.000/Mout $12.000/M
Gemini 3 Pro
Frontier · 1M ctx
in $2.000/Mout $12.000/M
Gemini 3 Flash
Efficient · 1M ctx
in $0.500/Mout $3.000/M
Gemini 2.5 Pro
Frontier · 1M ctx
in $1.250/Mout $10.000/M
Frequently asked questions

How much does Gemini 3.1 Pro Preview Custom Tools cost?

Gemini 3.1 Pro Preview Custom Tools costs $2.000 per million input tokens and $12.000 per million output tokens, for a blended reference rate of $5.000 per million tokens.

What is Gemini 3.1 Pro Preview Custom Tools's context window?

Gemini 3.1 Pro Preview Custom Tools supports up to 1.0M tokens of context (1,048,756 tokens).

What is Gemini 3.1 Pro Preview Custom Tools best for?

Gemini 3.1 Pro Preview Custom Tools is well suited to Strong general reasoning, Tool use & function calling and Long-form writing.

Who makes Gemini 3.1 Pro Preview Custom Tools?

Gemini 3.1 Pro Preview Custom Tools is developed and served by Google.