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Google LLC (Vertex AI)

gemini-3.1-flash-image:flex

Gemini 3.1 Flash Image is optimized for image understanding and generation and offers a balance of price and performance.

VisionReasoningTool callingCachingWeb searchImage gen
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Specifications

Context window131K tokens
Max output33K tokens
API typechat
AddedAug 14, 2026
Model ID
Data retentionNo
Used for trainingNo
Provider location🇺🇸 US
Privacy policyVertex AI Data Governance→

Benchmarks

Benchmarks haven't been published yet for this exact variant.

Some variants (region-specific deployments, highspeed tiers) share benchmarks with their base model. Check the base model page or the Google LLC (Vertex AI) models overview.

Pricing

Prices updated August 14, 2026
Input / 1M
$0.25
Output / 1M
$1.50
Cache write
N/A
Cache read
N/A
Estimated cost
100K input + 10K output$0.0400
1M input + 100K output$0.40
10M input + 1M output$4.00

Requesty charges exactly what the upstream provider charges, no markup, no per-request fees. Prompt caching and smart routing can reduce effective cost by 30-80%.

Quickstart

Drop-in compatible with the OpenAI SDK. Change the base URL, swap in your Requesty API key, and set the model to vertex/gemini-3.1-flash-image:flex.

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from openai import OpenAI

client = OpenAI(
    api_key="YOUR_REQUESTY_API_KEY",
    base_url="https://router.requesty.ai/v1",
)

response = client.chat.completions.create(
    model="vertex/gemini-3.1-flash-image:flex",
    messages=[
        {"role": "user", "content": "Explain quantum computing in one paragraph."},
    ],
)

print(response.choices[0].message.content)

Other Google LLC (Vertex AI) models

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gemini-3-pro-image:flex
1.0M ctx$1.00/1M
gemini-3.1-flash-lite:flex
1.0M ctx$0.13/1M
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gemini-3.5-flash-lite:flex
1.0M ctx$0.15/1M
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gemini-3.5-flash:flex
1.0M ctx$0.75/1M
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gemini-3.7-flash
@eu
1.0M ctx$0.75/1M
Coding 76

Frequently asked questions

How much does gemini-3.1-flash-image:flex cost?
gemini-3.1-flash-image:flex is priced at $0.25 per million input tokens and $1.50 per million output tokens when accessed via Requesty. Prompt caching is supported, which can cut effective input cost by up to 90% on repeated context. Requesty charges exactly what the upstream provider charges, we don't add markup.
What is the context window of gemini-3.1-flash-image:flex?
gemini-3.1-flash-image:flex has a context window of 131K tokens, with a maximum output of 33K tokens per response. That's roughly 175 words of input you can fit in a single prompt.
What can gemini-3.1-flash-image:flex do?
gemini-3.1-flash-image:flex supports vision input, tool calling, extended reasoning, prompt caching, web search, image generation. You can call it through any OpenAI-compatible client by pointing base_url to Requesty.
How do I use gemini-3.1-flash-image:flex with the OpenAI SDK?
Install the OpenAI SDK, set base_url to "https://router.requesty.ai/v1", set your API key to your Requesty key, and set the model to "vertex/gemini-3.1-flash-image:flex". The Quickstart above shows Python, JavaScript and cURL snippets.
Can I run gemini-3.1-flash-image:flex through Requesty?
Yes. gemini-3.1-flash-image:flex runs through Requesty's OpenAI-compatible API, served from Google LLC (Vertex AI). You do not host the model yourself: point base_url at Requesty, set the model to "vertex/gemini-3.1-flash-image:flex", and requests are routed to the upstream provider with automatic failover. The same key gives you 600+ other models too.

Access gemini-3.1-flash-image:flex through Requesty

One API key, 600+ models, OpenAI-compatible. No markup on provider prices, automatic failover, and smart caching built-in.

All Google LLC (Vertex AI) models