Gemini 3 Flash
Provider list prices: no platform markup, pay-as-you-go. These are official list prices. Logged-in customers may see effective prices including workspace discounts on /console/pricing. Effective input at a 70% cache-hit rate:$0.185/M. Implicit caching is on by default for current Gemini models (discounted automatically on cache hits), plus an explicit CachedContent API with storage-based billing for guaranteed savings.
Use Gemini 3 Flash in 30 seconds
OpenAI-compatible: swap the base_url, keep your SDK. POST /v1/chat/completions
from openai import OpenAI
client = OpenAI(
base_url="https://synthorai.io/v1",
api_key="sk-syn-...",
)
resp = client.chat.completions.create(
model="gemini-3-flash-preview",
messages=[{"role": "user", "content": "Summarize this diff"}],
reasoning_effort="medium",
)
print(resp.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://synthorai.io/v1",
apiKey: "sk-syn-...",
});
const resp = await client.chat.completions.create({
model: "gemini-3-flash-preview",
messages: [{ role: "user", content: "Summarize this diff" }],
reasoning_effort: "medium",
});
console.log(resp.choices[0].message.content);curl https://synthorai.io/v1/chat/completions \
-H "Authorization: Bearer sk-syn-..." \
-H "Content-Type: application/json" \
-d '{
"model": "gemini-3-flash-preview",
"messages": [{"role": "user", "content": "Hello"}],
"reasoning_effort": "medium"
}'package main
import (
"context"
"fmt"
"github.com/openai/openai-go/v3"
"github.com/openai/openai-go/v3/option"
)
func main() {
client := openai.NewClient(
option.WithBaseURL("https://synthorai.io/v1"),
option.WithAPIKey("sk-syn-..."),
)
resp, _ := client.Chat.Completions.New(context.TODO(), openai.ChatCompletionNewParams{
Model: "gemini-3-flash-preview",
Messages: []openai.ChatCompletionMessageParamUnion{
openai.UserMessage("Summarize this diff"),
},
ReasoningEffort: openai.ReasoningEffortMedium,
})
fmt.Println(resp.Choices[0].Message.Content)
}import com.openai.client.OpenAIClient;
import com.openai.client.okhttp.OpenAIOkHttpClient;
import com.openai.models.chat.completions.*;
import com.openai.models.ReasoningEffort;
OpenAIClient client = OpenAIOkHttpClient.builder()
.baseUrl("https://synthorai.io/v1")
.apiKey("sk-syn-...")
.build();
ChatCompletion resp = client.chat().completions().create(
ChatCompletionCreateParams.builder()
.model("gemini-3-flash-preview")
.addUserMessage("Summarize this diff")
.reasoningEffort(ReasoningEffort.MEDIUM)
.build());
System.out.println(resp.choices().get(0).message().content().orElse(""));About Gemini 3 Flash
Gemini 3 Flash (preview) is the model Google's documentation describes as the best in the world for multimodal understanding, pairing state-of-the-art reasoning with strong agentic and creative-coding performance.
- It accepts text, image, video, audio, and PDF input within a 1,048,576-token context window and produces up to 65,536 output tokens, with thinking supported throughout.
- Capabilities include function calling, code execution, computer use, search and Maps grounding, structured outputs, and context caching.
- Synthorai offers it via its unified OpenAI-compatible chat completions interface.
Specs & limits
| Max output (vendor spec) | 65,536 |
| Modalities | text + image + video + audio → text |
| Features | tools · structured_output · streaming · vision · batch · caching · reasoning · computer_use |
| Notable | Preview model; 1,048,576-token input; computer use supported; image generation NOT supported despite gateway capability tag. |
| Prompt caching | automatic + explicit · min 1,024-token prefix |
FAQ
Is the Gemini 3 Flash API free to try?
Yes: new accounts get 10 trial calls and up to $1 in free credit, no card required. At $0.5/M input tokens, that credit alone covers roughly 250 requests of ~8K tokens against Gemini 3 Flash.
What is Gemini 3 Flash best at?
Described as best for multimodal understanding, plus state-of-the-art reasoning with creative-coding strength and computer use and Maps grounding support. See the About section for the full picture from the vendor's own release notes.
How much does Gemini 3 Flash cost?
Gemini 3 Flash costs $0.5 per million input tokens and $3 per million output tokens on Synthorai. That is the provider's list price, with no platform markup. Cached input tokens bill at $0.05/M.
Does Gemini 3 Flash support prompt caching?
Yes: automatic caching is on by default, with an explicit mode for guaranteed savings. Cached input tokens bill at $0.05/M vs $0.5/M uncached; prompts need a 1,024-token stable prefix to cache. Prompt caching guide →
How do I get access to Gemini 3 Flash?
Point your existing OpenAI SDK at base_url="https://synthorai.io/v1", set model="gemini-3-flash-preview", and you're done. One API key covers every model on the gateway.
What is Gemini 3 Flash's knowledge cutoff?
Gemini 3 Flash's knowledge cutoff is 2025-01, per the vendor's official documentation (as of 2026-07-09).