Gemini 3.5 Flash — FreePro-Level Agentic AI at Flash Speed
Gemini 3.5 Flash is Google DeepMind's fastest frontier model, launched May 19, 2026. It delivers Pro-level reasoning depth with a 1M token context window and runs 4× faster than comparable frontier models at less than half the cost — try it free on Felo AI right now.
Free to use on Felo AI — no credit card required
What Makes Gemini 3.5 Flash Different
The first Flash model to surpass its own Pro predecessor on agentic and coding benchmarks — while maintaining Flash-level speed and cost.
Built for Agentic Workflows
Gemini 3.5 Flash is Google's most capable agentic and coding model to date. It reliably executes long-horizon tasks lasting hours or weeks, handles multi-step tool use, and coordinates sub-agents via Google's Antigravity framework — making large-scale agentic systems economically viable.
Dynamic Thinking — Configurable Reasoning Depth
Thinking is enabled by default with a new thinking_level parameter (default: medium). Gemini 3.5 Flash performs internal multi-step planning before responding, delivering reasoning depth that rivals flagship Pro models on math, coding, and logic tasks — with the depth tunable per request.
1M Token Context Window
Feed in an entire codebase, hours of video, or a year's worth of financial contracts in a single request. The 1M input token window paired with 64K output tokens means complex tasks stay complete — nothing gets truncated. MRCR v2 long-context score of 26.6% leads all comparable models.
4× Faster, Less Than Half the Cost
Gemini 3.5 Flash runs 4× faster than comparable frontier models at less than half the cost. At $1.50 per million input tokens with context caching at $0.15/M, running AI agents around the clock becomes practical — not just technically possible.
The New Pareto Frontier: Speed × Intelligence
For years, faster meant less capable. Gemini 3.5 Flash breaks that tradeoff — it sits at the top-right of the speed-intelligence curve, outpacing models that cost far more.
Gemini 3.5 Flash leads the intelligence-vs-speed Pareto frontier among frontier models. Source: Artificial Analysis, May 2026.
Gemini 3.5 Flash vs Claude Opus 4.7 vs GPT-5.5
Official model card results. Gemini 3.5 Flash leads on multimodal understanding, agentic tool use, and long-context retrieval.
Source: Gemini 3.5 Flash Model Card — Google DeepMind, May 2026.
Technical Specifications
Everything you need to know before integrating Gemini 3.5 Flash into your application.
Context Window
API Pricing
General Availability
May 19, 2026 — Google I/O
Knowledge Cutoff
January 2026
Thinking Mode
On by default. Configurable via thinking_level: low / medium (default) / high. Thought Preservation retains reasoning across multi-turn conversations.
Tool Use & APIs
Function calling, structured output, code execution, Google Search grounding, context caching — all supported natively.
Input Modalities
Text, images, audio, video, PDF — native multimodal, no preprocessing required.
Native Multimodal — One Model, Every Input Type
Gemini 3.5 Flash processes text, images, audio, and video natively — no separate pipelines, no stitching together multiple models.
Text & PDF
Parses million-word documents with high accuracy. Handles complex tables, code, and structured data in a single pass.
Image Understanding
MMMU-Pro score of 83.6% — global #1. Analyzes architectural blueprints, charts, and detailed visual content in real time.
Video Analysis
Supports up to 1 hour of video input. Captures key changes frame by frame for summarization, QA, and content analysis.
Audio Processing
Recognizes emotion, ambient sound, and multilingual conversation. Powers real-time translation and voice assistants.
Available Everywhere You Build
Gemini 3.5 Flash is deeply integrated across Google's developer and consumer ecosystem — from API access to the default model powering billions of users.
Developer Platforms
- Gemini API
- Google AI Studio
- Android Studio
- Google Antigravity
- Gemini Enterprise Agent Platform (Vertex AI)
Consumer Products
- Gemini App — global default model
- Google Search AI Mode — default model
- Gemini Spark — personal AI agent
- Felo AI — free access via search & playground
Gemini 3.5 Flash leads the intelligence-vs-cost frontier. Less than half the cost of comparable models for equivalent task performance. Source: Artificial Analysis, May 2026.
Who Uses Gemini 3.5 Flash
From individual developers to enterprise teams, Gemini 3.5 Flash fits wherever you need fast, capable AI at scale.
Agentic Coding
Terminal-Bench 2.1 score of 76.2% with low latency. Coding agents complete tasks faster with fewer logic gaps — iterative code generation, debugging, and A/B testing at Flash speed.
Financial & Tax Processing
Process a full year of contracts and statements in one request. Xero uses it to handle 1099 tax forms; Ramp uses its multimodal OCR for complex invoice processing.
Enterprise Agent Platforms
Salesforce integrates it into Agentforce to accelerate enterprise agent deployment. Databricks uses it to monitor real-time data and diagnose issues autonomously.
Long-Horizon Business Tasks
Shopify uses it for merchant growth forecasting. Reliably executes complex workflows lasting hours or weeks — the kind of tasks that previously required human oversight at every step.
Multimodal Content Analysis
Analyze video, images, and documents together in a single request. CharXiv Reasoning score of 84.2% means it extracts insights from complex charts and mixed-media content accurately.
Consumer AI Products
Now the default model in the Gemini app and Google Search AI Mode — serving billions of monthly active users. Fast Mode delivers near-instant responses on mobile.
What Teams Are Saying
“Its long-context performance is exceptional for processing large-scale unstructured multimodal datasets.”
— Bridgewater Associates
“We integrated Gemini 3.5 Flash into Agentforce to accelerate enterprise agent deployment — the speed-to-capability ratio is unlike anything we've seen before.”
— Salesforce
“Gemini 3.5 Flash lets us monitor real-time information and diagnose issues autonomously in our agentic workflows.”
— Databricks
Two Ways to Use Gemini 3.5 Flash on Felo
Felo AI Search
Open Felo AI Search and select the Gemini 3.5 Flash model. Ask questions, search the web with AI, and get cited answers — powered by Google's fastest frontier model.
Open Felo AI Search
Felo LLM Playground
Open Felo LLM Playground, select Gemini 3.5 Flash, and start chatting. Compare outputs from multiple models side by side to see the speed and reasoning difference firsthand.
Open PlaygroundFrequently Asked Questions
Try Gemini 3.5 Flash Free — Right Now
Launched at Google I/O 2026. Open Felo AI and start using Google's fastest frontier model today.
Open Gemini 3.5 Flash on FeloFree to use — no credit card required