Just moments ago at Google I/O 2026, Google announced Gemini 3.5 Flash, a brand new lightweight AI model built to run complex multi-step workflows at very high speeds. The company claims it's "strongest agentic and coding model yet."
According to the Mountain View-based tech giant, Gemini 3.5 Flash scored 76.2% on the Terminal-bench 2.1 coding evaluation and 1656 on the GDPval-AA real-world agentic benchmark. This performance beats Gemini 3.1 Pro that launched on February 19, 2026. Google specifically designed the model built for long-horizon tasks, agentic coding, and coordinating subagents to give enterprise API customers a highly reduced cost-per-token for heavy workloads.
Meet Gemini 3.5 Flash — our strongest agentic and coding model yet.
— Google (@Google) May 19, 2026
It delivers frontier-level performance at 4x the speed of comparable frontier models — often at less than half the cost.
Generally available, starting today. 🧵#GoogleIO pic.twitter.com/jLhqozutwG
Here's how Gemini 3.5 Flash compares with Gemini 3.1 Pro (and other models from competitors):
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash | Gemini 3.1 Pro | Claude Sonnet 4.6 | Claude Opus 4.7 | GPT-5.5 |
|---|---|---|---|---|---|---|
| Terminal-bench 2.1 | 76.2% | 58.0% | 70.3% | - | 66.1% | 78.2% |
| SWE-Bench Pro (Public) | 55.1% | 49.6% | 54.2% | - | 64.3% | 58.6% |
| MCP Atlas | 83.6% | 62.0% | 78.2% | 69.5% | 79.1% | 75.3% |
| Toolathlon | 56.5% | 49.4% | - | - | - | 55.6% |
| OSWorld-Verified | 78.4% | 65.1% | 76.2% | 72.5% | 78.0% | 78.7% |
| Finance Agent v2 | 57.9% | 42.6% | 43.0% | 51.0% | 51.5% | 51.8% |
| GDPval-AA | 1656 | 1204 | 1314 | 1676 | 1753 | 1769 |
| CharXiv Reasoning | 84.2% | 80.3% | 83.3% | 72.4% | 82.1% | 84.1% |
| MMMU-Pro | 83.6% | 81.2% | 80.5% | 74.5% | 75.2% | 81.2% |
| Blueprint-Bench 2 | 33.6% | 0.0% | 26.5% | 6.7% | 24.5% | 36.2% |
| MRCR v2 (128k) | 77.3% | 67.2% | 84.9% | 84.9% | 59.3% | 94.8% |
| MRCR v2 (1M) | 26.6% | 22.1% | 26.3% | - | - | - |
| Humanity's Last Exam | 40.2% | 33.7% | 44.4% | 33.2% | 46.9% | 41.4% |
| ARC-AGI-2 | 72.1% | 33.6% | 77.1% | 58.3% | 75.8% | 84.6% |
Google said that Gemini 3.5 Flash is now available globally to everyone in the Gemini app and in AI Mode in Google Search, to developers in Google Antigravity and the Gemini API in Google AI Studio and Android Studio, and to enterprises in the Gemini Enterprise Agent Platform.
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