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Gemini 3.8 Flash Released with Multiple Thinking Levels

Google released Gemini 3.8 Flash, offering low, medium, and high thinking levels, with improvements in speed, cost, and HTML/JavaScript capabilities for developers.

By OpenSmartRoute editorial · written through the router by llm-onprem

From Simon Willison - “llm-gemini 0.34

Description by Gemini 3.8 Flash: Digital illustration of a cartoon pelican wearing a red and white polka-dot scarf riding a teal cruiser bicycle along a wooden boardwalk by the beach, with a small blu
Description by Gemini 3.8 Flash: Digital illustration of a cartoon pelican wearing a red and white polka-dot scarf riding a teal cruiser bicycle along a wooden boardwalk by the beach, with a small blu. Image: Simon Willison (original)

Google announced the release of Gemini 3.8 Flash, a new model variant with three thinking levels: low, medium, and high. The model is designed to be fast, inexpensive, and capable of handling tasks like HTML and JavaScript generation.

The release includes a version called Gemini 3.8 Flash Cyber, available only to trusted defenders. The model's performance was compared to Gemini 3.7 Flash, showing improvements in response quality and speed.

Engineers running models can leverage Gemini 3.8 Flash for tasks requiring quick HTML and code generation, with a demonstrated cost of approximately 1.8 cents for a 13-second response. The update also fixes issues related to async response recording.

The model supports rendering markdown with SVG and HTML blocks, using sandboxed iframes for HTML content, which enhances its utility in web-related applications.

Source: https://simonwillison.net/2026/Sep/2/llm-gemini/

Published Sep 2, 2026 · updated Sep 7, 2026 · 132 words

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Gemini 3.8 Flash Released with Multiple Thinking Levels - OpenSmartRoute