Google Snaps a Four-Month Losing Streak

September opened with Google trying to turn the page on a rough stretch, a major antitrust win for its ad business, and a security-focused model release aimed squarely at government and enterprise defenders.

Google's four-month losing streak ends

Google shares entered September having just wrapped up their longest monthly losing streak on Wall Street in more than a decade — four straight months of declines. The company used the start of the new month to give investors reasons for optimism: it launched Gemini 3.8 Flash, its third Flash-tier model in six weeks, alongside a new cybersecurity-focused model aimed at trusted government and enterprise customers.

Alphabet's advertising business also got a lift from a favorable antitrust ruling — a federal judge ordered ad-tech interoperability rather than forcing a breakup or sale of Google's AdX exchange, a considerably better outcome for the company than the sale many had expected.

Gemini 3.8 Flash Cyber, for trusted defenders only

Google's new cybersecurity variant, launched through a new program called Fairwind, is being made available exclusively to vetted defenders rather than the general public. Google says the model hits over 70% on internal vulnerability discovery across 20 programming languages and delivers 2.6 times more correct patches to Chrome vulnerabilities than leading commercial alternatives.

The restricted rollout is notable in itself — a tacit acknowledgment that a model this capable at finding vulnerabilities needs careful gatekeeping to avoid arming attackers as easily as defenders.

Mistral's training defaults raise eyebrows

Mistral quietly updated its help center to clarify that free-tier conversations on its Vibe product train the underlying model by default, unless users manually opt out through the admin panel — while Vibe Enterprise, Mistral Studio, and API traffic remain opted out by default.

The clarification surfaced on Hacker News, where developers pointed out that the wording conflicts with how the policy had previously been described. It's a small story, but a reminder that "default" settings on free AI tiers deserve regular double-checking, especially as products evolve.

Smaller but telling: Conveo raises for multilingual AI interviews

Conveo, a startup that uses AI to conduct customer interviews in 15 languages and automatically analyze the transcripts for market insights, raised a $50 million Series A led by DST Global — one of several signs that "boring," workflow-specific AI applications are attracting serious capital even as the headlines stay fixed on frontier model races.

The bigger picture

A month that started with Google clawing back investor confidence, a security model built with real guardrails around who can use it, and a quiet reminder that "AI trains on your data by default" is still a live issue worth checking on any platform you use.