Best Foundation Models for Google Antigravity - Page 2

Gemini 3.8 Flash Cyber represents Google's most advanced cybersecurity model, offering top-tier performance in identifying vulnerabilities and automating patching processes with remarkable speed for rapid iteration. Tailored for trusted defenders, it is accessible via the Fairwind Program. On CyberGym, a recognized industry benchmark for detecting vulnerabilities, this model showcases exceptional autonomous vulnerability discovery, outperforming both Gemini 3.5 Flash Cyber and larger frontier models. Furthermore, Google assessed its effectiveness on an internal benchmark that spans complex codebases across 20 programming languages, achieving a success rate of over 70% in identifying various vulnerabilities. Unlike many models that focus on offensive strategies, Gemini 3.8 Flash Cyber emphasizes the importance of fixing vulnerabilities, providing defenders with advanced tools that enhance their ability to stay ahead of cyber attackers. This focus on proactive defense represents a crucial shift in the cybersecurity landscape, prioritizing the safeguarding of systems over mere exploitation capabilities.

Claude Fable 5.5 is an anticipated but currently unannounced model in Anthropic's Claude family, and Anthropic has not confirmed that a model with this name will be released. As of September 30, 2026, Claude Fable 5.1 remains the latest officially documented Fable model. Fable represents Anthropic's highest-end model tier for demanding reasoning and long-horizon agentic work, while the newer Opus 5.5 and Sonnet 5.5 occupy lower-cost positions in the Claude lineup. Anthropic's current documentation gives Fable 5.1 a 1-million-token context window and maximum output length of 128,000 tokens. It supports text and image inputs with text output and uses adaptive thinking that remains active throughout model operation. Fable 5.1 defaults to high reasoning effort and is listed as having a June 2026 reliable knowledge cutoff and training-data cutoff. API pricing is $10 per million input tokens and $50 per million output tokens, while prompt-cache reads cost $0.25 per million tokens and Batch API processing receives a 50% input and output discount. Anthropic's official documentation currently provides model identifiers for Fable 5.1 across the Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry, and Claude Platform on AWS. No equivalent model identifier, specifications, benchmark results, pricing, availability information, or release schedule has been published for Claude Fable 5.5.

Gemini 4 Carbon is an experimental AI model reportedly being developed by Google DeepMind for advanced reasoning and software engineering applications. The model has appeared in reports describing internal testing of multiple Gemini 4 variants, including Argon, Barium, and Carbon. Carbon has reportedly been integrated into Google's internal Jetski coding environment for evaluation by company employees. Early internal feedback has highlighted its potential performance in complex coding tasks, although independently verified benchmark results have not been published. Its reported development suggests an emphasis on improving AI-assisted programming and technical problem-solving capabilities. Potential use cases include code generation, debugging, codebase analysis, software maintenance, and autonomous development workflows. Carbon belongs to the broader Gemini 4 research effort, which includes publicly released models supporting multimodal reasoning, software engineering, and AI agent applications. However, Google has not confirmed whether Carbon will become a standalone product, an update to Gemini 4 Argon, or a different publicly branded model. Technical specifications, API availability, pricing, deployment options, and release timing remain unannounced.