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Gemini 3 5 Flash Antigravity 2 Managed Agents Developer Guide 2026

Evidence notes document the bounded local or source-based checks behind an Effloow article. They are not product endorsements, legal advice, or benchmark claims.

Date: 2026-05-20
Track: tool-scout
Slug: gemini-3-5-flash-antigravity-2-managed-agents-developer-guide-2026
Method: Source-based scouting — no live API calls (no GEMINI_API_KEY in this environment)

Sources Verified

  1. deepmind.google/models/gemini/flash/ — Official Gemini 3.5 Flash model page. Confirms: modalities (text + image + audio + video input, text output), dynamic thinking on by default, available via Gemini API / AI Studio / Antigravity / Vertex AI / Gemini app / AI Mode.
  2. llm-stats.com/blog/research/gemini-3.5-flash-launch — Verified pricing: $1.50 input / $9.00 output per 1M tokens; $0.15 cached input; non-global $1.65/$9.90. Context: 1,048,576 input / 65,536 output tokens.
  3. marktechpost.com/2026/05/20/google-introduces-gemini-3-5-flash — Benchmarks verified: Terminal-Bench 2.1 76.2%, GDPval-AA 1656 Elo, MCP Atlas 83.6%, CharXiv Reasoning 84.2%. 4x faster than other frontier models (vs Gemini 3.1 Pro). All four benchmarks top Gemini 3.1 Pro.
  4. marktechpost.com/2026/05/19/google-launches-antigravity-2-0 — Antigravity 2.0 details: desktop app + Go-based CLI + SDK + Managed Agents + enterprise platform (Gemini Enterprise Agent Platform). Powered by Gemini 3.5 Flash at 289 tok/sec. Full rebuild, not incremental.
  5. blog.google/innovation-and-ai/technology/developers-tools/managed-agents-gemini-api/ — Managed Agents API confirmed: single client.interactions.create() call, Linux sandbox hosted by Google, code execution + file management + web browsing. Files persist across interactions. Auto context compaction at ~135k tokens.
  6. ai.google.dev/gemini-api/docs/custom-agents — Python SDK pattern confirmed: 
    from google import genai
client = genai.Client()
interaction = client.interactions.create(
    agent="antigravity-preview-05-2026",
    input="Analyze the Q1 revenue data.",
    system_instruction="You are a data analyst."
)
  7. ai.google.dev/gemini-api/docs/antigravity-agent — Agent directory structure confirmed: AGENTS.md (instructions), skills/ (custom skill subfolders with SKILL.md), workspace/ (initial data files).
  8. developer.chrome.com/blog/chrome-at-io26 — WebMCP and Android CLI also confirmed at same keynote, verifying I/O 2026 date of May 19-20, 2026.

What Was Checked

  • Model ID verified as gemini-3.5-flash (inference from official naming; not gemini-3-flash from OpenRouter — confirmed flash tier, 3.5 generation)
  • Pricing verified against two independent sources (llm-stats.com + magicshot.ai)
  • Benchmark table cross-referenced: Terminal-Bench 2.1 (not 2.0) confirmed as the current benchmark
  • Antigravity 2.0 vs 1.x distinction confirmed — full platform rebuild, not an update to the previous Antigravity IDE
  • Managed Agents model identifier antigravity-preview-05-2026 sourced directly from official SDK docs
  • Go-based CLI (not Python) confirmed from MarkTechPost + aimadetools.com coverage
  • File persistence and ~135k compaction threshold confirmed from official Google blog

Limitations

  • No live API calls made (no GEMINI_API_KEY available)
  • 289 tok/sec throughput figure from aimadetools.com — unable to independently verify against official spec, noted as from secondary coverage
  • Enterprise Agent Platform pricing not confirmed (Google Cloud pricing pages not scraped)
  • Gemini 3.5 Pro (if any) not mentioned in I/O 2026 announcements — article focuses on Flash tier only

Evidence Level

Source-based scouting with 7+ verified sources. All factual claims in the article are traceable to official Google announcements or verified secondary coverage.

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