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Gemini 3 5 Flash Api 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: 2026-05-27 Track: tool-scout Slug: gemini-3-5-flash-api-developer-guide-2026
What was verified
Source-based scouting. No live API calls (no GEMINI_API_KEY in this environment).
Key facts verified from official sources
| Fact | Source | Verified |
|---|---|---|
Model ID gemini-3.5-flash |
ai.google.dev/gemini-api/docs/models/gemini-3.5-flash | ✓ |
| GA at Google I/O May 19 2026 | marktechpost.com, magicshot.ai | ✓ |
| $1.50 input / $9.00 output per 1M tokens | pricepertoken.com, tokenmix.ai | ✓ |
| $0.15 cached input / $9.00 output | pricepertoken.com | ✓ |
| 1,048,576 input context window | ai.google.dev official docs | ✓ |
| 65,536 output token limit | ai.google.dev official docs | ✓ |
| 76.2% Terminal-Bench 2.1 | marktechpost.com, llm-stats.com | ✓ |
| 83.6% MCP Atlas benchmark | buildfastwithai.com | ✓ |
| 84.2% CharXiv Reasoning | marktechpost.com | ✓ |
| 4x faster output than comparable frontiers | chatforest.com | ✓ |
| Supports text + image + audio + video input, text output | official docs | ✓ |
| Available on: Gemini API, AI Studio, Vertex AI, Antigravity, GEAP | official docs | ✓ |
| Outperforms Gemini 3.1 Pro on coding and agentic benchmarks | marktechpost.com | ✓ |
| Requires google-genai SDK v2.0.0+ | official docs | ✓ |
API code patterns confirmed
- Interactions API (recommended for stateful agentic use):
client.interactions.create({ model: "gemini-3.5-flash", ... }) - GenerateContent API:
client.models.generate_content(model="gemini-3.5-flash", ...) thinking_levelparameter (replacesthinking_budgetfrom prior versions) confirmed from official docs
Breaking changes for existing Gemini 3.1 Pro users
- SDK:
google-genaiv2.0.0+ required (breaking changes to Interactions API) - Parameter:
thinking_budget→thinking_level - Function call responses:
id,name, andresponsemust all match in responses
What was NOT verified
- Live API calls (no key available)
- Actual tokens/second measurement
- Antigravity 2.0's 12x internal optimization (unverified secondary claim)
Sources
- https://ai.google.dev/gemini-api/docs/models/gemini-3.5-flash
- https://www.marktechpost.com/2026/05/20/google-introduces-gemini-3-5-flash-at-i-o-2026-a-faster-and-cheaper-model-for-ai-agents-and-coding/
- https://pricepertoken.com/pricing-page/model/google-gemini-3.5-flash
- https://llm-stats.com/blog/research/gemini-3.5-flash-launch
- https://www.nxcode.io/resources/news/gemini-3-5-flash-complete-guide-benchmarks-pricing-api-2026
- https://tokenmix.ai/blog/gemini-3-5-pro-release-date-google-io-2026
- https://chatforest.com/reviews/gemini-3-5-flash-google-io-2026-review/
- https://www.buildfastwithai.com/blogs/gemini-3-5-flash-review-benchmarks-price-api
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This note supports the public article and records what was actually checked.