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How smart is Gemini 3.5 Flash?

126 SI-IQ · 90% interval 123–129
Rank 26 of 80 ranked models · Plausible rank range 13–41

Gemini 3.5 Flash is a model from Google DeepMind, released on May 19, 2026. Its SI-IQ is 126 (90% interval 123–129), estimated from 10 benchmark results by 2 evaluators.

Data as of Oct 18, 2026 · method 1.0.0

Facts

Developer: Google DeepMind
Released: May 19, 2026
Access: API access
Benchmarks used: 10 benchmark results from 2 evaluators
API price: $1.50 input / $9.00 output per 1M tokens (developer's price list, Oct 18, 2026)
Context window: 1,048,576 tokens

Ability by area (SI-IQ, 90% interval)

Every benchmark result we used

Each score is one value exactly as the source published it: for Epoch AI the best of its run settings, for OpenRouter the median hosting provider (the developer's own hosting when it ran the test). “Implied SI-IQ” is the ability that this single result points to; the overall SI-IQ is their precision-weighted average.

Benchmark	Area	Score	Implied SI-IQ	Evaluated by	As listed by the source	Retrieved	Source
Chess Puzzles	Reasoning	45.0%	131	Epoch AI	`gemini-3.5-flash_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
Mystery Game Puzzles	Reasoning	32.0%	125	Epoch AI	`gemini-3.5-flash_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
FrontierMath Tier 4	Math	26.8%	124	Epoch AI	`gemini-3.5-flash_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
FrontierMath Tiers 1–3	Math	62.8%	125	Epoch AI	`gemini-3.5-flash_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
OTIS Mock AIME 2024–2025	Math	95.6%	124	Epoch AI	`gemini-3.5-flash_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
SWE-bench Verified (Epoch AI run)	Coding	79.3%	129	Epoch AI	`gemini-3.5-flash_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
GPQA Diamond	Knowledge	92.8%	131	Epoch AI	`gemini-3.5-flash_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
GPQA Diamond (OpenRouter run)	Knowledge	92.4%	137	OpenRouter	`google/gemini-3.5-flash-20260519` Google · first-party provider (2 of 2 rows), lower median	Oct 18, 2026	OpenRouter benchmark datasets · data file
SimpleQA Verified	Knowledge	66.2%	145	Epoch AI	`gemini-3.5-flash_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
τ²-bench Airline (OpenRouter run)	Agents	73.3%	126	OpenRouter	`google/gemini-3.5-flash-20260519` Google AI Studio · first-party provider (2 of 2 rows), lower median	Oct 18, 2026	OpenRouter benchmark datasets · data file

Models with similar SI-IQ

Model	SI-IQ
Grok 4.6xAI	126	Gemini 3.5 Flash vs Grok 4.6
Claude Sonnet 5Anthropic	126	Gemini 3.5 Flash vs Claude Sonnet 5
Gemini 3.1 ProGoogle DeepMind	127	Gemini 3.5 Flash vs Gemini 3.1 Pro
Claude Opus 4.7Anthropic	127	Gemini 3.5 Flash vs Claude Opus 4.7
Kimi K3Moonshot	127	Gemini 3.5 Flash vs Kimi K3

Computed with SI-IQ method version 1.0.0. Read the full methodology

Data sources: Epoch AI, ‘Capabilities & benchmarking’ (CC BY 4.0); LiteLLM, model_prices_and_context_window.json (MIT); Source: OpenRouter (openrouter.ai), licensed under CC BY 4.0: reuse and republish with attribution to OpenRouter (licences and changes).