Google

Gemini 3.1 Pro

Top Pick

9.0

out of 10

Google's reasoning-optimized flagship, released February 19, 2026, and currently the #1 ranked model on the Artificial Analysis Intelligence Index (score: 57 out of 114 models). Gemini 3.1 Pro is a direct upgrade to Gemini 3 Pro — same 1M token context window and same $2/$12 pricing — but with dramatically improved reasoning. Its ARC-AGI-2 abstract reasoning score more than doubled from 31.1% to 77.1%, and it nearly doubled its APEX-Agents agentic task score (18.4% → 33.5%). It leads on scientific knowledge (GPQA Diamond 94.3%), competitive coding (LiveCodeBench Pro Elo 2887), and multi-step agentic search (BrowseComp 85.9%). A dedicated custom-tools API endpoint is available for agentic pipeline use. Currently in preview — generally available soon.

Context window

1.0M tokens

API (blended)

$4.50/1M

Consumer access

Free (limited) / $20/mo

Multimodal

Yes

Try Gemini 3.1 Pro Compare

Strengths

+#1 Artificial Analysis Intelligence Index score (57) as of February 2026 — leads 114 models
+ARC-AGI-2: 77.1% — more than doubled Gemini 3 Pro (31.1%); leads all known published models
+APEX-Agents: 33.5% — best long-horizon agentic task performance; nearly doubled predecessor
+GPQA Diamond: 94.3% scientific knowledge — highest published score across all models
+Same $2/$12 pricing as Gemini 3 Pro — major capability upgrade at no extra cost
+Dedicated custom-tools API endpoint (gemini-3.1-pro-preview-customtools) for agentic workflows

Weaknesses

-Preview only as of February 2026 — not yet generally available
-Time to first token: 29.96s — high latency makes it unsuitable for interactive or streaming use
-GDPval-AA Elo only 1317 — trails Claude Sonnet 4.6 (1633) by 316 points on enterprise expert tasks
-Very verbose — generates far more tokens per task (cost impact at scale)
-Prompts over 200K tokens billed at 2× — full 1M context at scale gets expensive quickly

Best for

reasoningagentic codingscientific researchlong documentsmultimodal analysisagentic pipelinescompetitive programming

Not ideal for

enterprise expert tasks (Claude leads GDPval-AA by 316 points)real-time interactive use (29.96s time to first token)cost-sensitive very-long-context workloads (2× billing over 200K tokens)

Pricing details

Subscription plans

Google AI Studio (Developer Free Tier)Rate-limited API access for development and testing — not a consumer product(60 req/min; for development and evaluation only)

Free

Google One AI PremiumGemini 3.1 Pro access via Gemini App, 2TB Google Drive, Gemini in Gmail/Docs/Sheets

$20/mo

API pricing

Google AI Studiofree tier≤200K context: $2/$12 per 1M tokens. >200K tokens: $4/$18 per 1M. Free tier: rate-limited (60 req/min). Batch API, context caching, function calling, and search grounding supported. Custom-tools endpoint: gemini-3.1-pro-preview-customtools.

$2/$12

Google Vertex AIEnterprise tier with SLAs. Same base pricing as AI Studio. Committed use discounts available. Preferred for production workloads.

$2/$12

Prices verified February 2026. LLM pricing changes frequently — verify at the provider's site before budgeting.

Last updated: February 2026

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