Gemini 3.1 Pro and Grok 4 were two of the most capable non-OpenAI, non-Anthropic models in early 2026. Gemini 3.1 Pro has the much larger window (1M tokens against Grok 4's 256K), scored 77.1% on ARC-AGI-2 at launch, is cheaper ($2 vs $3/1M input) and integrates with Google Workspace. Grok 4's edge was real-time X data. xAI retired Grok 4 from its API on May 15, 2026.
GooglePremium
Gemini 3.1 Pro
Google's Pro model — 1M context and native multimodal input at $2/$12.
Winner
VS
xAIBalanced
Grok 4
Retired May 15, 2026 — replaced by Grok 4.6 and Grok 4.7.
At a glance
Gemini 3.1 Pro
Grok 4
Input cost / 1M tokens
$$2.00/1M
$$3.00/1M
Output cost / 1M tokens
$$12.00/1M
$$15.00/1M
Context window
1M tokens
256k tokens
Speed
Balanced
Fast
Price tier
Premium
Balanced
Benchmarks
SWE-bench (coding)
80.6%
54%
Arena Elo
1,380
1,305
MMLU
90%
87.5%
How they compare
Which model wins for each use case — and why.
ResearchGemini 3.1 Pro wins
Gemini 3.1 Pro leads reasoning benchmarks including ARC-AGI-2 at 77.1% and integrates natively with Google Search for deep research tasks.
Real-time DataGrok 4 wins
Grok 4 has exclusive access to real-time X/Twitter data — no other model can match this for social media analysis, trending topics, and current events.
Context WindowGemini 3.1 Pro wins
Gemini 3.1 Pro has about four times the window: 1M tokens against Grok 4's 256K. Earlier versions of this page said both had 2M; that was wrong.
CodingGemini 3.1 Pro wins
Gemini 3.1 Pro edges Grok 4 on coding benchmarks and has better integration with Google's developer tools and Vertex AI.
PriceGemini 3.1 Pro wins
Gemini 3.1 Pro is cheaper on both sides: $2/$12 per 1M tokens against Grok 4's $3/$15.
Which should you pick?
Pick Gemini 3.1 Pro if…
You use Google Workspace, Docs, or Gmail and want native AI integration
Research quality and benchmark performance are your priority
You're already on Google Cloud or Vertex AI
You want the strongest model for document analysis and synthesis
For most workflows, Gemini 3.1 Pro is the stronger choice.
A capable research model and still Google's current Pro tier, but no longer the long-context leader: its 1M-token window matches Claude Opus 5.5 and is slightly below the GPT-6 family's 1.05M. Choose it for Google Workspace integration and multimodal input; for most research, Claude Opus 5.5 or GPT-6.1 Sol are stronger at a similar price.
The case for each model
What each one is genuinely good at, where it falls down, and when we would steer you away from it.
Our overall pick in this comparison. Against Grok 4 it costs about 22% less per token and takes 4x the context.
Google's Pro-tier Gemini 3 model, released in preview on February 19, 2026, with a 1M-token context window, Deep Think reasoning and $2/$12 pricing.
Input
$2.00/1M
Output
$12.00/1M
Context
1M tokens
Speed
Balanced
What people actually use it for
Analyzing long contracts, codebases, or research papers in a single 1M-token prompt
Due diligence synthesis across large sets of financial documents or legal agreements
Multi-step reasoning across dense technical specifications with Deep Think mode
Where it wins
1M-token context window with native image, audio, video and PDF input
Scored 77.1% on ARC-AGI-2 at its February 2026 launch
$2/$12 per 1M tokens — cheaper output than most premium models
Where it falls down
Slower than Flash for everyday lightweight tasks
Claude Sonnet 5.5 is better for writing quality, at a lower $2/$10
Skip it if
Your primary use case is writing quality or agentic coding — Claude wins both.
Our verdict
A capable research model and still Google's current Pro tier, but no longer the long-context leader: its 1M-token window matches Claude Opus 5.5 and is slightly below the GPT-6 family's 1.05M. Choose it for Google Workspace integration and multimodal input; for most research, Claude Opus 5.5 or GPT-6.1 Sol are stronger at a similar price.
The runner-up here, but not by a wide margin. Against Gemini 3.1 Pro it costs about 22% more per token and answers faster.
xAI's July 2025 flagship, priced at $3/$15 per million tokens with a 256K context window. Retired from xAI's API on May 15, 2026; current Grok models are Grok 4.6 and Grok 4.7.
Input
$3.00/1M
Output
$15.00/1M
Context
256k tokens
Speed
Fast
What people actually use it for
Early-stage research mapping — exploring a new topic before narrowing down
Analyzing codebases and datasets within a 256K-token context window
Competitive intelligence and market research with broad, fast synthesis
Where it wins
Strong coding and reasoning at its July 2025 launch
256K-token context window
Fast and responsive for exploration and open-ended research loops
Where it falls down
Retired from xAI's API on May 15, 2026
Less established ecosystem and tooling than OpenAI or Anthropic
Skip it if
You need the highest writing quality or the most reliable production-grade output — Claude wins both.
Our verdict
Retired: xAI shut down the grok-4-0709 API on May 15, 2026. It was a strong coding model at launch, at $3/$15 with a 256K window; earlier versions of this page listed $2/$6 and 2M tokens in error. Use Grok 4.7 instead.
Full pricing, benchmark table and release notes on the Grok 4 page.
Frequently asked questions
Is Gemini or Grok better in 2026?
Gemini 3.1 Pro leads on research benchmarks and Google ecosystem integration. Grok 4 is the only model with real-time X/Twitter data. For most users, Gemini is the stronger general-purpose choice.
Do Gemini and Grok have the same context window?
No — Gemini 3.1 Pro's 1M-token window is about four times Grok 4's 256K, so Gemini is the better choice for large document analysis.
Which is cheaper — Gemini or Grok?
Gemini 3.1 Pro is cheaper: $2/$12 per 1M tokens against Grok 4's $3/$15. Earlier versions of this page listed Grok 4 at $2/$6; that was wrong.
Can Gemini access real-time data?
Gemini can integrate with Google Search for current information. Grok has exclusive real-time access to X/Twitter data. Both have real-time capabilities but from different sources.
Which is better for Google Workspace users?
Gemini 3.1 Pro is built for Google Workspace integration — it works natively in Gmail, Docs, Sheets, and Meet. Grok has no Google integration.