Which is the best AI model in March 2026?

GPT-5.4 for reliability and coding ($2.50/M input). Gemini 3.1 Pro for multimodal tasks and long context ($2/M input). Grok 4.20 for real-time X/Twitter data ($3/M input). There's no single 'best' — it depends on your use case.

How much does GPT-5.4 cost compared to Gemini 3.1 Pro?

GPT-5.4: $2.50/$10 per million tokens. Gemini 3.1 Pro: $2/$12 per million tokens. Grok 4.20: $3/$15 per million tokens. Gemini offers the best input price; GPT-5.4 offers the best output price.

Quick Answer

GPT-5.4 vs Gemini 3.1 Pro vs Grok 4.20: March 2026 Models Compared

Published: March 31, 2026

GPT-5.4 vs Gemini 3.1 Pro vs Grok 4.20 (March 2026)

March 2026 saw three major frontier model releases. Here’s how they compare.

Quick Comparison

Feature	GPT-5.4	Gemini 3.1 Pro	Grok 4.20
Released	Mar 5, 2026	Mar 3, 2026	Mar 10, 2026
Context	1M tokens	2M tokens	512K tokens
Input price	$2.50/M	$2/M	$3/M
Output price	$10/M	$12/M	$15/M
Strength	Reliability, coding	Multimodal, long context	Real-time data
Variants	Standard, Thinking, Mini	Pro, Flash	Standard, Reasoning

When to Use Each

GPT-5.4: Best for coding, API integration, and tasks needing consistent reliability. Three variants let you trade cost vs capability.
Gemini 3.1 Pro: Best for multimodal work (images, video, audio), very long documents, and Google ecosystem integration.
Grok 4.20: Best for real-time information, X/Twitter analysis, and less-filtered responses.

The Honest Take

All three are frontier-capable. The real differentiator is ecosystem: GPT-5.4 has the largest developer ecosystem, Gemini integrates with Google Workspace, and Grok has unique real-time social data access.