Which AI model is best in April 2026?

It depends on use case. Claude Opus 4.6 leads in coding and agentic tasks. GPT-5.4 Thinking excels at complex reasoning. Gemini 3.1 Pro has the best multimodal capabilities and largest context window at 2M tokens.

How much do GPT-5.4, Claude Opus 4.6, and Gemini 3.1 Pro cost?

ChatGPT Plus is $20/month, Claude Pro is $20/month, and Google AI Pro is $19.99/month. API pricing varies: GPT-5.4 is $15/$60 per million tokens, Claude Opus 4.6 is $15/$75, and Gemini 3.1 Pro is $7/$21.

Which is cheapest for API use?

Gemini 3.1 Pro is the most affordable at $7 input / $21 output per million tokens. GPT-5.4 Mini and Claude Sonnet 4.6 offer cheaper options if you don't need frontier-level performance.

Quick Answer

GPT-5.4 vs Claude Opus 4.6 vs Gemini 3.1 Pro (Apr)

Published: April 2, 2026

GPT-5.4 vs Claude Opus 4.6 vs Gemini 3.1 Pro (April 2026)

Three frontier models dominate April 2026. Here’s how they compare across pricing, capabilities, and real-world performance.

Last verified: April 2026

Quick Comparison

Feature	GPT-5.4	Claude Opus 4.6	Gemini 3.1 Pro
Released	Mar 2026	Feb 2026	Feb 2026
By	OpenAI	Anthropic	Google
Context	256K tokens	200K tokens	2M tokens
Subscription	$20/mo (Plus)	$20/mo (Pro)	$19.99/mo (AI Pro)
API Input	$15/M tokens	$15/M tokens	$7/M tokens
API Output	$60/M tokens	$75/M tokens	$21/M tokens
Best for	Reasoning, general	Coding, agents	Multimodal, long context

Coding Performance

Claude Opus 4.6 is the consensus coding leader:

SWE-bench Verified: Opus 4.6 leads at 72.7%, followed by GPT-5.4 at 69.1%
Agentic coding: Claude Code + Opus 4.6 is the most popular autonomous coding setup
Agent teams: Anthropic’s new agent team feature lets multiple Claude instances collaborate
PowerPoint integration: Opus 4.6 added native presentation creation

GPT-5.4 competes closely with its Thinking mode variants (Standard, Pro) that show chain-of-thought reasoning. Gemini 3.1 Pro is solid but not the first choice for pure coding tasks.

Reasoning

GPT-5.4 Thinking is the reasoning specialist:

Three tiers: Standard, Thinking, and Pro
Pro mode uses extended compute for hard math/science problems
GPQA Diamond scores are highest among all models
But it’s slow — Pro mode can take 60+ seconds per response

Claude Opus 4.6 handles reasoning well for practical tasks. Gemini 3.1 Pro has its own Deep Think mode for extended reasoning.

Multimodal

Gemini 3.1 Pro wins handily:

Native multimodal — processes images, video, audio, and code together
2M token context — can analyze entire codebases or hour-long videos
Google AI Studio integration — great for prototyping multimodal apps

GPT-5.4 handles images and audio well. Claude Opus 4.6 supports images and PDFs but no video or audio natively.

Unique Features

GPT-5.4

Thinking mode with visible reasoning chains
Deep research tool built-in
Image generation (DALL-E) integrated
Codex agent for autonomous coding

Claude Opus 4.6

Agent teams (multiple instances collaborating)
Claude Code for terminal-based coding
Cowork for desktop automation
PowerPoint creation
Best safety/alignment of the three

Gemini 3.1 Pro

2M token context window
Native video/audio understanding
Deep Think extended reasoning mode
Google AI Studio for vibe coding
Cheapest API pricing

Who Should Use What

Use Case	Best Pick
Coding/agents	Claude Opus 4.6
Complex reasoning	GPT-5.4 Thinking
Long documents	Gemini 3.1 Pro (2M context)
Multimodal	Gemini 3.1 Pro
Budget API	Gemini 3.1 Pro ($7/M input)
Desktop automation	Claude Opus 4.6 (Cowork)
Writing	GPT-5.4 or Claude Opus 4.6

Bottom Line

There’s no single “best” model anymore. Claude Opus 4.6 dominates coding and agentic workflows. GPT-5.4 Thinking has the edge in pure reasoning. Gemini 3.1 Pro offers the best value and multimodal capabilities. Pick based on your primary use case — or use all three.

Last verified: April 2026