ChatGPT vs Claude vs Grok: OpenAI, Anthropic, and xAI Compared

The Honest Answer: Three Lanes

On general benchmarks the three are close. The separation is by specialty. GPT-5.5 owns math and hard reasoning (the first model to score 100% on AIME 2025) and has the deepest ecosystem. Claude Opus 4.7 owns coding (64.3% SWE-bench Pro, 87.6% Verified) and long-form writing, and ships Claude Code. Grok 4.3 owns real-time information from X, applies fewer guardrails, and is the cheapest on the API.

Pricing

Grok's API is dramatically cheaper, which makes it attractive for high-volume work. Claude Pro bundles Claude Code at $20. ChatGPT and Claude match at the consumer tier; Grok costs more as a subscription but far less to build on.

Where Each Wins

Pick by Task

Why Using All Three Beats Choosing One

If each wins a different lane, a single pick loses every lane it does not own. Route instead: GPT-5.5 for hard reasoning, Claude for code and writing, Grok's cheap API for high-volume and real-time, and a cheap model for the easy majority. You get each strength without managing selection logic, and you cut API costs 40-70%.

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.MORPH_API_KEY,
  baseURL: "https://api.morphllm.com/v1",
});

const response = await client.chat.completions.create({
  model: "router-default",  // routes across OpenAI, Anthropic, xAI
  messages: [{ role: "user", content: userQuery }],
});

// Hard math      -> GPT-5.5
// Coding         -> Claude Opus 4.7
// Real-time/bulk -> Grok 4.3 (cheap)
// Easy request   -> cheap mini model

Frequently Asked Questions

Which is best: ChatGPT, Claude, or Grok?

Each leads a lane: GPT-5.5 for math and ecosystem, Claude for coding and writing, Grok for real-time and cheap API. Pick by task or route across all three.

Which is cheapest?

Grok on the API ($1.25/$2.50 per M). At the consumer tier ChatGPT and Claude ($20) beat SuperGrok ($30).

Which is best for coding?

Claude Opus 4.7, leading SWE-bench Pro and shipping Claude Code. GPT-5.5 is close with Codex.

Can I use all three together?

Yes, via a model router that routes across OpenAI, Anthropic, and xAI automatically.