GPT-5.5 wins on coding (96 vs 92) and writing quality. Grok 4 wins on price ($2 vs $5/1M input) and context window (2M vs 1M). For most workflows, GPT-5.5 is the stronger default — best openai flagship for agentic coding, research, and computer-use work.
The safest GPT-5.5 vs Grok 4 default, the cheaper option worth trying first, and the specialist pick — before you read the detail below.
GPT-5.5 is the strongest answer here for GPT-5.5 vs Grok 4 — pick it when quality of output matters more than the $5.00/1M/1M input you pay for it.
Grok 4 handles the same job for about 77% less per token. Start here and only move up if the output is not good enough.
Grok 4 is the fastest of these for GPT-5.5 vs Grok 4 — worth it when latency is what the reader notices, not the last few points of reasoning depth.
GPT-5.5 leads on coding with a score of 96 vs 92 for Grok 4.
Grok 4 has the larger context window: 2M vs 1M for GPT-5.5.
Grok 4 is cheaper at $2/1M input tokens vs $5/1M for GPT-5.5.
GPT-5.5 is the safer default: it is built for agentic coding, computer-use workflows, and complex research tasks, which covers most of what people bring to this comparison.
Switch to Grok 4 when your work is mostly coding and research at competitive pricing with maximum context; on that narrower brief it is the better tool.
Grok 4 is the more cost-efficient option at $2/1M input — GPT-5.5 costs 3x more per input token, so the gap is worth taking seriously wherever token volume rather than peak quality drives the bill.
Switch the scoring lens to see whether the GPT-5.5 vs Grok 4 answer changes when cost, speed, or long-document depth leads the decision.
OpenAI / Premium / Sep 3, 2026
Best OpenAI flagship for agentic coding, research, and computer-use work.
Ranks models by the broadest mix of coding, writing, research, and long-context usefulness.
You only care about the highest public coding benchmark score or need a cheaper high-volume model.
Where the GPT-5.5 vs Grok 4 recommendation shifts once you weigh price or latency differently.
Best OpenAI flagship for agentic coding, research, and computer-use work.
Strong coding value with 2M context — an underrated pick at this price.
List prices and published scores — the numbers this page's pick is built from.
| Model | Input | Output | Est. month | Context | Speed | Coding | Writing | Research |
|---|---|---|---|---|---|---|---|---|
| GPT-5.5OpenAI | $5.00/1M | $30.00/1M | $110 | 1M tokens | Balanced | 96 | 92 | 94 |
| Grok 4xAI | $2.00/1M | $6.00/1M | $32 | 2M tokens | Fast | 92 | 70 | 86 |
Scores out of 100 — how we evaluate models. “Est. month” is 10M in / 2M out at list price: a ceiling, no discounts.
Why each one is on the shortlist for GPT-5.5 vs Grok 4, what it is genuinely good at, and where we would steer you away from it.
Ranked first here for GPT-5.5 vs Grok 4: 96/100 on coding, with the widest margin of anything in this line-up.
OpenAI's latest agentic flagship for coding, research, computer-use workflows, and long multi-step knowledge work.
You only care about the highest public coding benchmark score or need a cheaper high-volume model.
The strongest OpenAI pick for agentic coding and knowledge work. Claude Opus 4.7 still wins on the public SWE-Bench Pro coding number, but GPT-5.5 is the better OpenAI default when ecosystem, Codex, or computer-use workflows matter.
Full pricing, benchmark table and release notes on the GPT-5.5 page.
The cost-conscious pick for GPT-5.5 vs Grok 4, about 77% less per token than GPT-5.5 than the top choice while holding 92/100 on coding.
xAI's latest flagship with strong coding benchmark performance, a 2M token context window, and aggressive pricing at $2/$6 per million tokens.
You need the highest writing quality or the most reliable production-grade output — Claude wins both.
Strong coding benchmark with excellent value. The $2/$6 pricing and 2M context make it competitive with more expensive alternatives.
Full pricing, benchmark table and release notes on the Grok 4 page.
UseRightAI recommendations are based on practical decision factors people actually feel in day-to-day use.
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GPT-5.5 wins on more of the categories we score — coding, research, reasoning — so it is the better default of the two. Grok 4 is the better pick when your work is mostly coding and research at competitive pricing with maximum context. Neither is universally "better": GPT-5.5 is aimed at agentic coding and computer-use workflows, Grok 4 at coding and research at competitive pricing with maximum context.
Grok 4 is cheaper at $2/1M input and $6/1M output. GPT-5.5 costs $5/1M input and $30/1M output.
Grok 4 has the larger context window at 2M tokens vs GPT-5.5's 1M. For large document analysis, Grok 4 is the stronger pick.
GPT-5.5 is better for coding with a score of 96 vs Grok 4's 92 (out of 100). GPT-6 Astra is the overall coding leader in this directory at 100/100.
Grok 4 is faster with a fast speed rating (score: 4) vs GPT-5.5's balanced rating (score: 3). Speed matters most for interactive and high-throughput work; for batch jobs the GPT-5.5 latency penalty is usually invisible.
Claude Opus 4.7 leads GPT-5.5 on SWE-Bench Pro for pure coding ceiling. Premium API pricing makes it less attractive for high-volume low-risk work. Avoid it if you only care about the highest public coding benchmark score or need a cheaper high-volume model. That is the main case for looking at Grok 4 instead.
Claude Opus 4.6 and Sonnet 4.6 lead on pure coding benchmarks. Less established ecosystem and tooling than OpenAI or Anthropic. Avoid it if you need the highest writing quality or the most reliable production-grade output — Claude wins both. Against GPT-5.5 specifically, the gap shows up most on coding (96 vs 92).
Take a moderate workload of 10M input and 2M output tokens a month. GPT-5.5 runs $110.00 (at $5/1M in and $30/1M out); Grok 4 runs $32.00 (at $2/1M in and $6/1M out). That is a $78.00/month difference — Grok 4 is the cheaper of the two at this volume, and the gap scales linearly as you send more. Output tokens dominate the bill on both, so prompt length matters far less than response length.
Yes, and for most teams that beats picking one. A common split is GPT-5.5 for agentic coding and computer-use workflows, with Grok 4 handling coding and research at competitive pricing with maximum context. Routing high-volume, low-stakes calls to Grok 4 at $2/1M and reserving GPT-5.5 for the hard cases is usually the cheapest arrangement that does not cost you quality.