Claude Opus 4.8 wins on coding (100 vs 92) and writing quality. Grok 4 wins on price ($2 vs $5/1M input) and context window (2M vs 1M). For most workflows, Claude Opus 4.8 is the stronger default — best value premium coder — frontier-grade at half of fable 5's price.
The safest Claude Opus 4.8 vs Grok 4 default, the cheaper option worth trying first, and the specialist pick — before you read the detail below.
Claude Opus 4.8 is the strongest answer here for Claude Opus 4.8 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 73% less per token. Start here and only move up if the output is not good enough.
Grok 4 is the fastest of these for Claude Opus 4.8 vs Grok 4 — worth it when latency is what the reader notices, not the last few points of reasoning depth.
Claude Opus 4.8 leads on coding with a score of 100 vs 92 for Grok 4.
Grok 4 has the larger context window: 2M vs 1M for Claude Opus 4.8.
Grok 4 is cheaper at $2/1M input tokens vs $5/1M for Claude Opus 4.8.
Choose Claude Opus 4.8 for hardest coding tasks, parallel agentic workflows, and high-fidelity vision. Its coding and research scores are what carry the recommendation here.
Choose Grok 4 when your work is mostly coding and research at competitive pricing with maximum context — that is the workload it was tuned for.
Grok 4 is the more cost-efficient option at $2/1M input — Claude Opus 4.8 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 Claude Opus 4.8 vs Grok 4 answer changes when cost, speed, or long-document depth leads the decision.
Anthropic / Premium / Sep 3, 2026
Best value premium coder — frontier-grade at half of Fable 5's price.
Ranks models by the broadest mix of coding, writing, research, and long-context usefulness.
You need low-latency responses, image generation, or a workflow locked to OpenAI tooling.
Where the Claude Opus 4.8 vs Grok 4 recommendation shifts once you weigh price or latency differently.
Best value premium coder — frontier-grade at half of Fable 5's price.
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 |
|---|---|---|---|---|---|---|---|---|
| Claude Opus 4.8Anthropic | $5.00/1M | $25.00/1M | $100 | 1M tokens | Deliberate | 100 | 96 | 98 |
| 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 Claude Opus 4.8 vs Grok 4, what it is genuinely good at, and where we would steer you away from it.
The default answer for Claude Opus 4.8 vs Grok 4 — 100/100 on the coding axis, and the model we would start with unless the price below rules it out.
Anthropic's newest Opus flagship — 69.2% SWE-Bench Pro, 88.6% SWE-Bench Verified, 1890 Arena Elo (121 pts ahead of GPT-5.5), and native parallel subagents. Same $5/$25 price as Opus 4.7.
You need low-latency responses, image generation, or a workflow locked to OpenAI tooling.
The best value at the premium tier now that Claude Fable 5 leads on raw capability. 69.2% SWE-Bench Pro, 1890 Elo, and built-in parallel subagents at $5/$25 — half the price of Fable 5. The smart default for serious coding when you don't need the absolute frontier.
Full pricing, benchmark table and release notes on the Claude Opus 4.8 page.
Where most budgets should land for Claude Opus 4.8 vs Grok 4 — about 73% less per token than Claude Opus 4.8, and still 92/100 on the coding axis.
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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Claude Opus 4.8 wins on more of the categories we score — coding, research, long context — 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": Claude Opus 4.8 is aimed at hardest coding tasks and parallel agentic 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. Claude Opus 4.8 costs $5/1M input and $25/1M output.
Grok 4 has the larger context window at 2M tokens vs Claude Opus 4.8's 1M. For large document analysis, Grok 4 is the stronger pick.
Claude Opus 4.8 is better for coding with a score of 100 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 Claude Opus 4.8's deliberate rating (score: 2). Speed matters most for interactive and high-throughput work; for batch jobs the Claude Opus 4.8 latency penalty is usually invisible.
Deliberate pace — not the right pick for latency-sensitive applications. Same price tier as Opus 4.7; not a budget option. Avoid it if you need the highest possible coding ceiling (Fable 5 / Mythos 5), low-latency responses, or a workflow locked to OpenAI tooling. 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 Claude Opus 4.8 specifically, the gap shows up most on coding (100 vs 92).
Take a moderate workload of 10M input and 2M output tokens a month. Claude Opus 4.8 runs $100.00 (at $5/1M in and $25/1M out); Grok 4 runs $32.00 (at $2/1M in and $6/1M out). That is a $68.00/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 Claude Opus 4.8 for hardest coding tasks and parallel agentic 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 Claude Opus 4.8 for the hard cases is usually the cheapest arrangement that does not cost you quality.