Claude Mythos 5 wins on coding (100 vs 92) and writing quality. Grok 4 wins on price ($2 vs $10/1M input) and context window (2M vs 1M). For most workflows, Claude Mythos 5 is the stronger default — superseded by mythos 5.1 — same model as fable 5, safeguards lifted, partner-only.
The safest Claude Mythos 5 vs Grok 4 default, the cheaper option worth trying first, and the specialist pick — before you read the detail below.
Claude Mythos 5 is the strongest answer here for Claude Mythos 5 vs Grok 4 — pick it when quality of output matters more than the $10.00/1M/1M input you pay for it.
Grok 4 handles the same job for about 87% 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 Mythos 5 vs Grok 4 — worth it when latency is what the reader notices, not the last few points of reasoning depth.
Claude Mythos 5 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 Mythos 5.
Grok 4 is cheaper at $2/1M input tokens vs $10/1M for Claude Mythos 5.
Go with Claude Mythos 5 if you want one model to handle coding and research — it targets frontier cybersecurity research, autonomous vulnerability discovery, and the absolute capability ceiling.
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 — Claude Mythos 5 costs 5x 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 Mythos 5 vs Grok 4 answer changes when cost, speed, or long-document depth leads the decision.
Anthropic / Premium / Sep 1, 2026
Superseded by Mythos 5.1 — same model as Fable 5, safeguards lifted, partner-only.
Ranks models by the broadest mix of coding, writing, research, and long-context usefulness.
You don't have vetted-partner access or don't need lifted safeguards — Fable 5 is the same model, generally available, at the same price.
Where the Claude Mythos 5 vs Grok 4 recommendation shifts once you weigh price or latency differently.
Superseded by Mythos 5.1 — same model as Fable 5, safeguards lifted, partner-only.
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 Mythos 5Anthropic | $10.00/1M | $50.00/1M | $200 | 1M tokens | Deliberate | 100 | 97 | 99 |
| 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 Mythos 5 vs Grok 4, what it is genuinely good at, and where we would steer you away from it.
Our pick for Claude Mythos 5 vs Grok 4. It scores 100/100 on the coding axis we weight this page by, and nothing else in this shortlist matches it on output quality.
Anthropic's most powerful frontier model — the same underlying model as Fable 5 with safeguards lifted in some areas, restricted to vetted enterprise and research partners. The capability ceiling of mid-2026.
You don't have vetted-partner access or don't need lifted safeguards — Fable 5 is the same model, generally available, at the same price.
The most capable model Anthropic has ever shipped — but access is gated to vetted partners because its safeguards are lifted in high-risk areas. For everyone else, Fable 5 is the same model at the same price with standard safety controls. Choose Mythos 5 only if you have partner access and need its security ceiling.
Full pricing, benchmark table and release notes on the Claude Mythos 5 page.
Where most budgets should land for Claude Mythos 5 vs Grok 4 — about 87% less per token than Claude Mythos 5, 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 Mythos 5 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 Mythos 5 is aimed at frontier cybersecurity research and autonomous vulnerability discovery, 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 Mythos 5 costs $10/1M input and $50/1M output.
Grok 4 has the larger context window at 2M tokens vs Claude Mythos 5's 1M. For large document analysis, Grok 4 is the stronger pick.
Claude Mythos 5 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 Mythos 5's deliberate rating (score: 2). Speed matters most for interactive and high-throughput work; for batch jobs the Claude Mythos 5 latency penalty is usually invisible.
Not generally available — limited to vetted partners after Project Glasswing's private preview. Most teams should use Fable 5, which is the same model with standard safeguards. Premium $10/$50 pricing and a deliberate, high-latency profile. Avoid it if you don't have vetted-partner access or don't need lifted safeguards — Fable 5 is the same model, generally available, at the same price. 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 Mythos 5 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 Mythos 5 runs $200.00 (at $10/1M in and $50/1M out); Grok 4 runs $32.00 (at $2/1M in and $6/1M out). That is a $168.00/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 Mythos 5 for frontier cybersecurity research and autonomous vulnerability discovery, 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 Mythos 5 for the hard cases is usually the cheapest arrangement that does not cost you quality.