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 — the frontier ceiling — same model as fable 5, safeguards lifted, partner-only.
The shortest way to see the safest default, the lower-cost option, and the specialist pick before you read deeper.
Claude Mythos 5 is the safest overall answer here when you want the strongest default instead of the lowest list price.
Meta: Llama 3.1 8B Instruct is the lower-cost option to start with when you still need useful output at scale.
Grok 4 is the better pick when response speed matters more than maximum 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.
Choose Claude Mythos 5 for coding and research — frontier cybersecurity research.
Choose Grok 4 when coding and research at competitive pricing with maximum context.
Grok 4 is the more cost-efficient option at $2/1M — worth considering if token volume is a concern.
Switch the scoring lens to see whether the top answer changes when you care more about cost, speed, or long-document work.
Anthropic / Premium / Jun 9, 2026
The frontier ceiling — 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.
The fastest way to see where the recommendation shifts when your priority changes.
The frontier ceiling — same model as Fable 5, safeguards lifted, partner-only.
Strong coding value with 2M context — an underrated pick at this price.
80.3% SWE-Bench Pro — tied with Fable 5 as the highest public coding score of any model
Safeguards lifted in some areas for advanced security and research workloads
Excels at complex, multi-step cybersecurity tasks under partner access
Same 1M-token context and 1932 GDPval-AA score as Fable 5
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
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Claude Mythos 5 wins on more categories — coding, research, long context. Grok 4 is the better pick when coding and research at competitive pricing with maximum context. The right choice depends on your specific use case.
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). Claude Fable 5 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).