Claude Mythos 5 wins on coding (100 vs 80) and writing quality. Gemini 3.1 Pro 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.
Gemini 3.1 Pro 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 80 for Gemini 3.1 Pro.
Gemini 3.1 Pro has the larger context window: 2M vs 1M for Claude Mythos 5.
Gemini 3.1 Pro 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 Gemini 3.1 Pro when research.
Gemini 3.1 Pro 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.
Best for research and deep document analysis — 2M context at the best premium 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. Gemini 3.1 Pro is the better pick when research. The right choice depends on your specific use case.
Gemini 3.1 Pro is cheaper at $2/1M input and $12/1M output. Claude Mythos 5 costs $10/1M input and $50/1M output.
Gemini 3.1 Pro has the larger context window at 2M tokens vs Claude Mythos 5's 1M. For large document analysis, Gemini 3.1 Pro is the stronger pick.
Claude Mythos 5 is better for coding with a score of 100 vs Gemini 3.1 Pro's 80 (out of 100). Claude Fable 5 is the overall coding leader in this directory at 100/100.
Gemini 3.1 Pro is faster with a balanced speed rating (score: 3) vs Claude Mythos 5's deliberate rating (score: 2).