Claude Opus 4.8 wins on price ($5 vs $10/1M input). 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 Claude Mythos 5 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 Claude Mythos 5 — pick it when quality of output matters more than the $5.00/1M/1M input you pay for it.
GPT-5.1-Codex-Max handles the same job for about 63% less per token. Start here and only move up if the output is not good enough.
Claude Mythos 5 is the fastest of these for Claude Opus 4.8 vs Claude Mythos 5 — 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 100 for Claude Mythos 5.
Claude Opus 4.8 is cheaper at $5/1M input tokens vs $10/1M for Claude Mythos 5.
Claude Opus 4.8 is the stronger default for coding tasks.
Claude Opus 4.8 is the safer default: it is built for hardest coding tasks, parallel agentic workflows, and high-fidelity vision, which covers most of what people bring to this comparison.
Claude Mythos 5 earns its place when your work is mostly frontier cybersecurity research and autonomous vulnerability discovery, even though it loses the overall count here.
Both models serve different primary workflows — Claude Opus 4.8 for hardest coding tasks and parallel agentic workflows, Claude Mythos 5 for frontier cybersecurity research and autonomous vulnerability discovery — so running each where it has a clear edge often beats forcing one to do both.
Switch the scoring lens to see whether the Claude Opus 4.8 vs Claude Mythos 5 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 Claude Mythos 5 recommendation shifts once you weigh price or latency differently.
Best value premium coder — frontier-grade at half of Fable 5's price.
The frontier ceiling — same model as Fable 5, safeguards lifted, partner-only.
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 |
| Claude Mythos 5Anthropic | $10.00/1M | $50.00/1M | $200 | 1M tokens | Deliberate | 100 | 97 | 99 |
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 Claude Mythos 5, what it is genuinely good at, and where we would steer you away from it.
Our pick for Claude Opus 4.8 vs Claude Mythos 5. 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 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.
The fastest model in this shortlist for Claude Opus 4.8 vs Claude Mythos 5. Pick it when turnaround is what your readers or users notice.
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.
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. Claude Mythos 5 is the better pick when your work is mostly frontier cybersecurity research and autonomous vulnerability discovery. Neither is universally "better": Claude Opus 4.8 is aimed at hardest coding tasks and parallel agentic workflows, Claude Mythos 5 at frontier cybersecurity research and autonomous vulnerability discovery.
Claude Opus 4.8 is cheaper at $5/1M input and $25/1M output. Claude Mythos 5 costs $10/1M input and $50/1M output.
Both Claude Opus 4.8 and Claude Mythos 5 have the same 1M context window.
Claude Opus 4.8 and Claude Mythos 5 are similarly matched on coding. GPT-6 Astra is the overall coding leader in this directory at 100/100.
Both Claude Opus 4.8 and Claude Mythos 5 have similar speed profiles — rated deliberate. Neither will be the bottleneck if latency is your deciding factor.
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 Claude Mythos 5 instead.
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. Against Claude Opus 4.8 specifically, the two are close enough on capability that price and speed decide it.
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); Claude Mythos 5 runs $200.00 (at $10/1M in and $50/1M out). That is a $100.00/month difference — Claude Opus 4.8 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 Claude Mythos 5 handling frontier cybersecurity research and autonomous vulnerability discovery. Since Claude Opus 4.8 is both the stronger and the cheaper option here, a split mainly makes sense if Claude Mythos 5 covers a capability you specifically need.