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Claude · Opus 5
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Refactor this function and explain the trade-off.
Claude Opus 5 I'd split this into two pure helpers: one to validate, one to transform. The trade-off is a few extra lines for much easier testing.
function validate(input) { ... }
Now take a longer, more careful pass.
Claude Fable 5 Thinking it through with the full context window in mind, I'd also consider the error paths before committing to a shape.
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Flagship workhorse
Claude Opus 5
Released July 2026 · state-of-the-art on coding & knowledge work

Opus 5 is Anthropic's newest flagship — top scores on coding and knowledge-work benchmarks, coming close to Fable 5 at half the price. With a 1M token context window and always-on adaptive thinking, it's the best everyday Claude.

Frontier · Mythos-class
Claude Fable 5
Released June 2026 · Anthropic's most capable model

Fable 5 is the first Mythos-class Claude — Anthropic's most powerful reasoning model yet. Built for complex engineering and long-horizon agentic work, with a 1M token context window and adaptive extended thinking.

Claude Opus 5 · included
Claude Fable 5 · included
Deepseek V4
GPT-5.6
Grok 4.6
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