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Claude Opus 4 vs Claude Opus 5.5
Quick answerNeither model exists yet — Claude Opus 4 and Claude Opus 5.5 are not real products as of this writing. Comparing them would mean inventing specs, which we won't do. Here's a tongue-in-cheek placeholder comparison based on publicly known Claude versioning patterns.
Official Anthropic page
Does not exist
Does not exist
Context window
Unconfirmed
Unconfirmed
Benchmark scores
None published
None published
Multimodal support
Unconfirmed
Unconfirmed
Safety research published
N/A
N/A
Best available Claude (mid-2025)
Try Claude Opus 4.5 or Claude 3.7 Sonnet instead
Try Claude Opus 4.5 or Claude 3.7 Sonnet instead
Claude Opus 4
Known Pricing★☆☆☆☆
Factual Existence★☆☆☆☆
Documented Features★☆☆☆☆
Benchmarks Available★☆☆☆☆
You Can Actually Use It★☆☆☆☆
Claude Opus 5.5
Known Pricing★☆☆☆☆
Factual Existence★☆☆☆☆
Documented Features★☆☆☆☆
Benchmarks Available★☆☆☆☆
You Can Actually Use It★☆☆☆☆
Worth knowing
- As of mid-2025, Anthropic's real lineup includes models like Claude 3.5 Sonnet, Claude 3.7 Sonnet, and Claude Opus 4.5 — not Opus 4 or Opus 5.5.
- Anthropic uses a naming scheme with version number + tier (Haiku, Sonnet, Opus) — 'Opus 5.5' doesn't match any announced roadmap.
- Comparing fictional AI models is a great way to get confidently wrong information — we're not playing that game.
- If you're looking for the most powerful Claude available right now, check anthropic.com for the latest confirmed releases.
Asking an AI to compare two AI models that don't exist is delightfully recursive — it's like asking a ghost to review two haunted houses that were never built.
If you wantYou want the most capable Claude model available today
Skip this comparison entirely and visit anthropic.com — the real current flagship (e.g. Claude Opus 4.5) will serve you far better than a fictional one.
→ Pick Claude Opus 4 If you wantYou want to avoid hallucinated AI benchmarks
Neither pick wins here, but refusing to invent specs is the only honest move — check official Anthropic release notes for real data.
→ Pick Claude Opus 5.5 Some links on this page are affiliate links. If you sign up through them, we may earn a commission at no extra cost to you.