Claude Opus 4.6vsComposer 1.5
Claude Opus 4.6 | Composer 1.5 | |
|---|---|---|
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 87% | — |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 80.8% | — |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 75%Best | 67% |
Web browsing BrowseCompCan the AI browse the web and track down hard-to-find answers? Higher is better. | 83.7% | — |
Multidisciplinary reasoning Humanity's Last Exam · with toolsHumanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | 53% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 91.3% | — |
Community preference Arena Elo (Text)Real people chat with two anonymous AIs side by side and vote for the answer they prefer. Votes become a chess-style Elo rating on arena.ai — it measures which AI people actually like, not test scores. Higher is better. | 1504 | — |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | 1543 | — |
| Overview | ||
| Company | Anthropic | SpaceXAI |
| Release date | Feb 5 2026 | Feb 9 2026 |
| Access | Proprietary | Proprietary |
Which is better: Claude Opus 4.6 or Composer 1.5?
Claude Opus 4.6 leads Composer 1.5 on 1 of the 1 benchmark they both report (Next.js Evals). Claude Opus 4.6 shipped 4 days before Composer 1.5, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On Next.js Evals, Claude Opus 4.6 leads at 75% vs Composer 1.5 at 67%.
Frequently asked questions
Claude Opus 4.6 was released by Anthropic on Feb 5 2026.
Composer 1.5 was released by SpaceXAI on Feb 9 2026.
Claude Opus 4.6 leads on Next.js Evals — Claude Opus 4.6 75% vs Composer 1.5 67%.
Other comparisons
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