Claude Sonnet 5 vs GPT-5.6 Luna
Anthropic Claude Sonnet 5 | OpenAI GPT-5.6 Luna | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Jun 30 2026 | Jun 26 2026 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
Agentic coding SWE-Bench ProCan the AI fix real bugs in real software? It's handed actual problems from open-source projects and has to write code that genuinely solves them. Higher is better. | 63.2% | — |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | 61.2% | — |
Agentic terminal coding Terminal-Bench 2.1Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | 80.4% | 82.5%Best |
Multidisciplinary reasoning Humanity's Last Exam · no toolsHumanity's Last Exam — extremely hard expert questions across many subjects, written so you can't just look up the answer. “No tools” means the AI answers on its own. Higher is better. | 43.2% | — |
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. | 57.4% | — |
Agentic computer use OSWorld-VerifiedCan the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Higher is better. | 81.2% | — |
Knowledge work GDPval-AAMeasures how well the AI does economically valuable knowledge work, judged against human experts. Shown as a rating (like a chess Elo) — higher is better. | 1618 | — |
| Timeline | ||
| Release gap | GPT-5.6 Luna shipped 4 days before Claude Sonnet 5 | |
Which is better: Claude Sonnet 5 or GPT-5.6 Luna?
GPT-5.6 Luna leads Claude Sonnet 5 on 1 of the 1 benchmark they both report (Terminal-Bench 2.1). GPT-5.6 Luna shipped 4 days before Claude Sonnet 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 Terminal-Bench 2.1, GPT-5.6 Luna leads at 82.5% vs Claude Sonnet 5 at 80.4%.
Frequently asked questions
Claude Sonnet 5 was released by Anthropic on Jun 30 2026.
GPT-5.6 Luna was released by OpenAI on Jun 26 2026.
GPT-5.6 Luna leads on Terminal-Bench 2.1 — Claude Sonnet 5 80.4% vs GPT-5.6 Luna 82.5%.
Other comparisons
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