Claude Opus 4.8 vs Grok 4.5
Anthropic Claude Opus 4.8 | SpaceXAI Grok 4.5 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | SpaceXAI |
| Release date | May 28 2026 | Jul 8 2026 |
| Access | Proprietary | Proprietary |
| Specifications | ||
Context window | 1M | — |
| 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. | 95% | — |
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. | 69.2%Best | 64.7% |
Multilingual coding SWE-Bench MultilingualLike SWE-Bench, but the coding problems span many programming languages, not just one. Tests how broadly the AI can code. Higher is better. | 84.4%Best | 78% |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | 63.8% | — |
Agentic coding DeepSWE 1.0Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. Higher is better. | 55.8% | 62%Best |
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. | 88% | — |
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. | 74.6% | 83.3%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. | 49.8% | — |
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. | 57.9% | — |
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. | 83.4% | — |
Agentic financial analysis Finance Agent v2Tests the AI on real financial-analysis work, like digging through reports and making sound decisions. Higher is better. | 53.9% | — |
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. | 1890 | — |
| Timeline | ||
| Release gap | Claude Opus 4.8 shipped 41 days before Grok 4.5 | |
Which is better: Claude Opus 4.8 or Grok 4.5?
Claude Opus 4.8 and Grok 4.5 are evenly matched across the 4 benchmarks they both report (SWE-Bench Pro, SWE-Bench Multilingual, DeepSWE 1.0, Terminal-Bench 2.1). Claude Opus 4.8 shipped 41 days before Grok 4.5, 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 SWE-Bench Pro, Claude Opus 4.8 leads at 69.2% vs Grok 4.5 at 64.7%. On SWE-Bench Multilingual, Claude Opus 4.8 leads at 84.4% vs Grok 4.5 at 78%. On DeepSWE 1.0, Grok 4.5 leads at 62% vs Claude Opus 4.8 at 55.8%. On Terminal-Bench 2.1, Grok 4.5 leads at 83.3% vs Claude Opus 4.8 at 74.6%.
Frequently asked questions
Claude Opus 4.8 was released by Anthropic on May 28 2026.
Grok 4.5 was released by SpaceXAI on Jul 8 2026.
Claude Opus 4.8 leads on SWE-Bench Pro — Claude Opus 4.8 69.2% vs Grok 4.5 64.7%.