o3 vs Grok 4.5
OpenAI o3 | SpaceXAI Grok 4.5 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Apr 16 2025 | Jul 8 2026 |
| Access | Proprietary | Proprietary |
| 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. | 26% | — |
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. | — | 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. | — | 78% |
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. | — | 62% |
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. | — | 83.3% |
| Timeline | ||
| Release gap | o3 shipped 448 days before Grok 4.5 | |
Which is better: o3 or Grok 4.5?
o3 and Grok 4.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o3 shipped 448 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.
Direct benchmark comparisons are unavailable — o3 and Grok 4.5 don't publish scores on any of the same benchmarks.
Frequently asked questions
o3 was released by OpenAI on Apr 16 2025.
Grok 4.5 was released by SpaceXAI on Jul 8 2026.