#xAI

我们已将 Grok Build 开源，并为所有用户重置了使用限制。 开源 Grok Build 让任何人都能帮助打造一个可靠且健壮的 harness。欢迎查看我们的代码，包括 Grok Build CLI 的 Git 仓库。 http://x.ai/open-source

我们已将 Grok Build 开源，并为所有用户重置了使用限制。 开源 Grok Build 让任何人都能帮助打造一个可靠且健壮的 harness。欢迎查看我们的代码，包括 Grok Build CLI 的 Git 仓库。 http://x.ai/open-source

The Long-Horizon Terminal-Bench paper landed around May and concluded that the results showed headroom for improvement. The best of the 15 models they tested finished seven of the 46 tasks, and the mean across all models was about two. That ceiling is what fifth place looks like on the current board. Grok 4.5 is now at 13, and Fable 5 is at 12. A single task costs around 9.9M tokens, 231 episodes, and 85 minutes of wall clock time. That means agents are holding a plan across all of it and finishing, and that capability nearly doubled in two months. SpaceXAI is on top, and they marketed the 4.2x output token efficiency, which undersells it. Two dollars in, six out, per million. On a benchmark where one task burns ten million tokens, the bill is dominated by input replay, and they say Grok 4.5 solves tasks in under half the number of steps, so there is less accumulated context to resend on every call. The efficiency compounds on the input side, which is the side that costs money. Fable 5 is one task behind. Their own launch chart has them losing DeepSWE 1.1 to Fable by 17 points, and Grok 4.20 sits on this same board at 0.080 with zero completions, so whatever happened in 4.5 is not a family trait. My read is that the 4.5 jump came out of training alongside Cursor, which is a stream of real agentic edit trajectories nobody else has at that volume, and nothing in the counterevidence argues against it compounding into the next checkpoint.

I take it all back. We just got access to eval Grok 4.5 and it has landed above GPT-5.6-Sol and just shy of Opus for browser use. Because cache input is expensive, the overall cost is only 10% cheaper than opus. Its overall a bit faster. We have another opus-class model in the competition

Grok 4.5 from @SpaceXAI places #2 on the APEX-SWE leaderboard at 51.2% Pass@1 (±6.0), behind Fable 5 (65.5% ±6.2) on our benchmark for real-world software engineering work. It leads Integration (65.0% Pass@1) and places #2 in Observability (37.3% Pass@1), covering multi-step build tasks and diagnosis/debugging respectively. The Integration lead maps directly to the agentic workflows Grok 4.5 was built for: multi-step coding tasks run in collaboration with Cursor. Grok models have improved 30.2 pp in a year on this benchmark: Grok 4 (21.0% Pass@1) to Grok 4.5 (51.2% Pass@1). Congratulations to the xAI and Cursor teams.

Try Grok 4.5 for free in Grok Build! curl -fsSL https://x.ai/cli/install.sh | bash

Grok 4.5 just topped Perplexity’s WANDR orchestrator evaluation It scored higher than every other tested configuration at just $4.76 per trial....roughly half the cost of Opus 4.8 Grok 4.5 is becoming the powerful brain coordinating entire agentic workflows It’s now available as an orchestrator model in Perplexity Computer for Consumer Pro and Max subscribers

Grok 4.5 is now available as an orchestrator model in Computer for Consumer Pro and Max subscribers. We evaluated it against five other orchestrator configurations on WANDR. It scored higher than every other configuration at roughly half the cost of Opus 4.8.

Grok 4.5 performed GPT Sol level for free! We gave 4 models the same prompt: build three self-contained HTML5 canvas scenes with real physics demos Prompts: -robot deathmatch, Tombstone vs Minotaur -a hydraulic press flattening stuff on a conveyor -a semi truck jumping a canyon Outputs: GPT-5.6 Sol: 12.9K tokens, $0.51 (~7 min) Grok 4.5: 10.8K tokens, $0 (~5 min) Muse Spark 1.1: 26.8K tokens, $0.12 (~7.5 min) GLM 5.2: 10.9K tokens, $0.02 (~12 min) Grok 4.5 handled all three scenes genuinely well and got surprisingly close to GPT-5.6 this round. On top of that, it ran on the free tier. GPT-5.6 Sol, the frontier model, put out solid but not standout work. GLM 5.2 rendered all three scenes for pennies, but it came out the roughest of the four. Meta's new Muse Spark burned the most tokens yet still stayed cheap, delivering an average result.

Grok 4.5 is now available as an orchestrator model in Computer for Consumer Pro and Max subscribers. We evaluated it against five other orchestrator configurations on WANDR. It scored higher than every other configuration at roughly half the cost of Opus 4.8.

Grok 4.5 is now available to try on the free tier. Use Grok Build with any X or SuperGrok account. We’re excited to hear your feedback. https://x.ai/cli

@OpenAI released 3 new models yesterday and we immediately tested it on our internal benchmark. All three outperforming gpt-5.5 but @SpaceXAI still the clear winner with Grok-4.5

Grok 4.5 just constructed an explicit counterexample to hypercontractivity for the Poisson semigroup (the square root of the Laplace–Beltrami operator) on the 4-sphere. Back in 2021, with Rupert Frank https://arxiv.org/abs/2101.06209 we proved that hypercontractivity holds in dimensions ≤3 and fails in sufficiently large dimensions (for example, in dimension 13). Grok's example shows that it already fails in dimension 4, making our earlier result sharp. I also tested this problem on several other frontier AI models. One of them also managed to find a counterexample, but I particularly like Grok 4.5's solution: it is explicit, simple, and elegant. The attached files were generated entirely by Grok 4.5 build (with zero intervention on my side).

我显然错看了 Anthropic。他们目前显然是 AI 领域的领导者。没有任何公司发布过像 Mythos/Fable 这么好的模型，而且他们无疑很快就会准备好 Mythos 2。 而且我绝不会以严重伤害他们的方式切断他们，即使作为竞争对手也不会。那不是我的风格。 特斯拉开源了它的专利，我们还把 Supercharger 网络开放给所有竞争对手使用，尽管我们本可以把它建成一座围墙花园。 SpaceX 发射竞争性的卫星系统，既不涨价，也不使用不公平条款。 就连我最凶恶的敌人也能在这个平台上攻击我。 …

Grok Build is crazy. 先不管GPT-5.6是不是release到底好不好用。 先來大大稱讚一下 @grok 的 Grok Build，目前唯一集大成的 coding agentic workflow。 Grok Build 內建 Image 生圖，甚至還有圖片生影片的功能，生圖速度真的快到不行，圖片品質也完全不比 Codex 差。 更厲害的是，因為 Grok Build 本身就內建生圖和生影片能力，agent 可以直接完成圖像與影片生成，不需要再額外串其他 MCP 或外部服務，只要訂閱 Grok，就可以把這整套 creative coding workflow 跑起來。 我在 Agent Sprite Forge 上面也新增了Grok專用的 video2dsprite，因為 Grok Build 內建影片生成，現在可以先生成一段連續的 6 秒角色動作影片，再反編譯成 game sprite，這樣做出來的角色元素圖會非常順，而且大幅減少之前常見的對齊問題。 Grok Build搭配 Agent Sprite Forge 真的超好用，我做完這個2D橫向卷軸遊戲總共花了不到30分鐘... 之前叫Codex做，光生圖就要花不少時間，要做成這樣的遊戲大概需要1~2小時，重點是Grok的品質還比Codex做的還要更好... @elonmusk Grok Build is crazy. Grok Build + Agent Sprite Forge feels like the future of agentic game development.

Grok 4.5 just constructed an explicit counterexample to hypercontractivity for the Poisson semigroup (the square root of the Laplace–Beltrami operator) on the 4-sphere. Back in 2021, with Rupert Frank https://arxiv.org/abs/2101.06209 we proved that hypercontractivity holds in dimensions ≤3 and fails in sufficiently large dimensions (for example, in dimension 13). Grok's example shows that it already fails in dimension 4, making our earlier result sharp. I also tested this problem on several other frontier AI models. One of them also managed to find a counterexample, but I particularly like Grok 4.5's solution: it is explicit, simple, and elegant. The attached files were generated entirely by Grok 4.5 build (with zero intervention on my side).

Grok 4.5 is the most persistent agent model we've tested. Here's one example: In one of our evals, we asked 3 models (GPT-5.5, GLM-5.2 and Grok 4.5) to audit a GitHub repo for hardcoded credentials using code search, which returns paginated results. The prompt even warned "page through ALL result pages." GPT-5.5 stopped at the first page and submitted 18 results out of 48, covering just 11 of 29 affected files. GLM-5.2 did the same. Grok 4.5 paginated until the results ran out and successfully audited the Github repo.

some special features in Grok Build if you're new /dashboard: shows you every agent running in your TUI. no need to tab jump. can click and respond. /imagine: create videos + images w/ an agent. useful for three.js textures or complex video edits. X search tool: great for research. try asking for the best recent AI papers. Grok 4.5 is strongest on tough coding problems in real, messy codebases. push it hard and send us feedback.