AI Provider2026-05-17

xAI

Also known as: xAI / X.AI / Grok

AI company founded by Elon Musk, developing the Grok LLM series. Differentiates through integration with X (formerly Twitter) and real-time web search capability.

Overview

Grok is notable as the only major LLM with access to X's real-time data stream. In 2026, xAI launched a voice API (TTS + STT) at 60% below competitor pricing. See xAI Grok voice API guide.

Product strategy

Grok is offered as a multimodal LLM covering text, image generation, and voice. The API uses aggressive low-cost pricing to compete with OpenAI and Anthropic in the enterprise segment.

Complete guide to xAI's Grok TTS and STT APIs, officially bundled on April 17, 2026. TTS at $4.20/1M characters and STT at $0.10/hour (batch) undercut competitors by 60%. Grok STT achieves a 5.0% entity recognition error rate — the best in the industry. Covers API usage, benchmarks, and real-world use cases.

AI API Cost Optimization in the Pay-Per-Use Era — Smart Strategies for Claude, GPT, Gemini & Local LLMs [2026]

Comprehensive guide to AI API cost optimization in the pay-per-use era. Covers Claude, GPT, Gemini pricing comparisons, 5 reduction techniques including prompt caching, batch APIs, local LLM hybrid operations, monthly cost simulations, and ROI calculation methods.

OpenAI GPT-Realtime-2 and the Three New Voice Models — A Practitioner's 2026 Look at Reasoning Voice Agents, Live Translation, and Streaming Whisper

On May 7, 2026, OpenAI released a trio of new voice models: GPT-Realtime-2 (the first voice model with GPT-5-class reasoning), GPT-Realtime-Translate (live translation across 70+ input / 13 output languages), and GPT-Realtime-Whisper (streaming speech-to-text). This article summarizes capabilities, benchmark deltas vs 1.5, pricing, when to pick which, and the upgrade decision from 1.5 — based on official information.

Grok Bot Explained: xAI's Always-On AI Agent Teammates

Grok Bot is xAI's always-on AI agent team, announced Aug 11, 2026, in beta. It runs on its own cloud computer and returns to you only when approval is needed.

GPT-5.6 (Sol / Terra / Luna) vs Grok 4.5 — API Pricing, Specs and How to Choose [July 2026]

GPT-5.6 ships in three tiers — Sol $5/$30, Terra $2.50/$15, Luna $1/$6 (input/output per 1M). xAI Grok 4.5 is $2/$6 with a 500K context and an OpenAI-compatible API. A practical comparison plus per-use-case routing, prompt caching, and reasoning-effort cost tips for SMBs. Updated July 2026.

What Is Grok Build? xAI's Official CLI Coding Agent

**[Grok Build](https://x.ai/cli)** is xAI's official CLI coding agent, **released as early beta on May 14, 2026** ([official](https://x.ai/cli) / [Changelog](https://x.ai/build/changelog) / [npaka's Japanese note write-up](https://note.com/npaka/n/nd813d073196e)). Alongside Claude Code, Codex CLI, Gemini CLI, and [agmsg](../columns/agmsg-cross-agent-messaging-cli-ai-2026-06), Grok Build is **xAI's entry in the CLI coding-agent space**. Its key differentiators are **up to 8 parallel sub-agents isolated in separate Git worktrees**, a Plan-Review-Approve workflow, **ACP (Agent Client Protocol) + MCP servers**, and **local execution** (air-gap-compatible). **Model & pricing**: - Internal model: **grok-build-0.1** (256K context, API rates **$1.00/M input, $2.00/M output**); **Composer 2.5** for SuperGrok / X Premium+ - SWE-Bench Verified **70.8%** (vendor-reported; ~17 pts behind Claude Opus 4.7 87.6% and GPT-5.5 88.7%) - Access gated to **SuperGrok Heavy ($300/mo; $99/mo introductory promo)**, SuperGrok, and X Premium+ **Install**: `curl -fsSL https://x.ai/cli/install.sh | bash`. **Integrations**: AGENTS.md / plugins / hooks / Skills / **Plugin Marketplace (MongoDB / Vercel / Sentry / Chrome DevTools / Cloudflare / Superpowers)** / Agent Dashboard / `/goal` long-running autonomous mode / headless `-P` flag for CI/CD. **Strategic context**: the February 2026 **SpaceX × xAI merger**, SpaceX's disclosed **$60B acquisition option on Cursor**, and Composer 2.5 currently training on **Colossus**, xAI's in-house supercomputer — Grok Build sits inside an unusually vertically-integrated stack. **Caveats**: roughly **15× the price** of Claude Code / Codex CLI bundles ($20/mo); ~17 pts behind on SWE-Bench Verified; no IDE integration (terminal only); flagship demos such as Arena Mode remain unshipped. Where it wins: **Git-worktree parallelism, xAI ecosystem integration, and local execution**.

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