Grok

Releases

1. Sep 15

   Grok 4.7 · 2.1T

2. Aug 12

   Grok 4.6

3. Jul 29

   Grok Voice Think Fast 2.0

4. Jul 8

   Grok 4.5

5. Apr 23

   Grok Voice Think Fast 1.0

Trends

• Voice AI splits into commodity APIs and reasoning-grade agents
• Frontier capability gets cheaper with every release
• Agent benchmarks expose reliability gaps and lose trust

Items

1. Sep 21

   xAI's Grok 4.7

   The repeatedly delayed ~2.1T-parameter model shipped at Grok 4.6 pricing ($2/$6 per 1M tokens, 500K context), which xAI ranks third behind Anthropic and OpenAI for agentic coding.

2. Sep 15

   xAI delays Grok 4.7

   Elon Musk said the roughly 2.1T-parameter model, originally slated for around September 12, was held back after reinforcement learning over-penalized answer length and made it stop early without verifying its work, with release now targeted for late September.

3. Aug 12

   xAI's Grok 4.6

   A post-training upgrade on Grok 4.5 tuned for long-running agents, with a 500K-token context, a new xhigh reasoning-effort level, and $2/$6 per 1M-token pricing across Cursor, Grok Build, and the API.

4. Jul 29

   xAI's Grok Voice Think Fast 2.0

   A next-generation speech-to-speech model with gains in speech reasoning, transcription accuracy, and tool-use reliability, priced at $0.08 per minute of audio and set to become the default grok-voice-latest model.

5. Jul 8

   xAI's Grok 4.5

   The lab's strongest model, co-trained with Cursor on tens of thousands of Nvidia GB300 GPUs, serves ~80 tokens/sec at $2/$6 per million tokens and resolves 64.7% of SWE-Bench Pro with roughly 4.2x fewer output tokens than Opus 4.8.

6. Jun 3

   Grok becomes Vapi's default voice

   Grok becomes the default text-to-speech engine for Vapi's 12 core voices across the platform's 2.5M+ voice agents, with Grok speech-to-text and custom voice cloning exposed through the Grok Voice API.

7. May 6

   xAI adds Grok Connectors and custom voices

   xAI added deep app integrations to Grok Web, a higher-realism Grok Imagine Quality Mode API, and Custom Voices with a Voice Library for cloning brand voices from short recordings.

8. Apr 23

   xAI's Grok Voice Think Fast 1.0 API

   xAI's most capable voice agent became available through the API with multilingual support and simple per-usage pricing, completing its programmable voice surface alongside the speech-to-text and text-to-speech APIs.

9. Apr 17

   xAI's Grok Speech-to-Text API

   Generally available alongside the existing TTS API, completing xAI's voice stack: speech-to-text covers 25 languages at $0.10/hr batch and $0.20/hr streaming, and text-to-speech costs $4.20 per 1M characters across five voices.