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Grok 4.5

Model ● Covered in 18 stories + Follow

Grok 4.5 is an xAI large language model highlighted in recent coverage for its coding performance and use in long-running agent workflows. It has been used as the base model for subsequent xAI updates, including Grok 4.6—described as a post-training upgrade that extends Grok 4.5 with additional training aimed at better long-horizon behavior and higher coding benchmarks. Grok 4.5 has also been referenced in the context of agent systems and xAI’s Grok Build terminal coding agent, which uses Grok 4.5 for coding-agent tasks.

Updated 15 September 2026

Specifications

No specifications recorded yet.

Latest developments

SpaceXAI Releases Grok 4.6: A 500K-Context Frontier Model Tuned for Long-Running Agents, Coding, and Knowledge Work MarkTechPost · 1 month ago · 16
SpaceXAI releases flagship Grok 4.6 model with advanced reasoning capabilities SiliconANGLE · 1 month ago · 46
SpaceXAI trained Grok 4.6 on something most AI labs throw away The New Stack · 1 month ago · 25
Are AI labs pelicanmaxxing? Simon Willison's Weblog · 1 month ago · 48
"Drawing" the Mona Lisa with GPT-5.6, Claude, Gemini, and Grok TryAI · 1 month ago · 51 LWiAI Podcast #252 - GPT 5.6, Grok 4.5, Nemotron-Labs-Diffusion, AI 2040 Last Week in AI · 1 month ago · 46
Agent swarms and the new model economics Cursor · 1 month ago · 37
I trust Claude for everything. This test made me rethink that. The New Stack · 1 month ago · 8

Timeline

Month Quarter Year

2026

SpaceXAI (xAI) released Grok 4.6, an updated flagship large language model with supplemental post-training for long-context and long-running agent performance Model release

Study finds no evidence of AI labs optimizing models for pelican-on-bicycle image generation Research publication

Multiple AI model releases and regulatory developments across OpenAI, Anthropic, and competitors Other

xAI open-sources Grok Build coding agent and releases Grok 4.3 on Amazon Bedrock Open source release

Claude Sonnet 5 Release and Tokenizer Efficiency Comparison with Competitors Model release

xAI launches Grok 4.5, an Opus-class large language model developed in partnership with Cursor Model release

OpenAI releases GPT-5.6 in multiple variants alongside frontier AI model releases from competitors Model release

Relationships

Products & technology

  • xAI develops this model · 4 sources
  • SpaceX develops this model · 3 sources
  • SpaceXAI develops this model · 3 sources
  • Cursor deploys this model · 1 source
  • Grok Build derived from this model · 1 source
  • Grok 4.6 derived from this model · 1 source

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