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Grok 4.5

Model ● Covered in 15 stories Compare ⇄ + Follow

Grok 4.5 is a coding-focused large language model released by xAI in July with 1.5 trillion parameters, positioned as a competitive alternative to Claude Opus at significantly lower cost and token usage. Recent benchmarks show it matches Claude's coding performance while using roughly 4.2 times fewer tokens at less than half the price, and it has demonstrated strong results in agent-based tasks and coding benchmarks like SWE-bench (~70%) and the Basecamp project builds. SpaceX AI has leveraged Grok 4.5 as the backbone for Grok Build, an open-sourced terminal coding agent, and the model operates at $2/$6 per million input/output tokens with throughput of 80 tokens per second.

Updated 3 August 2026

Specifications

No specifications recorded yet.

Latest developments

Are AI labs pelicanmaxxing? Simon Willison · 1 week ago · 44 "Drawing" the Mona Lisa with GPT-5.6, Claude, Gemini, and Grok TLDR Dev · 1 week ago · 49 LWiAI Podcast #252 - GPT 5.6, Grok 4.5, Nemotron-Labs-Diffusion, AI 2040 Last Week in AI · 1 week ago · 43 Agent swarms and the new model economics TLDR · 1 week ago · 33 I trust Claude for everything. This test made me rethink that. The New Stack · 2 weeks ago · 5 Musk open-sourced Grok Build to fight Anthropic. Anthropic pays him $1.25 billion a month. The New Stack · 2 weeks ago · 33
SpaceXAI Open-Sources Grok Build: The Rust Agent Harness, TUI, and Tool Layer Behind Its Coding CLI MarkTechPost · 2 weeks ago · 48 Basecamp Bench TLDR Dev · 3 weeks ago · 14

Timeline

Month Quarter Year

2026

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 · 2 sources
  • Cursor deploys this model · 1 source
  • Grok Build derived from this model · 1 source

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