Grok 4.5
xAI's latest flagship model with 500K context, reasoning capabilities, and function calling. Aliases: grok-build-latest.
Best for
Complex reasoning, agentic coding, tool use, large context tasks
Strengths
500K token context window with reasoning capabilities
Strong function calling and structured output support
Competitive pricing at $2/$6 per MTok with $0.50 cached input
Available on Starter tier — great value for advanced capabilities
When to use
Choose Grok 4.5 when you need strong reasoning and tool use at an affordable price point. Its 500K context handles large codebases, and built-in reasoning means it thinks through complex problems. Available on Starter plan — best value reasoning model.
Limitations
500K context is large but not 1M. Newer than some alternatives so fewer community examples. For the absolute largest context needs, GPT-5.6 or Gemini models offer 1M+.
Pairs well with
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