From the source

Announcing Grok-1.5

Model update

xAI announces Grok-1.5, a new model with improved reasoning capabilities, a 128,000 token context window, and strong performance on math and coding benchmarks.

It will be available soon on the 𝕏 platform.

From the source
Grok-1.5 comes with improved reasoning capabilities and a context length of 128,000 tokens. Available on 𝕏 soon.
x.ai

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